Abstract
This chapter deals with polypropylene foams and consist out of 3 parts. Firstly—for a better understanding—the basics of foaming are described. This includes the fundamental physical processes of diffusion, nucleation and cell growth. Furthermore, material properties which are relevant for foaming are explained and typical blowing agents (physical and chemical) are introduced. Secondly, the foaming processes for polypropylene are summarized, beginning with the so-called batch foaming which is mostly relevant for scientific research. More industrial relevant processes for foaming PP are foam extrusion, foam injection molding (FIM) and bead foaming. With FIM light-weight parts with good mechanical properties can be produced. This can be achieved with physical and chemical blowing agents and with different methods. Bead foams possess a very low density and can be directly brought into relative complex shapes. Therefore, expanded Polypropylene (EPP) is maybe the most important PP foam at all. Both methods for bead foam production (discontinuous with autoclave and continuous with extrusion process) are described as well as the fusion processe (steam chest molding). The last part of this chapter is designated to the many additives that are used in PP foams (i.e. talc, clay etc.) and their influence on properties like expansion behavior and foam morphology.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Europa K (2015) Marktstudie Kunststoffe - Europa Einleitung Deutschland produziert am meisten Kunststoffe in Europa Wichtigste Absatzmärkte für Kunststoffe. 12–15
Smithers Rapra (2014) The future of polymer foams to 2019. 110
PlasticsEurope (2015) Plastics—the facts 2014/2015: an analysis of European plastics production, demand and waste data. PlasticsEurope 1–34. https://doi.org/10.1016/j.marpolbul.2013.01.015
Altstädt V, Mantey A (2010) Thermoplast- Schaumspritzgießen. Carl Hanser Verlag, München
Nallagundla Venkata Reddy, Rakesh Lingam JC (2015) Handbook of manufacturing engineering and technology. Springer, London
Raps D, Hossieny N, Park CB, Altstädt V (2015) Past and present developments in polymer bead foams and bead foaming technology. Polym (United Kingdom) 56:5–19. https://doi.org/10.1016/j.polymer.2014.10.078
Eaves D (2004) Handbook of polymer foams. Rapra Technology
Viot P, Plougonven E, Bernard D (2008) Microtomography on polypropylene foam under dynamic loading: 3D analysis of bead morphology evolution. Compos Part A Appl Sci Manuf 39:1266–1281. https://doi.org/10.1016/j.compositesa.2007.11.014
Ramesh NS, Malwitz N (1996) Bubble growth dynamics in olefinic foams. Polym Prepr 37:783–784
Gendron R, Daigneault LE (2003) Continuous extrusion of microcellular polycarbonate. Polym Eng Sci 43:1361–1377. https://doi.org/10.1002/pen.10116
Li P, Chung TS, Paul DR (2014) Temperature dependence of gas sorption and permeation in PIM-1. J Memb Sci 450:380–388. https://doi.org/10.1016/j.memsci.2013.09.030
Baldwin DF (1994) Microccellular polymer processing and the design of a continuous sheet processing system. Ph.D. thesis
Shutov F (1983) Foamed polymers. cellular structure and properties. Adv Polym Sci 51:155–218. https://doi.org/10.1007/BFb0017587
Mills NJ (1993) Handbook of polymeric foams and foam technology. Polymer (Guildf) 34:2237. https://doi.org/10.1016/0032-3861(93)90758-3
Okolieocha C, Raps D, Subramaniam K, Altstädt V (2015) Microcellular to nanocellular polymer foams: progress (2004–2015) and future directions—a review. Eur Polym J 73:500–519. https://doi.org/10.1016/j.eurpolymj.2015.11.001
Schellenberg J, Wallis M (2010) Dependence of thermal properties of expandable polystyrene particle foam on cell size and density. J Cell Plast 46:209–222. https://doi.org/10.1177/0021955X09350803
