Abstract A series of novel structured latex particles with semi-interpenetrating polymer network (IPN) of glassy styrene-acrylonitrile copolymer (SAN) cores and rubbery polyurethane (PU) shells were synthesized to improve damping property. The inverted core/shell synthesis method (rubbery part first, then the glassy part) was applied to control morphology of core/shell latex particles. The glass transition temperature and mechanical property of the obtained semi-IPN were characterized by DMA and UTM, respectively. The effect of composition on the mechanical properties of core/shell latex IPN particles was studied. It was found that the core/shell latex particles with high crosslinking density are more miscible than those with low crosslinking density. Additionally, the improved tensile strength and elongation were observed. Therefore, the crosslinking efficiency of PU plays an important role in governing phase miscibility in core/shell latex IPN particles.

中文翻译：

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半互穿聚合物网络聚氨酯/苯乙烯丙烯腈胶乳颗粒的结构相互作用

摘要 合成了一系列具有半互穿聚合物网络（IPN）的玻璃状苯乙烯-丙烯腈共聚物（SAN）核和橡胶状聚氨酯（PU）壳的新型结构胶乳颗粒，以提高阻尼性能。应用倒核/壳合成方法（首先是橡胶部分，然后是玻璃部分）来控制核/壳胶乳颗粒的形态。所得半IPN的玻璃化转变温度和机械性能分别通过DMA和UTM表征。研究了组成对核/壳胶乳 IPN 颗粒机械性能的影响。发现具有高交联密度的核/壳胶乳颗粒比具有低交联密度的那些更易混溶。此外，还观察到了改进的拉伸强度和伸长率。所以，