Further improvement of the macroscopic NLO coefficient and optical transparency of hyperbranched polymers by enhancing the degree of branching

被引：25

作者：

Wu, Wenbo ^{[1
]}

Li, Zhen ^{[1
]}

机构：

[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China

来源：

POLYMER CHEMISTRY | 2014年 / 5卷 / 17期

基金：

美国国家科学基金会;

关键词：

DENDRIMERS CONVENIENT SYNTHESIS; ORGANIC ELECTROOPTIC MATERIALS; POWERFUL CLICK CHEMISTRY; MAIN-CHAIN POLYURETHANES; CHROMOPHORE MOIETIES; COPPER(I) CATALYSIS; STRUCTURAL CONTROL; FACILE SYNTHESIS; MONOMERS; POLYTRIAZOLES;

D O I：

10.1039/c4py00419a

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this paper, two new second-order nonlinear optical (NLO) hyperbranched polytriazoles (HP1 and HP2) containing nitro azobenzene as the chromophore were successfully prepared, through the AB(4)-type click polymerization under copper(I) catalysis. Thanks to the AB(4)-type branched monomer, the degree of branching (DB) of HP1 was improved to 0.691, much larger than that of its analogue, HPS1 (0.457), which was derived from an AB(2)-type monomer. The solubility, optical transparency and NLO coefficient of HP1 were all improved in comparison with those of HPS1, due to the better site-isolation effect. Furthermore, pentafluorophenyl rings were utilized as isolation groups to further enhance the NLO effect in HP2, and the d(33) value and the d(33)(infinity) value of HP2 were tested to be as high as 136 pm V-1 and 28 pm V-1, respectively.

引用

页码：5100 / 5108

页数：9

共 69 条

[1] New approach to highly electrooptically active materials using cross-linkable, hyperbranched chromophore-containing oligomers as a macromolecular dopant [J].