Chen Y, Das R, Battley M (2015) Effects of cell size and cell wall thickness variations on the stiffness of closed-cell foams. Int J Solids Struct 52:150–164. https://doi.org/10.1016/j.ijsolstr.2014.09.022
Ashby MF, Medalist RFM (1983) The mechanical properties of cellular solids. Metall Trans A 14:1755–1769. https://doi.org/10.1007/BF02645546
J.E. Martini, F.A. Waldman NPS (1982) The production and analysis of microcellular thermoplastic foams. SPE ANTEC Technical Paper 43:674–676
Doroudiani S, Park MTK (1998) Processing and characterization of microcellular foamed high density polyethylene/isotactic polypropylene blends. Polym Eng Sci 1205–1215
Doroudiani S, Kortschot MT (2003) Polystyrene foams: III. structure-tensile properties relationships. J Appl Polym Sci 90:1427–1434. https://doi.org/10.1002/app.12805
Rachtanapun P, Selke SEM, Matuana LM (2004) Relationship between cell morphology and impact strength of microcellular foamed high-density polyethylene/polypropylene blends. Polym Eng Sci 44:1551–1560. https://doi.org/10.1002/pen.20152
Ferkl P, Pokorný R, Bobák M, Kosek J (2013) Heat transfer in one-dimensional micro- and nano-cellular. Chem Eng Sci 97:50–58
Köppl T, Raps D, Altstädt V (2014) E-PBT—bead foaming of poly(butylene terephthalate) by underwater pelletizing. J Cell Plast 50:475–487. https://doi.org/10.1177/0021955X14528524
Spitael P, Macosko CW (2004) Strain hardening in polypropylenes and its role in extrusion foaming. Polym Eng Sci 44:2090–2100. https://doi.org/10.1002/pen.20214
Borealis (2010) Daploy WB140HMS Daploy WB140HMS
Stadler FJ, Piel C, Klimke K et al (2006) Influence of type and content of various comonomers on long-chain branching of ethene/α-olefin copolymers. Macromolecules 39:1474–1482. https://doi.org/10.1021/ma0514018
Stadler FJ, Nishioka A, Stange J et al (2007) Comparison of the elongational behavior of various polyolefins in uniaxial and equibiaxial flows. Rheol Acta 46:1003–1012. https://doi.org/10.1007/s00397-007-0190-y
Hasan MM, Li YG, Li G et al (2010) Determination of solubilities of CO2 in linear and branched polypropylene using a magnetic suspension balance and a PVT apparatus. J Chem Eng Data 55:4885–4895. https://doi.org/10.1021/je100488v
Li YG, Park CB (2009) Effects of branching on the pressure–volume–temperature behaviors of PP/CO2 solutions. Ind Eng Chem Res 48:6633–6640. https://doi.org/10.1021/ie8015279
Ferri D, Lomellini P (1999) Melt rheology of randomly branched polystyrenes. J Rheol J Rheol J Rheol 43:1272–1355. https://doi.org/10.1122/1.4966040
Venkatraman S, Okano M (1990) Polymer melts : the Cox-Merz rule revisited. Polym Eng Sci 30:308–313. https://doi.org/10.1002/pen.760300508
McCallum TJ, Kontopoulou M, Park CB et al (2007) The rheological and physical properties of linear and branched polypropylene blends. Polym Eng Sci 47:1133–1140. https://doi.org/10.1002/pen.20798
Münstedt H (2011) Rheological properties and molecular structure of polymer melts. Soft Matter 7:2273–2283. https://doi.org/10.1039/C0SM00891E
Brinson HF, Brinson LC (2008) Polymer engineering science and viscoelasticity. Springer, US, Boston, MA
Carella JM, Gotro JT, Graessley WW (1986) Thermorheological effects of long-chain branching in entangled polymer melts. Macromolecules 19:659–667. https://doi.org/10.1021/ma00157a031
Malmberg A, Liimatta J, Lehtinen A, Löfgren B (1999) Characteristics of long chain branching in ethene polymerization with single site catalysts. Macromolecules 32:6687–6696. https://doi.org/10.1021/ma9907136
Wood-Adams P, Costeux S (2001) Thermorheological behavior of polyethylene: effects of microstructure and long chain branching. Macromolecules 34:6281–6290. https://doi.org/10.1021/ma0017034
Raps D, Köppl T, Heymann L, Altstädt V (2017) Rheological behaviour of a high-melt-strength polypropylene at elevated pressure and gas loading for foaming purposes. Rheol Acta 56:95–111. https://doi.org/10.1007/s00397-016-0988-6
