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Nonspherical Uniaxial Azobenzene Polymer Particles and Their Shape Changes under UV- or White-Light Irradiation for Stimuli-Response Applications
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsapm.0c00475 Tomomichi Itoh 1 , Tetsuo Tamamitsu 1 , Tatsuro Aki 1 , Kento Tsutsui 1 , Yuki Mori 1 , Hiroyuki Kudo 2 , Masatoshi Tokita 2 , Hiroaki Shimomoto 1 , Eiji Ihara 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsapm.0c00475 Tomomichi Itoh 1 , Tetsuo Tamamitsu 1 , Tatsuro Aki 1 , Kento Tsutsui 1 , Yuki Mori 1 , Hiroyuki Kudo 2 , Masatoshi Tokita 2 , Hiroaki Shimomoto 1 , Eiji Ihara 1
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In this study, we developed azobenzene polymer particles showing several light-induced shape changes. Conventional azobenzene particles require exposure to polarized white or blue light on a substrate for shape elongation. First, the dispersion polymerization of 6-[4-(4′-methoxyphenylazo)phenoxy]hexyl methacrylate afforded unique oval or short cylindrical shapes with controlled sizes and narrow size distributions. Then, polarized optical microscopic observations and wide-angle X-ray diffraction measurements suggest that the azobenzene moiety formed a uniaxially orientated smectic-layered structure in the particles. Differential scanning calorimetric measurements indicated that the packing structures and particle shapes were closely related to each other. Finally, the particle shape was altered by the trans–cis photoisomerization of azobenzene accompanied by the deformation of the azobenzene packing structure. Interestingly, their shape anisotropy was increased by ultraviolet and white-light irradiation. The particle shape was changed in a dispersed medium and on a substrate by unpolarized light. Consequently, the combination of a light source and site varied the light-induced shape changes of the azobenzene particles.
中文翻译：
非球面单轴偶氮苯聚合物颗粒及其在紫外线或白光照射下的形状变化，用于刺激反应。
在这项研究中，我们开发了显示出几种光致形状变化的偶氮苯聚合物颗粒。常规的偶氮苯颗粒需要暴露在基材上的偏振白光或蓝光下以延长形状。首先，6-丙烯酸4- [4-（4'-甲氧基苯基偶氮）苯氧基]己基酯的分散聚合反应可得到独特的椭圆形或短圆柱形状，其尺寸可控，尺寸分布窄。然后，偏振光学显微镜观察和广角X射线衍射测量表明，偶氮苯部分在颗粒中形成了单轴取向的近晶层状结构。差示扫描量热法测量表明填充结构和颗粒形状彼此紧密相关。最后，偶氮苯的反式-顺式光异构化伴随着偶氮苯堆积结构的变形而改变了颗粒形状。有趣的是，它们的形状各向异性通过紫外线和白光照射而增加。颗粒形状在分散介质中和基板上通过非偏振光改变。因此，光源和部位的组合改变了偶氮苯颗粒的光致形状变化。
更新日期：2020-05-19
中文翻译：
非球面单轴偶氮苯聚合物颗粒及其在紫外线或白光照射下的形状变化，用于刺激反应。
在这项研究中，我们开发了显示出几种光致形状变化的偶氮苯聚合物颗粒。常规的偶氮苯颗粒需要暴露在基材上的偏振白光或蓝光下以延长形状。首先，6-丙烯酸4- [4-（4'-甲氧基苯基偶氮）苯氧基]己基酯的分散聚合反应可得到独特的椭圆形或短圆柱形状，其尺寸可控，尺寸分布窄。然后，偏振光学显微镜观察和广角X射线衍射测量表明，偶氮苯部分在颗粒中形成了单轴取向的近晶层状结构。差示扫描量热法测量表明填充结构和颗粒形状彼此紧密相关。最后，偶氮苯的反式-顺式光异构化伴随着偶氮苯堆积结构的变形而改变了颗粒形状。有趣的是，它们的形状各向异性通过紫外线和白光照射而增加。颗粒形状在分散介质中和基板上通过非偏振光改变。因此，光源和部位的组合改变了偶氮苯颗粒的光致形状变化。
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