热塑性弹性体SISIS的微相分离、性能及应用

Micro-phase separation,properties and application of thermoplastic elastomer SISIS

用差示扫描量热仪测试ＳＩＳＩＳ的玻璃化转变温度分别为３７３Ｋ和２１５Ｋ。用电子显微镜观察并分析了高分子结构对微观相分离的影响，ＳＩＳＩＳ呈现明显的两相分离结构特点，较高的聚苯乙烯含量或较长的中间段聚苯乙烯链段有助于形成更精细的微观相分离。考察了该聚合物的力学性能及其应用于热熔压敏胶的情况，结果表明，该嵌段共聚物具有典型的热塑性弹性体的特性，作为主胶应用于热熔压敏胶时的初粘性在８０ｍｍ以下，持粘时间２０ｍｉｎ以上，剥离强度大于０．５ｋＮ／ｍ。

The glass-transition temperatures of pentablock copolymer SISIS were verified by DSC which were 373 K and 215 K respectively.The characteristics of two-phase separation was studied by electron microscopy and the result showed that the state of two-phase separation was largely affected by the structure of polymer molecules.The mechanical properties of SISIS were measured and its hot melt pressure sensitive adhesive was prepared and investigated.The result showed that the SISIS had typical characteristics of thermoplastic elastomer.The hot melt pressure sensitive adhesive with SISIS as main material had the initial adhesive below 80 mm,lasting adhesive over 20 min and peel strength more than 0.5 kN/m.