Watanabe K, Suzuki T, Masubuchi Y et al (2003) Crystallization kinetics of polypropylene under high pressure and steady shear flow. Polymer (Guildf) 44:5843–5849. https://doi.org/10.1016/S0032-3861(03)00604-9
Doroudiani S, Park CB (1996) Effect of the crystallinity and morphology on the microcellular foam structure of semicrystalline polymers. Polym Eng Sci Sci 36:2645–2662
Kardos JL, Christiansen AW, Baer E (1966) Structure of pressure-crystallized polypropylene. J Polym Sci Part A-2 Polym Phys 4:777–788. https://doi.org/10.1002/pol.1966.160040509
Brückner S, Phillips PJ, Mezghani K, Meille SV (1997) On the crystallization of γ-isotactic polypropylene: a high pressure study. Macromol Rapid Commun 18:1–7. https://doi.org/10.1002/marc.1997.030180101
La Carrubba V, Brucato V, Piccarolo S (2004) The use of master curves to describe the simultaneous effect of cooling rate and pressure on polymer crystallization. Polym Int 53:61–68. https://doi.org/10.1002/pi.1404
Naguib HE, Park CB, Song SW (2005) Effect of supercritical gas on crystallization of linear and branched polypropylene resins with foaming additives. Ind Eng Chem Res 44:6685–6691. https://doi.org/10.1021/ie0489608
Liao R, Yu W, Zhou C et al (2008) The formation of γ-crystal in long-chain branched polypropylene under supercritical carbon dioxide. J Polym Sci Part B: Polym Phys 46:441–451. https://doi.org/10.1002/polb.21372
Yuan M, Turng LS (2005) Microstructure and mechanical properties of microcellular injection molded polyamide-6 nanocomposites. Polymer (Guildf) 46:7273–7292. https://doi.org/10.1016/j.polymer.2005.06.054
Takada M, Tanigaki M, Ohshima M (2001) Effects of CO2 on crystallization kinetics of polypropylene. Polym Eng Sci 41:1938–1946. https://doi.org/10.1002/pen.10890
Takada M, Ohshima M (2003) Effect of CO2 on crystallization kinetics of poly(ethylene terephthalate). Polym Eng Sci 43:479–489. https://doi.org/10.1002/pen.10039
Oda T, Saito H (2004) Exclusion effect of carbon dioxide on the crystallization of polypropylene. J Polym Sci Part B: Polym Phys 42:1565–1572. https://doi.org/10.1002/polb.20076
Xu ZM, Jiang XL, Liu T et al (2007) Foaming of polypropylene with supercritical carbon dioxide. J Supercrit Fluids 41:299–310. https://doi.org/10.1016/j.supflu.2006.09.007
Li G, Wang J, Park CB, Altstädt V (2007) Solubility measurements of N2 and CO2 in polypropylene and ethene/octene copolymer. J Apllied Polym Sci 103:2945–2953
Jiang XL, Liu T, Xu ZM et al (2009) Effects of crystal structure on the foaming of isotactic polypropylene using supercritical carbon dioxide as a foaming agent. J Supercrit Fluids 48:167–175. https://doi.org/10.1016/j.supflu.2008.10.006
Naguib HE, Park CB, Lee PC (2003) Effect of talc content on the volume expansion ratio of extruded PP Foams. J Cell Plast 39:499–511. https://doi.org/10.1177/002195503039247
Colton JS, Suh NP (1987) Nucleation of microcellular foam: theory and practice. Polym Eng Sci 27:500–503. https://doi.org/10.1002/pen.760270704
Reverchon E, Cardea S (2007) Production of controlled polymeric foams by supercritical CO2. J Supercrit Fluids 40:144–152. https://doi.org/10.1016/j.supflu.2006.04.013
Lee ST (2000) Foam extrusion. CRC Press LLC, Boca Raton
Parrish RG (1972) Microcellular Foam Sheet. 13
Yu L, Zhu Q, Yu T (2013) Development and application of expanded polypropylene foam. J Wuhan Univ Technol Mater Sci Ed 28:373–379. https://doi.org/10.1007/s11595-013-0698-1
Nam GJ, Yoo JH, Lee JW (2005) Effect of long-chain branches of polypropylene on rheological properties and foam-extrusion performances. J Appl Polym Sci 96:1793–1800. https://doi.org/10.1002/app.21619
Naguib HE, Park CB, Reichelt N (2004) Fundamental foaming mechanisms governing the volume expansion of extrudedpolypropylene foams. J Appl Polym Sci 91:2661–2668. https://doi.org/10.1002/app.13448
