Effects of thermoplastic additives on mechanical properties and glass transition temperatures for styrene-crosslinked low-shrink polyester matrices
Effects of thermoplastic additives on mechanical properties and glass transition temperatures for styrene-crosslinked low-shrink polyester matrices
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DOI：
10.1016/s0032-3861(97)10280-4
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发表时间：
1998-07-01
期刊：
影响因子：
4.6
通讯作者：
Horng, JC
中科院分区：
文献类型：
--
作者：
Huang, YJ;Horng, JC
通过静态相特性-固化样品形态-反应转化率-性能测试的综合方法，研究了聚醋酸乙烯酯(PVAc)、聚甲基丙烯酸甲酯(PMMA)、热塑性聚氨酯(PU)和聚苯乙烯(PS)四种低调添加剂(LPA)以及苯乙烯与聚酯C=C键的摩尔比对苯乙烯-交联型低收缩聚酯基质的力学性能和玻璃化转变温度(T-g)的影响。实验结果表明，随着LPA含量的增加，苯乙烯交联型聚酯主要连续相的力学性能和T-g普遍下降，而少量共连续相或分散相的T-g则呈相反趋势。在mR=2/1时，通常存在一个最佳的苯乙烯与聚酯C=C键的摩尔比，无论是低于还是高于这个摩尔比，都会导致主要连续相的力学性能变差，玻璃化转变温度降低。在高谷永的力学模型的基础上，探讨了控制力学性能和玻璃化转变温度的因素。(C)1998爱思唯尔科学有限公司。保留所有权利。
The effects of four low-profile additives (LPA), namely poly(vinyl acetate) (PVAc), poly(methyl methacrylate) (PMMA), thermoplastic polyurethane (PU), and polystyrene (PS), and molar ratio of styrene to polyester C=C bonds, on the mechanical properties and glass transition temperatures (T-g) for styrene-crosslinked low-shrink polyester matrices were investigated by an integrated approach of static phase characteristics-cured sample morphology-reaction conversion-properties measurements. Experimental results showed that both mechanical properties and T-g in the major continuous phase of styrene-crosslinked polyester would be generally decreased with increasing LPA content, while T-g in the minor co-continuous or dispersed phase of styrene-crosslinked polyester would show the reverse trend. Also, there usually existed an optimal molar ratio of styrene to polyester C=C bonds at MR 2/1, either below or above which would cause inferior mechanical properties and lower T-g in the major continuous phase. Based on the Takayanagi mechanical models, factors which control the mechanical properties and T,have been explored. (C) 1998 Elsevier Science Ltd. All rights reserved.