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首页> 外文期刊>Macromolecular reaction engineering >Manipulating Latex Polymer Microstructure Using Chain Transfer Agent and Cross-Linker to Modify PSA Performance and Viscoelasticity
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Manipulating Latex Polymer Microstructure Using Chain Transfer Agent and Cross-Linker to Modify PSA Performance and Viscoelasticity

机译：使用链转移剂和交联剂改变胶乳聚合物的微观结构，以改善其PSA性能和粘弹性

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摘要

Two series of butyl acrylate (BA)/acrylic acid (AA)/2-hydroxy ethyl methacrylate latexes were produced via starved seeded semi-batch emulsion polymerization. The first series, five latexes with gel contents ranging from 0 to 75 wt.-%, were generated by varying the amount of chain transfer agent (CTA, n-dodecyl mercaptan) in the absence of cross-linker. The second series, two latexes with gel contents of 49 and 74 wt.-%, were obtained by manipulating the amount of CTA in the presence of a constant cross-linker (allyl methacrylate) concentration. Latexes with similar gel contents, one from each series, were compared with respect to their microstructure, viscoelastic properties and pressure-sensitive adhesive performance. At similar gel contents, latexes obtained in the absence of cross-linker had larger sol polymer molecular weight (M_w) and molecular weight between cross-linking points (M_c), compared to the latexes generated using both CTA and cross-linker. The different microstructures of latexes with similar gel contents resulted in significantly different viscoelastic properties and shear strength of the pressure-sensitive adhesive films cast from the latexes.
机译：通过饥饿的种子半间歇乳液聚合生产了两个系列的丙烯酸丁酯（BA）/丙烯酸（AA）/ 2-甲基丙烯酸羟乙酯胶乳。第一个系列是在不存在交联剂的情况下通过改变链转移剂（CTA，正十二烷基硫醇）的量生成的五种胶乳，其凝胶含量为0至75 wt .-％。第二系列，凝胶含量分别为49和74 wt .-％的两种胶乳，是通过在恒定交联剂（甲基丙烯酸烯丙酯）浓度存在下控制CTA的量而获得的。比较了具有相似凝胶含量的乳胶（各系列之一）的微观结构，粘弹性和压敏粘合性能。与使用CTA和交联剂生成的胶乳相比，在相似的凝胶含量下，在不存在交联剂的情况下获得的胶乳具有更大的溶胶聚合物分子量（M_w）和交联点之间的分子量（M_c）。具有相似凝胶含量的胶乳的不同微观结构导致由该胶乳流延的压敏胶粘膜的粘弹性和剪切强度显着不同。

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