Burt JG (1979) The elements of expansion of thermoplastics: part II. J Cell Plast 15:158–162. https://doi.org/10.1177/0021955X7901500305
Mohebbi A, Mighri F, Ajji A, Rodrigue D (2015) Current issues and challenges in polypropylene foaming: a review. Cell Polym 34:299–337
Kaewmesri W (2006) Effects of CO2 and talc contents on foaming behavior of recyclable high-melt-strength PP. J Cell Plast 42:405–428. https://doi.org/10.1177/0021955X06066995
Chaudhary AK, Jayaraman K (2011) Extrusion of linear polypropylene-clay nanocomposite foams. Polym Eng Sci 51:1749–1756. https://doi.org/10.1002/pen.21961
Zhai W, Kuboki T, Wang L et al (2010) Cell structure evolution and the crystallization behavior of polypropylene/clay nanocomposites foams blown in continuous extrusion. Ind Eng Chem Res 49:9834–9845
Zheng WG, Lee YH, Park CB (2010) Use of nanoparticles for improving the foaming behaviors of linear PP. J Appl Polym Sci 21. https://doi.org/10.1002/app.32253
Lee SH, Zhang Y, Kontopoulou M et al (2011) Optimization of dispersion of nanosilica particles in a PP matrix and their effect on foaming. Int Polym Process 26:388–398. https://doi.org/10.3139/217.2403
Nofar M, Majithiya K, Kuboki T, Park CB (2012) The foamability of low-melt-strength linear polypropylene with nanoclay and coupling agent. J Cell Plast 48:271–287. https://doi.org/10.1177/0021955X12440271
Lee ST, Ramesh NS (2005) Thermoplastic foam processing principles and development. CRC Press LLC, Boca Raton
Park CB, Cheung LK (1997) A study of cell nucleation in the extrusion of polypropylene foams. Polym Eng Sci 37:1–10. https://doi.org/10.1002/pen.11639
Behravesh AH, Park CB, Cheung LK, Venter RD (1996) Extrusion of polypropylene foams with hydrocerol and lsopentane. J Vinyl Addit Technol 2:349–357
Tabatabaei A, Barzegari MR, Mark LH, Park CB (2017) Visualization of polypropylene’s strain-induced crystallization under the influence of supercritical CO2 in extrusion. Polymer (United Kingdom) 122:312–322. https://doi.org/10.1016/j.polymer.2017.06.052
Hasan MM, Li YG, Li G et al (2010) Determination of solubilities of CO2 in linear and branched polypropylene using a magnetic suspension balance and a PVT apparatus. J Chem Eng Data 55:4885–4895. https://doi.org/10.1021/je100488v
Xu Z, Xue P, Zhu F, He J (2005) Effects of formulations and processing parameters on foam morphologies in the direct extrusion foaming of polypropylene using a single-screw extruder. J Cell Plast 41:169–185. https://doi.org/10.1177/0021955X05051740
Zhai W, Kim YW, Park CB (2010) Steam-chest molding of expanded polypropylene foams. 1. DSC simulation of bead foam processing. Ind Eng Chem Res 49:9822–9829. https://doi.org/10.1021/ie101085s
Klempner D, Frisch K (2004) Handbook of polymeric foams and foam technology. Hanser, München
Wörthwein H (2014) Method for the manufacture of EPP moulded parts. 1:1–10
BASF SE (2017) Neopolen P—designed for new ideas. Prod Broch
Market 2015–2019 (2015) Global expanded polypropylene (EPP) foam (low density, high density & porous PP)
Kuninori H, Shimada H (1983) Pre-foamed particles of polypropylene resin and process for production thereof (US Patent US 4379859). 1–4
Nofar M, Guo Y, Park CB (2013) Double crystal melting peak generation for expanded polypropylene bead foam manufacturing. Ind Eng Chem Res 52:2297–2303. https://doi.org/10.1021/ie302625e
Guo P, Liu Y, Xu Y et al (2014) Effects of saturation temperature/pressure on melting behavior and cell structure of expanded polypropylene bead. J Cell Plast 50:321–335. https://doi.org/10.1177/0021955X14525798
Lan X, Zhai W, Zheng W (2013) Critical effects of polyethylene addition on the autoclave foaming behavior of polypropylene and the melting behavior of polypropylene foams blown with n-pentane and CO2. Ind Eng Chem Res 52:5655–5665. https://doi.org/10.1021/ie302899m
