Photoinduced Birefringent Pattern and Photoinactivation of Liquid Crystalline Copolymer Films with Benzoic Acid and Phenylaldehyde Side Groups
Photoinduced Birefringent Pattern and Photoinactivation of Liquid Crystalline Copolymer Films with Benzoic Acid and Phenylaldehyde Side Groups
复制标题
苯甲酸和苯醛侧基液晶共聚物薄膜的光致双折射图案和光失活
DOI：
10.1021/acs.langmuir.7b04096
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
M. Kondo
中科院分区：
文献类型：
--
作者：
N. Kawatsuki;S Inada;R Fujii;M. Kondo
原位形成N-亚苄基苯胺（NBA）侧基，实现了苯醛（PA）和苯甲酸（BA）侧基掺杂4-甲氧基苯胺（AN）分子的光惰性共聚物的光诱导协同重定向。由于 NBA 部分的轴选择性光反应，产生了侧基的热刺激分子重新取向。在共聚物薄膜上选择性涂覆 AN，在所需区域形成 NBA 部分，从而形成光致双折射图案。此外，长时间高温后退火实现了重新取向薄膜的光失活，并用AN重新涂覆形成NBA实现了重新取向结构的多重双折射图案和重新图案化。由于BA侧基的存在，NBA的缓慢热水解比侧基的热刺激自组织慢50倍，这有助于重新取向膜和多重双折射图案的光耐久性。
In situ formation ofN-benzylideneaniline (NBA) side groups achieved photoinduced cooperative reorientation of photoinactive copolymers with phenylaldehyde (PA) and benzoic acid (BA) side groups doped with 4-methoxyaniline (AN) molecules. Thermally stimulated molecular reorientation of the side groups was generated due to the axis-selective photoreaction of the NBA moieties. Selective coating with AN on the copolymer film formed NBA moieties in the desired region, resulting in a photoinduced birefringent pattern. Additionally, postannealing at an elevated temperature for a long time attained photoinactivation of the reoriented film, and recoating with AN to form NBA achieved the multiple birefringent patterns and repatterning of the reoriented structures. The slow thermal hydrolysis of NBA, which was 50 times slower than the thermally stimulated self-organization of the side groups due to the presence of BA side groups, contributed to the photodurability of the reoriented film and multiple birefringent patterns.