Application and control of large-scale deformation (mechano-optical deformation) induced by photoirradiation

第一年制备了感光膜，第二年研究了感光膜的光化学性质。详情如下所述。嵌段共聚物及其偶氮苯衍生物的制备：采用阴离子活性聚合法制备了聚（N，N-二甲基-4-乙烯基苯乙胺-嵌段乙烯）嵌段共聚物（PPTA-b-PSt）。以对硝基苯醇为原料制备了p， p′-双（氯甲基）偶氮苯（CAB）。交联光负责膜的制备与表征：通过适当的反应时间和温度，可以将PPTA的季铵化度控制在0% ~ 100%。CAB的两端通过季铵化作用与嵌段共聚物中PPTA的氨基相连，从而形成交联膜。膜的紫外光谱显示出三个吸收峰，这是由于cab的反式和顺式形成的。照相记录性能的评价：当薄膜被紫外线照射时，CAB从反式到顺式发生光异构化。顺式的保留和删除是通过改变嵌段共聚物中PPTA的热运动来控制的。机械光学行为的应用与控制：当薄膜在PPTA玻璃化温度以上用紫外光照射时，薄膜由于CAB的构象变化而变形。该过程应用于诱导光刺激的机械运动（机械-光学变形）。为了抑制和/或刺激薄膜的机械光学变形，进行了系统的光化学研究。利用KWW方程对膜的光照射时间依赖性进行了分析。

The photo-responsible film was prepared during the first year and the photochemical properties of the films were investigated during the second year. The details are described in the following.1.Preparation of block copolymer and azobenzene derivative : Poly (N,N-dimethyl-4-vinylphenethylamine-block-stirene) block copolymer (PPTA-b-PSt) was prepared by anionic living polymerization. p, p'-Bis (chloromethyl) azobenzene (CAB) was prepared from p-nitrobenzyl alcohol.2.Preparation and characterization of the cross-linked photo-responsible films : We could control the degree of quaternization of PPTA from 0% to 100% by using the appropriate reaction time and temperature. Both the ends of CAB were attached to amino groups of PPTA in the block copolymer by quaternization to permit cross-linked films. A UV spectrum of the film showed three absorption peaks due to the trans and cis form of CAB.3.Evaluation of photo-recording properties : When the films were irradiated with ultraviolet light (UV), CAB underwent photoisomerization from the trans to the cis form. The retention and deletion of the cis form were controlled by an alternation of the thermal motion of PPTA in the block copolymer.4.Application and control of mechano-optical behavior : When the films were irradiated with UV light above a glass transition temperature of PPTA,the film was deformed by conformational changes of CAB.The process should be utilized to induce photostimulated mechanical motion (mechano-optical deformation). In order to suppress and/or stimulate the mechano-optical deformation of the film, a systematic photochemical study was carried out in detail. Photo-irradiation time dependence of the films was analyzed by KWW equation to estimate the results.