Symmetry-Dictated Mesophase Formation and Phase Diagram of Perfluorinated Polyhedral Oligomeric Silsesquioxanes
Symmetry-Dictated Mesophase Formation and Phase Diagram of Perfluorinated Polyhedral Oligomeric Silsesquioxanes
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全氟多面体低聚倍半硅氧烷的对称性介导的中间相形成和相图
DOI：
10.1021/acs.macromol.9b00138
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发表时间：
2019-03
期刊：
影响因子：
5.5
通讯作者：
Zhang Wen Bin
中科院分区：
文献类型：
--
作者：
Shao Yu;Xu Xian;Yin Guang Zhong;Han Shuai Yuan;Han Di;Fu Qiang;Yang Shuguang;Zhang Wen Bin
We report the symmetry-dictated mesophase formation and phase diagram of a series of T8-polyhedral oligomeric silsesquioxane (POSS) derivatives bearing perfluoroalkyl chains and hydroxyl alkyl groups. The phase structures and phase behaviors of these molecular Janus particles were studied by DSC, POM, FT-IR, and WAXD experiments. It was found that introducing one hydroxyl alkyl group leads to a decreased crystal melting point, and incorporating two hydroxyl alkyl groups at different POSS positions causes the formation of lamellar liquid crystal mesophases with feature sizes and transition temperatures that depend on the symmetry of these regioisomers. Interestingly, installing only one substituent with two hydroxyl groups leads to monotropic phase transitions, where the mesophase appears only upon cooling from the isotropic melt within the narrow supercooling window. Phase diagrams were systematically constructed for these compounds and understood based on the fine influence of symmetry on their possible ...
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DOI：
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发表时间：
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影响因子：
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DOI：
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