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首页> 外文期刊>Journal of Applied Polymer Science >ELASTOMERIC FILMS FROM STRUCTURED LATEXES
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ELASTOMERIC FILMS FROM STRUCTURED LATEXES

机译：结构化乳胶的弹性膜

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A model structured latex that is capable of forming a self-curable elastomeric film under mild temperature conditions was developed. In this model latex system, a small amount of dimethyl meta-isopropenyl benzyl isocyanate (TMI(R)) was copolymerized with n-butyl acrylate (BA) onto poly(butadiene-co-styrene) [(3P(Bd-S)] seed latex particles. In the final stage of the film formation process, the latex particles coalesce with each other, and interdiffusion of PBA-based polymer chains in the shell layers of adjacent structured particles occurs. At this stage, the isocyanate groups in the P(BA-TMI) shell layer would begin to crosslink by either a moisture-cure reaction via trace amounts of water remaining in the latex film or by a post-added crosslinker that contains amine groups. Improved elastomeric properties of the latex film are expected from this kind of ''interphase'' crosslinking structure. However, latex films prepared from the model P(Bd-S)/P(BA-TMI) core/shell latexes were cracked and brittle, which was explained by the formation of a highly crosslinked/grafted core/shell interphase zone. Saturation of the residual double bonds in the P(Bd-S) seed latex particles by hydrogenation was found to be an effective way to reduce the development of the interphase zone and the degree of crosslinking during the second-stage polymerization. An elastomeric film with good mechanical and anti-aging properties was formed from this hydrogenated-P(Bd-S)/P(BA-TMI) structured latex. (C) 1997 John Wiley & Sons, Inc. [References: 27]
机译：开发了能够在温和的温度条件下形成自固化弹性体膜的模型结构胶乳。在该模型胶乳系统中，将少量的二甲基间异丙烯基苄基异氰酸酯（TMI（R））与丙烯酸正丁酯（BA）共聚到聚（丁二烯-共苯乙烯）[[3P（Bd-S）]种子胶乳颗粒，在成膜过程的最后阶段，胶乳颗粒彼此聚结，并且相邻结构化颗粒的壳层中发生了基于PBA的聚合物链的相互扩散，在此阶段，P中的异氰酸酯基团（BA-TMI）壳层将通过湿固化反应通过胶乳膜中残留的痕量水开始交联，或者通过添加有胺基的后加交联剂开始交联。这种“相间”交联结构，但是，由P（Bd-S）/ P（BA-TMI）核/壳型胶乳制备的胶乳薄膜开裂且变脆，这可以解释为形成高度交联/接枝的核/壳相间区。发现通过氢化使P（Bd-S）种子胶乳颗粒中存在固有的双键是减少第二阶段聚合过程中相区发展和交联度的有效方法。由这种氢化的P（Bd-S）/ P（BA-TMI）结构胶乳形成具有良好机械和抗老化性能的弹性体薄膜。 （C）1997 John Wiley＆Sons，Inc. [参考：27]

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