Local Glass Transition Temperature T g ( z ) Profile in Polystyrene next to Polybutadiene with and without Plasticization Effects
Local Glass Transition Temperature T g ( z ) Profile in Polystyrene next to Polybutadiene with and without Plasticization Effects
复制标题
聚苯乙烯与聚丁二烯之间的局部玻璃化转变温度 T g ( z ) 分布，有或没有塑化效应
DOI：
10.1002/macp.201700328
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发表时间：
2017
影响因子：
2.5
通讯作者：
Roth, Connie B.
中科院分区：
文献类型：
--
作者：
Kasavan, Benjamin L.;Baglay, Roman R.;Roth, Connie B.
玻璃状聚苯乙烯 (PS) 的橡胶增韧作为高抗冲聚苯乙烯已经商业化生产了数十年，其中添加了橡胶状聚丁二烯 (PB) 夹杂物以改变 PS 基体对变形和冲击的响应。在这项研究中，提出了 PS 与 PB 橡胶相比的局部玻璃化转变温度 Tg(z) 的测量结果，将之前的数据扩展到 Tg 值低得多的聚合物 (PBTgbulk= -96 °C)。在考虑了商业 PB 样品中存在的小分子添加剂（否则该添加剂会迁移到 PS 域导致塑化）后，发现 PS 中紧邻 PB 的 Tg(z) 曲线与之前的结果一致。通过比较两种不同分子量的聚（甲基丙烯酸正丁酯）制成的样品，还证明这些实验观察到的宽且不对称的Tg（z）曲线不是由低分子量链穿过界面迁移引起的。
Rubber toughening of glassy polystyrene (PS) has been manufactured commercially for decades as high impact polystyrene, where rubbery poly‐butadiene (PB) inclusions are added to modify the PS matrix response to deformation and impact. In this study, measurements of the local glass transition temperatureTg(z) of PS next to PB rubber are presented, expanding the previous data to a polymer with a much lowerTgvalue (PBTgbulk= −96 °C). After accounting for a small molecule additive present in the commercial PB sample that would otherwise migrate over to the PS domain causing plasticization, it is found that theTg(z) profile in PS next to PB is consistent with previous results. It is also demonstrated that these broad and asymmetric experimentally observedTg(z) profiles are not caused by the migration of low molecular weight chains across the interface by comparing samples made with two different poly(n‐butyl methacrylate) molecular weights.