Abstract
Curing behaviors of the unsaturated polyester resin (UPR) containing 1–1.8 wt% methyl ethyl ketone peroxide (MEKP) initiator are investigated. The viscosity, gelation and vitrification transition of the UPR-MEKP systems are examined using the rotating viscometer and differential scanning calorimetry (DSC). A liquid fragility parameter, M c, defined as the viscosity variation rate of the liquids towards the curing temperature is presented. It is found that M c has a good negative relation with the glass transition temperature (T g) in the systems. M c can be used for predicting the stability of the cured amorphous systems. The relationship between the liquid and cured thermoset polymer systems is studied from both the thermodynamic and kinetic point of view.
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References
Jankovic B. The kinetic analysis of isothermal curing reaction of an unsaturated polyester resin: Estimation of the density distribution function of the apparent activation energy. Chem Eng J, 2010, 162: 331–340
Campbell FC. Manufacturing Processes for Advanced Composites, 1 ed. Oxford: Elsevier, 2003, 1–37
Alkskas IA, El-gnidi BA, Azam F. Synthesis and characterization of new unsaturated polyesters containing cyclopentapyrazoline moiety in the main chain. J Appl Polym Sci, 2010, 115: 3727–3736
Martin JL. Kinetic analysis of two DSC peaks in the curing of an unsaturated polyester resin catalyzed with methylethylketone peroxide and cobalt octoate. Polym Eng Sci, 2007, 47: 62–70
Vargas MA, Sachsenheimer K, Guthausen G. In situ investigations of the curing of a polyester resin. Poly Test, 2012, 31: 127–135
Yun YM, Lee SJ, Lee KJ, Lee YK, Nam JD. Composite cure kinetic analysis of unsaturated polyester free radical polymerization. J Polym Sci Part B: Polym Phys, 1997, 35: 2447–2456
Lu MG, Shim MJ, Kim SW. Curing behavior of an unsaturated polyester system analyzed by Avrami equation. Thermochim Acta, 1998, 323: 37–42
Ramis X, Salla JM. Effect of the inhibitor on the curing of an unsaturated polyester resin. Polymer, 1995, 36: 3511–3521
Stevenson JF. Free radical polymerization models for simulating reactive processing. Polym Eng Sci, 1986, 26: 746–759
Gonzalez-Romero VM, Macosko CW. Viscosity rise during free radical crosslinking polymerization with inhibition. J Rheology, 1985, 29: 259–272
Yang YS, Viscosities of Unsaturated polyester resins: Combining effects of prepolymer structure, resin composition, and temperature. J Appl Polym Sci, 1996, 60: 2387–2395
Tungare AV, Martin GC, Gotro JT. Chemorheological characterization of thermoset cure. Polym Eng Sci, 1988, 28: 1071–1075
Aelenei N, Schneider IA. Viscosity-temperature relationships for poly(vinyl chloride)-tetrahydrofuran dilute solutions. Europ Polym J, 1976, 12: 849–852
Anderson PW. The deepest and most interesting unsolved problem in solid state theory is probably the theory of the nature of glass transition. Science, 1995, 267: 1615
Dong J P, Lee J H, Lai D H, Huang YJ. Effects of reactive low-profile additives on the properties of cured unsaturated polyester resins. II. Glass-transition temperature and mechanical properties. J Appl Polym Sci, 2006, 100: 867–878
Bian XF, Sun BA, Hu LN, Jia YB. Fragility of superheated melts and glass-forming ability in Al-based alloys. Phys Lett A, 2005, 335: 61–67
Meng QG, Zhang SG, Xia MX, Li JG, Zhou JK. Superheated liquid fragility and thermodynamic refinement for evaluation of metallic glass-forming ability. Appl Phys Lett, 2007, 90: 031910–031912
Ren Z F, Bian XF, Lin LJ, Bai YW, Wang WM. Viscosity and melt fragility in honey-water mixtures. J Food Eng, 2010, 100: 705–710
Guo K, Bian XF, Li ZH, Qin JY, Study on a parameter to express glass-forming relationship of phenolic-novolac resin. Polym Compos, 2012, 33: 52–57
Janković B, The kinetic analysis of isothermal curing reaction of an unsaturated polyester resin: Estimation of the density distribution function of the apparent activation energy. Chem Eng J, 2010, 162: 331–340
R Raja Pandiyan K, Neogi S. Viscosity modeling of a medium reactive unsaturated polyester resin used for liquid composite molding process. J Appl Polym Sci, 2012, 125: 1400–1408
Canamero-Martınez P, Luis de la Fuente J, Fernandez-Garcıa M. Master curve and time-temperature-transformation cure diagram of a polyfunctional epoxy acrylic resin. J Appl Polym Sci, 2011, 120: 2166–2172
Angell CA, Formation of glasses from liquids and biopolymers. Science, 1995, 267: 1924–1935
Jia R, Bian XF, Lv XQ, Song KK, Li XL. The relationship between viscosity and glass forming ability of Al-(Ni)-Yb alloy systems. Sci China Phys Mech Astron, 2010, 53: 390–393
Guo J, Bian XF, Meng QG, Zhao Y, Wang SH, Wang CD, Li TB. Glass-forming ability and fragility of RE55Al25Co20 (RE = Ce, Pr, Nd, Sm, Gd) alloys, Scripta Mater, 2006, 55: 1027–1030
Guo J, Bian XF, Zhao Y, Zhang SJ, Correlation between the fragility of supercooled liquids and thermal expansion in the glassy state for Gd-based glass-forming alloys. J Phys: Condensed Matter, 2007, 19: 116103
Meng QG, Zhou JK, Zheng HX, Li JG. Fragility of superheated melts and glass-forming ability in Pr-based alloys. Scripta Mater, 2006, 54: 777–781
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Zhao, X., Bian, X., Yang, C. et al. Liquid fragility of the unsaturated polyester resin. Sci. China Chem. 56, 724–728 (2013). https://doi.org/10.1007/s11426-013-4853-5
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DOI: https://doi.org/10.1007/s11426-013-4853-5