Preparation of periodic copolymers by living anionic polymerization mechanism assisted with a versatile programmed monomer addition mode
Preparation of periodic copolymers by living anionic polymerization mechanism assisted with a versatile programmed monomer addition mode
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活性阴离子聚合机制辅助通用程序单体添加模式制备周期共聚物
DOI:
10.1016/j.polymer.2017.12.070
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发表时间:
2018-02
期刊:
影响因子:
4.6
通讯作者:
Guowei Wang
中科院分区:
文献类型:
--
作者:
Zhiwei Zhao;Hongying Shen;Kunyan Sui;Guowei Wang
Assisted by a versatile programmed monomer addition mode, the well-defined periodic Poly(styrene-per-isoprene) [Poly(St-per-Is)] copolymers are innovatively prepared by living anionic polymerization (LAP) of a general monomer pair of styrene and isoprene. For comparison, the random Poly(St-ran-Is) and diblock PS-b-PI copolymers are also synthesized. The Differential Scanning Calorimetry (DSC) analysis shows that the periodic Poly(St-per-Is) copolymers always have relatively higher glass transition temperature (Tgs) than the corresponding random Poly(St-ran-Is) analogues with the same molar ratio [St]/[Is] and close molecular weight (MW). TheTgs of copolymers follow a general tendency ofTg,Poly(St-per-Is)>Tg,PS-b-PI>Tg,Poly(St-ran-Is). The reason is rationalized to the different sequence of styrene and isoprene units arranged along the copolymers.
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