A novel mechanism for well‐pronounced mechanochromism in blends of a π‐conjugated polymer based on reversible conformational transitions of a chromophore rather than caused by its aggregation state, is exemplified. Particularly, a strong stretching‐induced bathochromic shift of the light absorption, or hypsochromic shift of the emission, is found in blends of the water‐soluble poly(3‐tri(ethylene glycol)) (P3TEOT) embedded into the matrix of thermoplastic polyvinyl alcohol. This counterintuitive phenomenon is explained in terms of the concentration dependency of the P3TEOT's aggregation state, which in turn results in different molecular conformations and optical properties. A molecular flexibility, provided by low glass transition temperature of P3TEOT, and the fact that P3TEOT adopts an intermediate, moderately planar conformation in the solid state, are responsible for the unusual complex mechanochromic behavior.

中文翻译：

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π共轭聚合物P3TEOT共混物中的显着机械致变色作用：构象转变和聚集的作用

举例说明了一种基于发色团的可逆构象转变而不是由其聚集态引起的π共轭聚合物共混物中明显的机械致变色的新机理。特别是，嵌入到热塑性聚乙烯基体中的水溶性聚（3-三（乙二醇））（P3TEOT）的混合物中发现了强烈的拉伸诱导的光吸收性红变色或发射的七色变色。酒精。这种与直觉相反的现象是根据P3TEOT聚集态的浓度依赖性来解释的，这反过来又导致了不同的分子构象和光学性质。P3TEOT的低玻璃化转变温度和P3TEOT采用中间体的事实提供了分子柔性，