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
Guowei Wang
中科院分区:
化学2区
文献类型:
--
作者:
Zhiwei Zhao;Hongying Shen;Kunyan Sui;Guowei Wang

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在一种通用的程序单体加成方式的辅助下,通过一对普通单体对的活性阴离子聚合(LAP),创新性地制备了定义良好的周期性聚(苯乙烯-聚异戊二烯)[聚(St-PER-IS)]共聚物。作为比较,还合成了无规聚(St-RAN-IS)和两嵌段PS-b-PI共聚物。差示扫描量热(DSC)分析表明,在相同摩尔比[St]/[IS]和近分子质量(MW)的条件下,周期聚(St-Per-IS)共聚物的玻璃化转变温度(TGS)始终高于相应的无规聚(St-RAN-IS)类似物。共聚物的Tg遵循Tg,Poly(St-Per-IS)≫Tg,PS-b-PI≫Tg,Poly(St-RAN-IS)的总趋势。合理地解释了原因是苯乙烯和异戊二烯单元沿共聚物排列的顺序不同。
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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