Synthesis and Characterization of Novel Copolymers with Different Topological Structures and TEMPO Radical Distributions
Synthesis and Characterization of Novel Copolymers with Different Topological Structures and TEMPO Radical Distributions
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DOI：
10.1021/acs.macromol.7b00159
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发表时间：
2017-03
期刊：
影响因子：
5.5
通讯作者：
Jiaxing Zhang;Hongying Shen;Wen-Tao Song;Guowei Wang
中科院分区：
文献类型：
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作者：
Jiaxing Zhang;Hongying Shen;Wen-Tao Song;Guowei Wang
合成了一系列具有不同拓扑结构和2，2，6，6-四甲基哌啶-1-氧自由基（克里思）分布的新型线性和超支化共聚物，并系统研究了它们的顺磁性能。基于GTEMPO、缩水甘油（Gly）或环氧乙烷（EO）单体的开环聚合（ROP）机理，分别以双官能度2，2-二甲基-1，3-丙二醇和四官能度季戊四醇为引发剂，合成了线型和超支化的Poly（EO-co-GTEMPO）共聚物。或者，从超支化聚甘油（HPG）的多官能大分子引发剂，超支化HPG-g-Poly（Gly-co-GTEMPO）和HPG-g-PGTEMPO共聚物也是目标。用GPC、DSC和UV-vis对共聚物进行了表征。通过EPR分析研究了不同浓度和温度下共聚物的顺磁性。结果表明，浓度...
A series of novel linear and hyperbranched copolymers with different topological structures and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical distributions were synthesized, and their paramagnetic property was systematically investigated. Based on the ring-opening polymerization (ROP) mechanism of GTEMPO, glycidol (Gly) or ethylene oxide (EO) monomers, the linear Poly(EO-co-GTEMPO) and hyperbranched Poly(Gly-co-GTEMPO) copolymers were obtained from a bifunctional 2,2-dimethyl-1,3-propanediol initiator and a tetrafunctional pentaerythritol initiator, respectively. Alternatively, from the multifunctional macroinitiator of hyperbranched polyglycerol (HPG), the hyperbranched HPG-g-Poly(Gly-co-GTEMPO) and HPG-g-PGTEMPO copolymers were also targeted. The copolymers were characterized by GPC, DSC, and UV–vis analysis. The paramagnetic property of the copolymers was studied and compared by EPR analysis at different concentrations of copolymers and temperatures. The results displayed that the concentrations...