Tang L, Zhai W, Zheng W (2011) Autoclave preparation of expanded polypropylene/poly(lactic acid) blend bead foams with a batch foaming process. J Cell Plast 47:429–446. https://doi.org/10.1177/0021955X11406004
Harrison IR (1985) Modelling ‘melting’ in macromolecules. Polymer (Guildf) 26:3–7. https://doi.org/10.1016/0032-3861(85)90050-3
Samuels RJ (1975) Quantitative structural characterization of the melting behavior of isotactic polypropylene. J Polym Sci Polym Phys Ed 13:1417–1446. https://doi.org/10.1002/pol.1975.180130713
Padden FJ, Keith HD (1959) Spherulitic crystallization in polypropylene. J Appl Phys 30:1479–1484. https://doi.org/10.1063/1.1734985
Pae KD (1968) Solid-solid transition of isotactic polypropylene. Polymer (Guildf) 6:657–663. https://doi.org/10.1002/pol.1968.160060401
Zhang R, Luo X, Wang Q, Ma D (1994) Melting behavior of low ethylene content polypropylene copolymers with and without nucleating agents. Chin J Polym Sci 12:246–255
Hingmann R, Rieger J, Kersting M (1995) hingmann_1995.pdf. Macromolecules 28:3801–3806
Choi JB, Chung MJ, Yoon JS (2005) Formation of double melting peak of poly(propylene-co-ethylene-co-1-butene) during the preexpansion process for production of expanded polypropylene. Ind Eng Chem Res 44:2776–2780. https://doi.org/10.1021/ie0401399
Cho K, Li F, Choi J (1999) Crystallization and melting behavior of polypropylene and maleated polypropylene blends. Polymer (Guildf) 40:1719–1729. https://doi.org/10.1016/S0032-3861(98)00404-2
Nofar M, Ameli A, Park CB (2015) Development of polylactide bead foams with double crystal melting peaks. Polymer (Guildf) 69:83–94. https://doi.org/10.1016/j.polymer.2015.05.048
Li G, Wang J, Park CB, Simha R (2007) Measurement of gas solubility in linear/branched PP melts. J Polym Sci Part B: Polym Phys 45:2497–2508. https://doi.org/10.1002/polb.21229
Stastny F, Gaeth R, Trieschmann HGD (1971) Process of making particulate expanded olefin polymers having high thermal stability. 59–61
Köppl T, Raps D, Altstädt V (2014) E-PBT—bead foaming of poly(butylene terephthalate) by underwater pelletizing. J Cell Plast 50:475–487. https://doi.org/10.1177/0021955X14528524
Kurtz GmbH (2017) Technical information EPP pre-expansion. 30
BASF SE (2017) Neopolen P—Technical Information. 1–10
Yang F, Pitchumani R (2002) Healing of thermoplastic polymers at an interface under nonisothermal conditions. Macromolecules 35:3213–3224. https://doi.org/10.1021/ma010858o
Wool RP, Yuan B-L, McGarel OJ (1989) Welding of polymer interfaces. Polym Eng Sci 29:1340–1367. https://doi.org/10.1002/pen.760291906
Anand JN, Kabam HJ (1969) Interfacial contact and bonding in autohesion: I—contact theory. J Adhes 1:16–23. https://doi.org/10.1080/00218466908077369
Anand JN, Balwinski RZ (1969) Interfacial contact and bonding in autohesion: II—intermolecular forces. J Adhes 1:24–30. https://doi.org/10.1080/00218466908077370
Anand JN (1969) Interfacial contact and bonding in autohesion: III—parallel plate attraction. J Adhes 1:31–37. https://doi.org/10.1080/00218466908077371
Anand JN, Dipzinski L (1970) Interfacial contact and bonding in autohesion: IV—experimental verification of theory. J Adhes 2:16–22. https://doi.org/10.1080/0021846708544575
Anand JN (1970) Interfacial contact and bonding in autohesion: V—bonding of “flat” surfaces. J Adhes 2:23–28. https://doi.org/10.1080/0021846708544576
De Gennes PG (1976) Dynamics of entangled polymer solutions. I. The Rouse model. Macromolecules 9:587–593. https://doi.org/10.1021/ma60052a011
De Gennes PG (1976) Dynamics of Entangled polymer solutions. II. Inclusion of hydrodynamic interactions. Macromolecules 9:594–598. https://doi.org/10.1021/ma60052a012
