<br>高Tg共轭聚合物薄膜的快速应力松弛,Journal of Polymer Science

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高Tg共轭聚合物薄膜的快速应力松弛
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2023-11-11 , DOI: 10.1002/pol.20230671
Guorong Ma ₁ , Song Zhang ₁ , Luke A. Galuska ₁ , Xiaodan Gu ₁

Affiliation

共轭聚合物由复杂的主链结构和侧链部分组成，以满足各种光电和加工要求。最近关于共轭聚合物的工作致力于研究机械性能并开发具有低模量和高裂纹起始应变的新型共轭聚合物，而长期外部拉伸应变下的薄膜机械稳定性研究较少。在这里_，我们对高Tg和低Tg_共轭聚合物以及参考非共轭样品聚苯乙烯上的独立式薄膜和漂浮在水面上的薄膜进行了直接机械应力松弛测试。我们测量了膜厚范围为 38 至 179 nm 的薄膜，以研究温度和厚度对薄膜弛豫的影响，观察到玻璃状聚合物 PS 和 PM6 薄膜的明显的熵补偿效应。我们还比较了三种不同共轭聚合物的弛豫时间，结果表明，除了较高的玻璃化转变温度之外，晶体形态和较高的模量都会降低弛豫速率。我们的工作提供了对共轭聚合物机械蠕变行为的见解，这将对稳定功能有机电子器件的未来设计产生影响。

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Rapid stress relaxation of high-Tg conjugated polymeric thin films

Conjugated polymers consist of complex backbone structures and side-chain moieties to meet various optoelectronic and processing requirements. Recent work on conjugated polymers has been devoted to studying the mechanical properties and developing new conjugated polymers with low modulus and high-crack onset strain, while the thin film mechanical stability under long-term external tensile strain is less investigated. Here we performed direct mechanical stress relaxation tests for both free-standing and thin film floated on water surface on both high-T_g and low-T_g conjugated polymers, as well as a reference nonconjugated sample, polystyrene. We measured thin films with a range of film thickness from 38 to 179 nm to study the temperature and thickness effect on thin film relaxation, where an apparent enthalpy–entropy compensation effect for glassy polymer PS and PM6 thin films was observed. We also compared relaxation times across three different conjugated polymers and showed that both crystalline morphology and higher modulus reduce the relaxation rate besides higher glass transition temperature. Our work provides insights into the mechanical creep behavior of conjugated polymers, which will have an impact on the future design of stable functional organic electronics.

更新日期：2023-11-11

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