Abstract
Three series of segmented polyurethanes based on MDI, variable chain extender, and polypropylene oxide of MW=1000, 2000, and 3000 were synthesized and their dielectric behavior examined.
Dielectric relaxations in the segmented polyurethanes were investigated between −150°C and +150°C in the 100 Hz to 10 kHz range. In general, three transitions, designated asα, β, and γ were observed, and ascribed in accordance with calorimetric relaxations to glass transitions of the hard and soft segments, and Shatzki-type motions, respectively. The effect of structure variables such as soft segment size, type of chain extender (ethylene glycol, butane diol, and hexane diol) and soft segment concentration, as well as the effect of interaction of the phases on dielectric properties was discussed. It was found that a certain degree of phase mixing exists in all series, detected by the variation of theT g of the soft segment with soft segment concentration, contrary to DSC results, which was ascribed to thermal treatment prior to the dielectric measurements. It appears that interfacial polarization becomes important only above theα transition temperature.
Similar content being viewed by others
References
Wright P, Cumming A (1968) Solid Polyurethane Elastomers. Mac Laren and Sons, London
Buist JM, Gudgeon H (1969) Advances in Polyurethane Technology. MacLaren and Sons Ltd, London
Hepburn C (1982) Polyurethane Elastomers. Applied Science Publishers, London
Cooper SL, Tobolsky AV (1966) J Appl Polym Sci 36:800
Rinke H (1962) Angew Chem 74:612
Bonart R, Morbitzer L, Muller EH (1974) J Macromol Sci, B9:447
Leung LM, Koberstein JT (1986) Macromol 19:706
Bonart R, Morbitzer L, Rinke H (1970) Kolloid Z Z Polym 240:870
Leung LM, Koberstein JT (1985) J Polym Sci Polym Sci Ed 23:1883
Camberlin Y, Pascault JP (1983) J Polym Sci, Polym Chem Ed 21:415
Camberlin Y, Pascault JP (1985) J Polym Sci, Polym Chem Ed, 23:1835
Petrović Z, Ferguson J (1978) Hem Industr Belgrade, 32(8):351
Abouzahr S, Wilkes GL, Ophir Z (1982) Polymer 23:1077
Petrović Z, Budinski-Simendić J (1985) Rubb Chem Technol, 58:701
Oertel G (ed) (1985) Polyurethane Handbook. Hanser Publishers, Munich
McCrum NG, Read BE, Williams G (1967) Anelastic and Dielectric Effects in Polymeric Solids. John Wiley and Sons, New York, p 478–500
Hedvig P (1977) Dielectric Spectroscopy of Polymers. Akademiai Kiado, Budapest, p 247
Kajiyama T, MacKnight WJ (1969) Macromol 2(3):254
See ref 16, p 561–574
Vallance MA, Yeung AS, Cooper SL (1983) Colloid Polym Sci 261:541
Petrović Z, Ferenc Koco, Laslo Horvath and Nesto Dulić, to be published in J Appl Polym Sci
Lilaonitkul A, Cooper SL (1979) Macromol 12(6):1146
Williams G (1965) Trans Faraday Soc 61:1564
Beaumont RH, Clegg B, Gee G, Herbert JM, Marks DJ, Roberts RC, Sims D (1966) Polymer, 7:401
Pathmanathan K, Johari GP, Chan RK (1986) Polymer 27:1907
North AM, Reid JC, Shortall JB (1969) Europ Polym J 5:565
North AM, Reid JC (1972) Europ Polym J 8:1129
Petrović ZS, Javni I (1989) J Polym Sci, Phys Ed 27(3):545
Dickinson LC, Morganelli P, Chu CW, Petrović Z, MacKnight WJ, Chien JCW (1988) Macromol 21:338
Eisenbach CD, Baumgartner M, Gunter C (1986) In: Lal J, Mark JE (eds) Advances in Elastomer and Rubber Elasticity. Plenum Publish Inc, New York, pp 51–87
Petrović ZS, Budinski-Simendić J (1985) Rubb Chem Technol 58:685
Lyman DJ (1960) J Polym Sci XLV:49
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Petrović, Z.S., Javni, I. & Jelčić, Ž. The effect of segment length and concentration on dielectric properties of polypropyleneoxide-based polyurethanes. Colloid & Polymer Sci 267, 1077–1086 (1989). https://doi.org/10.1007/BF01496927
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01496927