Bousmina M, Qiu H, Grmela M, Klemberg-Sapieha JE (1998) Diffusion at polymer/polymer interfaces probed by rheological tools. Macromolecules 31:8273–8280. https://doi.org/10.1021/ma980562r
Zhai W, Kim YW, Jung DW, Park CB (2011) Steam-chest molding of expanded polypropylene foams. 2. Mechanism of interbead bonding. Ind Eng Chem Res 50:5523–5531. https://doi.org/10.1021/ie101753w
Guanghong H, Yue W (2012) Microcellular foam injection molding process. Some crit issues inject molding. https://doi.org/10.5772/34513
Volpe V Foam injection molding with physical blowing agents
Ruckdäschel H (2008) Micro- and nanostructured polymer blends—processing, properties and foaming behaviour
Shaayegan V, Wang G, Park CB (2016) Effect of foam processing parameters on bubble nucleation and growth dynamics in high-pressure foam injection molding. Chem Eng Sci 155:27–37. https://doi.org/10.1016/j.ces.2016.07.040
Reza M (2009) Structure-flexural modulus relationships in polymeric structural
Kramschuster A, Cavitt R, Ermer D et al (2006) Effect of processing conditions on shrinkage and warpage and morphology of injection moulded parts using microcellular injection moulding. Plast Rubber Compos 35:198–209. https://doi.org/10.1179/174328906X128199
Zhang L, Zhao G, Dong G et al (2015) Bubble morphological evolution and surface defect formation mechanism in the microcellular foam injection molding process. RSC Adv 5:70032–70050. https://doi.org/10.1039/C5RA07512B
Wu PC, Jones G et al (2007) Novel microporous films and their composites. J Eng Fiber Fabr 2:49–59
Arora P, Zhang Z (2004) Battery separators. Chem Rev 104:4419–4462. https://doi.org/10.1021/cr020738u
Bai H, Wang Y, Zhang Z et al (2009) Influence of annealing on microstructure and mechanical properties of isotactic polypropylene with β-phase nucleating agent. Macromolecules 42:6647–6655. https://doi.org/10.1021/ma9001269
Tordjeman P, Robert C, Marin G, Gerard P (2001) The effect of α, β crystalline structure on the mechanical properties of polypropylene. Eur Phys J E 4:459–465
Varga J, Karger-kocsis J (1993) The occurence of transcrystallization or row-nucleated cylindritic crystallization as a result of shearing in a glass-fiber-reinforced polypropylene. Compos Sci Technol 48:191–198
Crissman JM (1969) Mechanical relaxation in polypropylene as a function of polymorphism and degree of lamella orientation. J Polym Sci 7:389–404
Varga J (2002) Β-modification of isotactic polypropylene: preparation, structure, processing, properties, and application. J Macromol Sci Part B 41:1121–1171. https://doi.org/10.1081/MB-120013089
Kersch M, Schmidt HW, Altstädt V (2016) Influence of different beta-nucleating agents on the morphology of isotactic polypropylene and their toughening effectiveness. Polymer (United Kingdom) 98:320–326. https://doi.org/10.1016/j.polymer.2016.06.051
Jacoby P (2014) Beta nucleation of polypropylene—properties, technology and applications. Elsevier, Amsterdam
Silverstein MS (2014) PolyHIPEs: recent advances in emulsion-templated porous polymers. Prog Polym Sci 39:199–234. https://doi.org/10.1016/j.progpolymsci.2013.07.003
Nguyen TH, Vayer M, Sinturel C (2018) PS-b-PMMA/PLA blends for nanoporous templates with hierarchical and tunable pore size. Appl Surf Sci 427:464–470. https://doi.org/10.1016/j.apsusc.2017.08.160
Silverstein MS (2014) Emulsion-templated porous polymers: a retrospective perspective. Polymer (Guildf) 55:304–320
Sergienko AY, Tai H, Narkis M, Silverstein MS (2002) Polymerized high internal-phase emulsions: properties and interaction with water. J Appl Polym Sci 84:2018–2027. https://doi.org/10.1002/app.10555
Wang K, Wu F, Zhai W, Zheng W (2013) Effect of polytetrafluoroethylene on the foaming behaviors of linear polypropylene in continuous extrusion. J Appl Polym Sci 129:2226–2253
Scheve BJ, Mayfield JW, DeNicola JAJ (1972) US Patent 3
