Organic polymeric microspheres, which can be easily synthesized through simple emulsion polymerization, are important building blocks of photonic crystal structural color materials. However, the poor heat resistance of organic polymeric photonic crystals is the intrinsic drawback that severely limits their practical application. In this study, novel polymeric photonic crystal structures with robust heat resistance are developed from the self-assembly of thiodiphenol–formaldehyde (TPF) microspheres. TPF microspheres with controllable particle size and high monodispersity are synthesized through polycondensation and cross-linking reaction between 4,4′-thiodiphenol and formaldehyde via a hydrothermal process. Derived from the highly cross-linked network structure and high content of aromatic rings and sulfur atoms of the TPF microspheres, the obtained polymeric photonic crystals exhibit bright structural colors and excellent heat resistance up to 250 °C. By contrast, general polystyrene photonic crystals possess poor heat resistance (<110 °C), due to the linear macromolecular structure. The distinct heat resistance feature of TPF structural colors is highly important for expanding their practical applications.

中文翻译：

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来自有机聚合物光子晶体的明亮结构色，具有强大的耐热性

可以通过简单的乳液聚合轻松合成的有机聚合物微球是光子晶体结构彩色材料的重要组成部分。但是，有机聚合物光子晶体的耐热性差是其固有的缺点，严重限制了它们的实际应用。在这项研究中，从硫代二酚-甲醛（TPF）微球的自组装中开发出了具有强大耐热性的新型聚合物光子晶体结构。通过缩聚反应和4,4'-硫代二酚与甲醛的交联反应，合成了粒径可控，单分散性高的TPF微球。水热过程。得益于TPF微球的高度交联的网络结构以及芳香环和硫原子的高含量，所获得的聚合物光子晶体显示出明亮的结构颜色和高达250°C的优异耐热性。相比之下，由于线性大分子结构，一般的聚苯乙烯光子晶体具有较差的耐热性（<110°C）。TPF结构色的独特耐热特性对于扩展其实际应用非常重要。