Variations in the glass transition temperature of polyester with special architectures confined in thin films
Variations in the glass transition temperature of polyester with special architectures confined in thin films
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DOI：
10.1016/j.polymer.2009.11.032
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发表时间：
2010-01
期刊：
影响因子：
4.6
通讯作者：
M. Erber;A. Khalyavina;K. Eichhorn;B. Voit
中科院分区：
文献类型：
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作者：
M. Erber;A. Khalyavina;K. Eichhorn;B. Voit
用变温可见-椭圆偏振光谱法研究了不同体系结构的聚酯在薄膜约束条件下的聚合物动力学变化。调整结构以评价（a）不同聚合物主链（超支化、支化或线性和芳族、芳族-脂族或脂族）的影响，（B）官能团（羟基、苯甲酰基、叔丁基二甲基甲硅烷基）的影响和（c）与硅基底的界面相互作用（吸引、排斥）的作用。玻璃化转变温度Tgin薄的聚合物膜（10-800 nm）从散装值的偏差的可能原因进行了描述，并与文献相比。结果发现，所应用的聚合物的官能团对Tg具有最大的影响。除了界面相互作用外，聚合物膜中的化学和物理反应也起着重要作用。
Variations of the polymer dynamic of different systematically varied polyester architectures in the confinement of thin films were studied by temperature dependent spectroscopic vis-ellipsometry. The architectures were tailored in order to evaluate (a) the impact of different polymer backbones (hyperbranched, branched or linear and aromatic, aromatic–aliphatic or aliphatic), (b) the influence of functional groups (hydroxyl, benzoyl, tert-butyldimethylsilyl) and (c) the role of interfacial interactions (attractive, repulsive) with the silicon substrate. Possible reasons for the deviation of the glass transition temperature Tgin thin polymer films (10–800 nm) from the bulk value are described and compared to the literature. It was found that the functional groups of the applied polymers have the largest effect on Tg. Beside interfacial interactions, chemical and physical reactions in the polymer film are playing a significant role.