Polyimides with main-chain photosensitive groups: Synthesis, characterization and their properties as liquid crystal alignment layers
Polyimides with main-chain photosensitive groups: Synthesis, characterization and their properties as liquid crystal alignment layers
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具有主链光敏基团的聚酰亚胺：合成、表征及其作为液晶取向层的性能
DOI：
10.1016/j.eurpolymj.2008.11.038
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发表时间：
2009-03
影响因子：
6
通讯作者：
Xiaogong Wang
中科院分区：
文献类型：
--
作者：
Miaocai Guo;Xiaogong Wang
本工作合成了一系列含有主链查尔酮基团和侧链肉桂酸酯或醋酸酯基团的聚酰亚胺。在合成路线中，1，3-二氢-1，3-二氧基异苯并呋喃-5-甲酰氯分别与1，3-二(4-羟基苯基)丙基-2-烯-1-酮、1，3-bis(4-(2-hydroxyethyl)phenyl)prop-2-en-1-one，和1，3-bis(4-hydroxyphenyl)-pent-1-en-3-one-4-en，反应，合成了三种二酸酐单体。通过二酐单体与2，2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane的缩聚反应和原位亚胺化反应，制得了先驱体聚酰亚胺。聚合后，聚酰亚胺前驱体与肉桂酰氯或乙酸酐反应，引入侧基，得到最终产物。用元素分析、核磁共振氢谱、核磁共振碳谱、红外光谱、凝胶渗透色谱、热分析等方法对聚酰亚胺的化学结构和性能进行了表征。聚酰亚胺在非质子极性有机溶剂中表现出较高的热稳定性和良好的溶解性。聚酰亚胺在紫外光照射下可发生灵敏的[2+2]光环加成反应。聚酰亚胺薄膜经线偏振紫外光照射后，可以诱导5CB液晶分子在液晶盒中均匀排列。分子取向的取向能力和预倾角都取决于聚酰亚胺的化学结构。
In this work, a series of polyimides containing main-chain chalcone groups and side-chain cinnamate or acetate groups were synthesized. In the synthetic route, three dianhydride monomers were prepared by the reactions of 1,3-dihydro-1,3-dioxoisobenzofuran-5-carbonyl chloride with 1,3-bis(4-hydroxylphenyl)prop-2-en-1-one, 1,3-bis(4-(2-hydroxyethyl)phenyl)prop-2-en-1-one, and 1,3-bis(4-hydroxyphenyl)-pent-1-en-3-one-4-en, respectively. The precursor polyimides were obtained by the polycondensation of the dianhydride monomers with 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and the in situ imidization. After the polymerization, the final products were obtained by introducing the side groups through the reactions of the polyimide precursors with cinnamoyl chloride or acetic anhydride. The chemical structures and properties of the polyimides were characterized by elemental analysis,1H NMR,13C NMR, FTIR, GPC, and thermal analysis. The polyimides show high thermal stability and good solubility in aprotic polar organic solvents. The polyimides can undergo sensitive [2+2] photocycloaddition reaction upon the UV light irradiation. After irradiation with linearly polarized UV light, the polyimide thin films can induce 5CB liquid crystal molecules to homogeneously align in the liquid crystal cells. Both the alignment ability and pretilt angles of the molecular orientation depend on the chemical structures of the polyimides.
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影响因子：
3.2
作者：
T. Scheffer;J. Nehring
通讯作者：
T. Scheffer;J. Nehring
影响因子：
2.8
作者：
T. Mihara;Y. Nakao;N. Koide
通讯作者：
T. Mihara;Y. Nakao;N. Koide
影响因子：
3.9
作者：
Seungwoon Lee;Sang Il Kim;Byeongdu Lee;Hak Chul Kim;T. Chang;M. Ree
通讯作者：
Seungwoon Lee;Sang Il Kim;Byeongdu Lee;Hak Chul Kim;T. Chang;M. Ree
影响因子：
29.4
作者：
Hai-wen Gu;P. Xie;De-yan Shen;Peng-Fei Fu;Jian-Min Zhang;Zhongrong Shen;Yongxin Tang;L. Cui;Bin Kong;Xian-Fu Wei;Qiang Wu;F. Bai;Rong-ben Zhang
通讯作者：
Hai-wen Gu;P. Xie;De-yan Shen;Peng-Fei Fu;Jian-Min Zhang;Zhongrong Shen;Yongxin Tang;L. Cui;Bin Kong;Xian-Fu Wei;Qiang Wu;F. Bai;Rong-ben Zhang
DOI：
10.1201/9781351075909
发表时间：
1989-09
期刊：
--
影响因子：
--
作者：
J. H. Lai
通讯作者：
J. H. Lai