Hyperbranched Azo-Polymers Synthesized by Acyclic Diene Metathesis Polymerization of an AB2 Monomer
Hyperbranched Azo-Polymers Synthesized by Acyclic Diene Metathesis Polymerization of an AB2 Monomer
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DOI：
10.1021/ma900412b
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发表时间：
2009-07-28
期刊：
影响因子：
5.5
通讯作者：
Zhang, Yiqun
中科院分区：
文献类型：
--
作者：
Ding, Liang;Zhang, Liya;Zhang, Yiqun
以N，N-双（2-丙烯酸乙酯）苯胺和4-羧基-4 '-[双（2-丙烯酸乙酯）氨基]偶氮苯为原料，合成了4-十一碳烯氧羰基-4'-[双（2-丙烯酸乙酯）氨基]偶氮苯，在RuCl 2（PCy 3）（SIMes）（CHPh）催化剂作用下，通过无环二烯复分解（ADMET）聚合，制备了一种新型超支化偶氮聚合物。通过质谱、元素分析、红外光谱、紫外-可见光谱和核磁共振等手段对单体和聚合物进行了表征。所产生的聚合物的分子量在5.83和23.5 kDa之间，通过多角度激光散射-凝胶渗透色谱法（MALLS-GPC），其多分散指数在1.73至1.86之间。紫外-可见光谱表明，超支化偶氮聚合物发生了有效的光致异构化反应。支化度（DB）通过使用H-1 NMR光谱测定，并且值在0.57至0.45的范围内。
A novel hyperbranched azo-polymer was prepared by a ruthenium-based catalyst RuCl2(PCy3)(SIMes)(CHPh) using acyclic diene metathesis (ADMET) polymerization of an AB(2) monomer, 4-undecylenyloxycarbonyl-4'-[bis(2-ethyl acrylate)amino]azobenzene, which was synthesized from the esterification reaction between N,N-bis(2-ethyl acrylate)aniline and 4-carboxy-4'-[bis(2-ethyl acrylate)amino] azobenzene. The monomer and polymer were characterized by mass spectrometer, elemental analysis, IR, UV-vis, and NMR measurements. The produced polymers have molecular weights within 5.83 and 23.5 kDa, and their polydispersity indices range from 1.73 to 1.86 by multiangle laser light scattering-gel permeation chromatography (MALLS-GPC). The hyperbranched azo-polymer underwent efficient photoisomerization from trans to cis as observation in UV-vis spectroscopy. The degree of branching (DB) was determined by using H-1 NMR spectroscopy and the values ranged from 0.57 to 0.45.