Zhang ZJ, Wan D, Xing HP et al (2012) A new grafting monomer for synthesizing long chain branched polypropylene through melt radical reaction. Polymer (Guildf) 53
Lin W, Shao Z, Jy D, Chung TCM (2009) Cross-linked polypropylene prepared by PP copolymers containing flexible styrene groups. Macromolecules 42:3750–3754
Schöne J, Kotter I, Grellmann W (2012) Zeitschrift Kunststofftechnik. J Plast Technol 8:231–251
Blomenhofer M, Ganzleben S, Hanft D et al (2005) “Designer” nucleating agents for polypropylene. Macromolecules 38:3688–3695. https://doi.org/10.1021/ma0473317
Huang H-X, Wang J-K (2007) Improving polypropylene microcellular foaming through blending and the addition of nano-calcium carbonate. J Appl Polym Sci 106:505–513. https://doi.org/10.1002/app.26483
Naiki M, Fukui Y, Matsumura T et al (2001) Effect of talc on the crystallization of isotactic polypropylene. J Appl Polym Sci 79:1693–1703. https://doi.org/10.1002/1097-4628(20010228)79:9%3c1693:AID-APP190%3e3.0.CO;2-P
Okamoto M, Nam PH, Maiti P et al (2001) Biaxial flow-induced alignment of silicate layers in polypropylene/clay nanocomposite foam. Nano Lett 1:503–505. https://doi.org/10.1021/nl010051+
Jiang X-L, Bao J-B, Liu T et al (2009) Microcellular foaming of polypropylene/clay nanocomposites with supercritical carbon dioxide. J Cell Plast 45:515–538. https://doi.org/10.1177/0021955X09339470
Antunes M, Gedler G, Velasco JI (2013) Multifunctional nanocomposite foams based on polypropylene with carbon nanofillers. J Cell Plast 49:259–279. https://doi.org/10.1177/0021955X13477433
Wang C, Ying S, Xiao Z (2013) Preparation of short carbon fiber/polypropylene fine-celled foams in supercritical CO2. J Cell Plast 49:65–82. https://doi.org/10.1177/0021955X12459642
Barboza ACRN, De Paoli M (2002) Polipropileno Carregado com Microesferas Ocas de Vidro (Glass BubblesTM): Obtenção de Espuma Sintética. Polímeros 12:130–137. https://doi.org/10.1590/S0104-14282002000200013
Ss H, Hsu PP (2013) Effects of silica particle size on the structure and properties of polypropylene/silica composites foams. J Ind Eng Chem 19:1377–1383
Colton JS (1989) The nucleation of microcellular foams in semi-crystalline thermoplastics. Mater Manuf Process 4:253–262. https://doi.org/10.1080/10426918908956288
Bertrand J-N (1986) Expanded polypropylene films and process for preparing them. EP 0 178 282 A2
Libster D, Aserin A, Garti N (2007) Advanced nucleating agents for polypropylene. Polym Adv Technol 18:685–695. https://doi.org/10.1002/pat.970
Varga J, Menyhárd A (2007) Effect of solubility and nucleating duality of N,N′-dicyclohexyl-2,6-naphthalenedicarboxamide on the supermolecular structure of isotactic polypropylene. Macromol Theory Simulations 40:2422–2431
Stumpf M, Spörrer A, Schmidt H-W, Altstädt V (2011) Influence of supramolecular additives on foam morphology of injection-molded i-PP. J Cell Plast 47:519–534. https://doi.org/10.1177/0021955X11408769
Mörl M, Steinlein C, Kreger K et al (2017) Improved compression properties of polypropylene extrusion foams by supramolecular additives. J Cell Plast. https://doi.org/10.1177/0021955X17695096
Acknowledgements
For their contribution to this chapter the following people are acknowledged (in alphabetic order): Merve Aksit, Christian Bethke, Dominic Dörr, Katharina Krause, Michaela Mörl, Daniel Raps, Nick Weingart and Chunjing Zhao.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Switzerland AG
About this chapter
Cite this chapter
Standau, T., Altstädt, V. (2019). Foams. In: Karger-Kocsis, J., Bárány, T. (eds) Polypropylene Handbook. Springer, Cham. https://doi.org/10.1007/978-3-030-12903-3_10
Download citation
DOI: https://doi.org/10.1007/978-3-030-12903-3_10
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-12902-6
Online ISBN: 978-3-030-12903-3
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)