Photochromic Materials by Postpolymerisation Surface Modification
Photochromic Materials by Postpolymerisation Surface Modification
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DOI：
10.1021/acsomega.8b02521
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发表时间：
2018-11
期刊：
影响因子：
4.1
通讯作者：
Shuyun Chng;M. Moloney;L. Wu
中科院分区：
文献类型：
--
作者：
Shuyun Chng;M. Moloney;L. Wu
光致变色材料是通过多种聚合物的聚合后表面改性，通过多步骤的顺序过程介导的，首先，通过卡宾插入化学，其次，通过重氮偶联与拴链前体，最后通过偶联到螺吡喃。这三步序列是有效的，通常可以实现1013分子cm-2的表面负载密度，从而使材料具有可观察到的光致变色和润湿性行为，这些行为可以在多个循环中运行，而不会出现明显的光漂白或效能损失。适用于该工艺的材料既包括反应性聚合物，也包括低表面能聚合物。虽然该工艺对高表面积材料特别有效，但在低表面积衬底上进行表面改性，虽然本质上效率较低，但仍然足够有效，可以很容易地观察到宏观光致变色特性的变化。
Photochromic materials are available by a postpolymerization surface modification of diverse polymers in a multistep sequential process mediated, first, by carbene insertion chemistry, second, by diazonium coupling with a tethered precursor, and finally by coupling to a spiropyran. This three-step sequence is efficient, and surface loading densities of 1013 molecules cm–2 are typically achievable, leading to materials with observable photochromic and wettability behavior, which operate over multiple cycles without significant photobleaching or loss of efficacy. Materials suitable for application in this process include both reactive, but also lower surface energy polymers. Although the process is particularly efficient for high surface area materials, surface modification onto lower surface area substrates, while being intrinsically less efficient, is nonetheless sufficiently effective that changes in macroscopic photochromic properties are readily observable.