Molecular motion in polymers is frozen below the glass transition temperature $T_g$ and changes of viscoelastic functions are most spectacular near $T_g$. Exceptional enhancement of molecular mobility and a decrease of polymer viscosity, by several orders of magnitude, down to the viscous flow regime, are observed way below $T_g$ by light absorption. Relaxation processes, which take decades to centuries in some high-$T_g$ polymers, are reduced to minute timescales by sub-$T_g$ light absorption. Here we develop a model for this intriguing albeit spectacular action of light on glass forming materials and we propose experiments to relate light absorption to materials properties. The model provides a solution to a long-lasting problem of how molecular mobility is enhanced in solid polymers by photoisomerization and provides a tool for a better understanding of the relationship between light absorption and material properties and developing photosensitive polymers for light to mechanical energy transduction.

中文翻译：

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通过光非热增强固体聚合物中分子迁移性的模型

聚合物中的分子运动在玻璃化转变温度以下冻结 ${Ť}_G$ 粘弹性函数的变化在附近最为明显 ${Ť}_G$。在下面的方式中，观察到分子迁移性异常增强，聚合物粘度下降了几个数量级，直至粘度流态。${Ť}_G$通过光吸收。松弛过程，在某些高${Ť}_G$ 聚合物，通过减少${Ť}_G$光吸收。尽管光在玻璃成型材料上具有惊人的作用，但我们在此开发了一个模型，我们提出了将光吸收与材料性能相关联的实验。该模型为长期存在的问题提供了解决方案，该问题涉及如何通过光异构化提高固体聚合物中的分子迁移率，并为更好地了解光吸收与材料特性之间的关系以及开发用于光能到机械能传导的光敏聚合物提供了一种工具。