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Synthesis and Characterization of PEG Polymer Brushes via Cyclopolymerization of 1,2,3-Triazole Tethered Diacrylates
Xiao-ying Zhao,He-wen Liu*
Author NameAffiliationE-mail
Xiao-ying Zhao Key Laboratory of Soft Matter Chemistry, Chinese Academy of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
He-wen Liu* Key Laboratory of Soft Matter Chemistry, Chinese Academy of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China lhewen@ustc.edu.cn 
Abstract:
Poly(ethylene glycol) (PEG) macromolecular brushes were synthesized directly via re-versible addition-fragmentation chain transfer polymerization cyclopolymerization of diacry-late monomers bearing PEG functional groups through the formation of 11-member rings. The diacrylate monomers bearing PEG functional groups are the 1,2,3-triazole-tethered di-acrylate macromolecular monomers with different PEG lengths synthesized via the so-called “click” chemistry. The bulky hindrance of PEG chains affected the polymerization behavior of the diacrylate macromolecular monomers, and the diacrylate monomers showed strong tendency to cyclopolymerization rather than crosslinking. NMR analysis and gel perme-ation chromatography profiles proved the high e ciency of cyclopolymerization without side reactions. The aqueous solutions of the obtained PEG macromolecular brushes were fluores-cent under UV excitation. The uorescence depended dramatically on the concentration of brush-like polymers due to the aggregation of cyclopolymer in water, and could be quenched by the addition of DNA.
Key words:  Cyclopolymerization, Macromolecular brush, Fluorescence quenching, DNA
FundProject:
1,2,3-三氮唑基团连接的双丙烯酸酯单体环聚合形成PEG聚合物刷的合成及表征
赵晓颍,刘和文*
摘要:
通过带有PEG官能团的双丙烯酸酯大分子单体的RAFT环聚合反应合成含有十一元环重复结构的PEG大分子刷.不同PEG长度的连接1,2,3-三氮唑的双丙烯酸酯大分子单体通过点击化学反应合成.PEG侧链的较大位阻效应影响双丙烯酸酯大分子单体的聚合行为,以致于双丙烯酸酯大分子单体优先进行环化聚合反应而不发生交联反应.核磁数据和凝胶渗透色谱证明高效的环化聚合反应,而且没有副反应发生.PEG大分子刷在紫外光激发下有较强的荧光,而荧光则强烈依赖于聚合物刷的浓度,这归因于环聚合物在水中的聚集.PEG大分子刷的荧光能被DNA淬灭.
关键词:  环化聚合,大分子刷,荧光淬灭,DNA
DOI:10.1063/1674-0068/28/cjcp1504077
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