A Well-Defined Amphiphilic Polymer Conetwork from Sequence Control of the Cross-Linking in Polymer Chains

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• 作者：Chao Zhou ; Linhong Deng ; Fang Yao ; Liqun Xu ; Jian Zhou ; Guo Dong Fu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：December 10, 2014
• 年：2014
• 卷：53
• 期：49
• 页码：19239-19248
• 全文大小：507K
• ISSN：1520-5045

文摘

Well-defined amphiphilic polymer conetworks with precisely controlled number and position of cross-links were prepared by copper-catalyzed azide鈥揳lkyne cycloaddition (CuAAC) using linear polystyrene (PS) and poly(ethylene glycol) (PEG) as the building blocks. In this approach, linear polystyrene containing a specific number of bromo groups at a predetermined position of polymer chains was synthesized by multistep reversible addition鈥揻ragmentation chain transfer polymerization and chain extension using styrene and N-bromopropyl maleimide (PBMI) as the monomers. Subsequently, the bromo groups were transformed into the azido moieties via nucleophilic substitution. The well-defined linear multialkynyl PEG was prepared from PEG diglycidyl ether and propargylamine via epoxy-amine chain extension. The as-prepared PS鈥揚EG amphiphilic polymer conetworks showed unique hydrophilic and hydrophobic phase separation with a variable swelling capacity and rheological behavior in both polar and nonpolar solvents and exhibited excellent mechanical properties with increased cross-linking density.