Hyperbranched Azo-Polymers Synthesized by Acyclic Diene Metathesis Polymerization of an AB2 Monomer

详细信息    查看全文

• 作者：Liang Ding ; Liya Zhang ; Huijing Han ; Wei Huang ; Chunmei Song ; Meiran Xie ; Yiqun Zhang
• 刊名：Macromolecules
• 出版年：2009
• 出版时间：July 28, 2009
• 年：2009
• 卷：42
• 期：14
• 页码：5036-5042
• 全文大小：794K
• 年卷期：v.42,no.14(July 28, 2009)
• ISSN：1520-5835

文摘

A novel hyperbranched azo-polymer was prepared by a ruthenium-based catalyst RuCl₂(PCy₃)(SIMes)(CHPh) using acyclic diene metathesis (ADMET) polymerization of an AB₂ 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 ¹H NMR spectroscopy and the values ranged from 0.57 to 0.45.