Well-Defined Brush Copolymers with High Grafting Density of Amphiphilic Side Chains by Combination of ROP, ROMP, and ATRP

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• 作者：Meiran Xie ; Jingya Dang ; Huijing Han ; Weizhen Wang ; Jingwei Liu ; Xiaohua He ; Yiqun Zhang
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：December 9, 2008
• 年：2008
• 卷：41
• 期：23
• 页码：9004-9010
• 全文大小：189K
• 年卷期：v.41,no.23(December 9, 2008)
• ISSN：1520-5835

文摘

This work reports a facile strategy for the preparation of a novel well-defined brush copolymer with two different grafts distributed on the same unit along the backbone via combination of three controlled polymerization methods, ring-opening polymerization (ROP), ring-opening metathesis polymerization (ROMP), and atom transfer radical polymerization (ATRP) based on the synthesis of the heterotrifunctional inimer, 2-hydroxymethyl-3-(2-bromoisobutyryloxymethyl)-5-norbornene (NBE-OH/Br). ROP of ε-caprolactone initiated by NBE-OH/Br was carried out to generate macroinimer, norbornene-graft-poly(ε-caprolactone)/Br (NBE-g- PCL/Br). The grafting-through strategy was then employed to construct the polymer backbone, poly(norbornene)-graft-poly(ε-caprolactone)/Br (PNBE-g-PCL/Br) via ROMP of the norbornene-terminated macroinimer NBE-g-PCL/Br. Finally, the grafting-from route was used for the synthesis of amphiphilic grafted brush copolymer, poly(norbornene)-graft-poly(ε-caprolactone)/poly(2-(dimethylamino)ethyl methacrylate) (PNBE-g-PCL/PDMAEMA) by ATRP of 2-(dimethylamino)ethyl methacrylate using bromo-functionalized ROMP product PNBE-g-PCL/Br as macroinitiators, containing one hydrophobic PCL graft and one hydrophilic PDMAEMA graft on each unit of the backbone.