Copolymerization of ethylene with styrene catalyzed by a scandium catalyst†,Polymer Chemistry

当前位置： X-MOL 学术 › Polym. Chem. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Copolymerization of ethylene with styrene catalyzed by a scandium catalyst†
Polymer Chemistry ( IF 4.1 ) Pub Date : 2018-08-25 00:00:00 , DOI: 10.1039/c8py00889b
Shihui Li _{1,

2,

3,

4,

5} , Meiyan Wang _{4,

5,

6,

7,

8} , Dongmei Cui _{1,

2,

3,

4,

5}

Affiliation

Copolymerization of ethylene (E) and styrene (St) was successfully achieved by using a scandium catalyst to produce a series of pseudo-random copolymers. The incorporation content of the St monomer could be tuned from 16.1 mol% to 43.2 mol% swiftly through varying the St to E feeding mole ratio and polymerization time. The highest St content in the copolymer is lower than 50 mol% even at a feeding mole ratio as high as St : E = 31 : 1 due to the steric hindrance around the active metal center. This is consistent with the monomer reactivity ratios of r_E = 14.7 and r_st = 0.0036 calculated according to the Fineman–Ross equation. This catalytic performance was extended to other styrene derivatives, such as 4-methylstyrene, 4-tert-butylstyrene, 4-isopropenestyrene, 4-vinylphenyl dimethylsilane and 4-phenylethynylstyrene. The resulting E–St copolymers have no consecutive St sequences and show only one glass transition temperature varying from −21.2 °C to 18.2 °C with the St content. DFT simulation reveals the copolymerization mechanism.

中文翻译：

a催化剂催化乙烯与苯乙烯的共聚合†

乙烯（E）和苯乙烯（St）的共聚是通过使用catalyst催化剂生产一系列伪无规共聚物而成功实现的。通过改变St与E的进料摩尔比和聚合时间，可以快速地将St单体的掺入量从16.1mol％调节至43.2mol％。由于活性金属中心周围的空间位阻，即使在高达St∶E ＝ 31∶1的进料摩尔比下，共聚物中最高的St含量也低于50mol％。这与根据Fineman-Ross方程计算的r _E = 14.7和r _st = 0.0036的单体反应率是一致的。该催化性能扩展到其他苯乙烯衍生物，例如4-甲基苯乙烯，4-叔丁基-丁基苯乙烯，4-异丙烯苯乙烯，4-乙烯基苯基二甲基硅烷和4-苯基乙炔基苯乙烯。所得的E–St共聚物没有连续的St序列，并且仅显示出一个玻璃化转变温度，范围为-21.2°C至18.2°C，且含有St含量。DFT模拟揭示了共聚机理。

更新日期：2018-08-25

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11