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首页> 外文期刊>Journal of Applied Polymer Science >Effects of chemical structure of polyurethane-based low-profile additives on the miscibility, curing behavior, volume shrinkage, glass transition temperatures, and mechanical properties for styrene/unsaturated polyester/low-profile additive ternary s
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Effects of chemical structure of polyurethane-based low-profile additives on the miscibility, curing behavior, volume shrinkage, glass transition temperatures, and mechanical properties for styrene/unsaturated polyester/low-profile additive ternary s

机译：聚氨酯基低轮廓添加剂的化学结构对苯乙烯/不饱和聚酯/低轮廓添加剂三元体系的混溶性，固化行为，体积收缩，玻璃化转变温度和机械性能的影响

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摘要

The effects of chemical structure and molecular weight of three series of thermoplastic polyurethane-based (PU) low-profile additives (LPA) on the miscibility of styrene (ST)/unsaturated polyester (UP) resin/LPA ternary systems prior to reaction were investigated by using the Flory-Huggins theory and group contribution methods. The reaction kinetics during the cure at 110 degrees C and the cured sample morphology were also studied by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), respectively. The phase-separation characteristics of ST/UP/LPA systems during the cure, as revealed by the cured-sample morphology, and the DSC reaction-rate profile, could be generally predicted by the calculated upper critical solution temperature for the uncured ST/UP/LPA systems. Finally, based on the measurements for volume change and microvoid formation, volume shrinkage characteristics for the cured ST/UP/LPA systems have been explored. (C) 2000 John Wiley & Sons, Inc. [References: 27]
机译：研究了反应前三系列热塑性聚氨酯基（PU）低调添加剂（LPA）的化学结构和分子量对苯乙烯（ST）/不饱和聚酯（UP）树脂/ LPA三元体系混溶性的影响通过使用Flory-Huggins理论和小组贡献方法。还分别通过差示扫描量热法（DSC）和扫描电子显微镜（SEM）研究了在110℃下固化期间的反应动力学和固化的样品形态。如固化样品的形态和DSC反应速率曲线所揭示的，固化期间ST / UP / LPA系统的相分离特性通常可以通过计算出的未固化ST / UP的上临界溶液温度来预测/ LPA系统。最后，基于体积变化和微孔形成的测量，已经研究了固化的ST / UP / LPA系统的体积收缩特性。 （C）2000 John Wiley＆Sons，Inc. [参考：27]

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