Copolymerization of Diphenylphosphinestyrene and Isoprene Catalyzed by Half-sandwich Scandium Complex

Lu Wang; Jie Ma; Fang Guo

doi:10.11777/j.issn1000-3304.2024.24235

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Copolymerization of Diphenylphosphinestyrene and Isoprene Catalyzed by Half-sandwich Scandium Complex

Research Article | 更新时间：2025-02-27

- Copolymerization of Diphenylphosphinestyrene and Isoprene Catalyzed by Half-sandwich Scandium Complex
- Acta Polymerica Sinica Vol. 56, Issue 3, Pages: 449-456(2025)
- 作者机构：
  
  大连理工大学化工学院高分子材料系精细化工国家重点实验室大连 116024
- 作者简介：
  
  Fang Guo, E-mail: guofang@dlut.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2024.24235
  CLC：
- CSTR：32057.14.GFZXB.2024.7313
- Received：12 September 2024，
  
  Accepted：2024-10-19，
  
  Published Online：10 January 2025，
  
  Published：20 March 2025
- 稿件说明：
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王露, 马杰, 郭方. 单茂钪催化二苯基膦苯乙烯与异戊二烯共聚合的研究. 高分子学报, 2025, 56(3), 449-456

Wang, L.; Ma, J.; Guo, F. Copolymerization of diphenylphosphinestyrene and isoprene catalyzed by half-sandwich scandium complex. Acta Polymerica Sinica, 2025, 56(3), 449-456
王露, 马杰, 郭方. 单茂钪催化二苯基膦苯乙烯与异戊二烯共聚合的研究. 高分子学报, 2025, 56(3), 449-456 DOI： 10.11777/j.issn1000-3304.2024.24235. CSTR： 32057.14.GFZXB.2024.7313.

Wang, L.; Ma, J.; Guo, F. Copolymerization of diphenylphosphinestyrene and isoprene catalyzed by half-sandwich scandium complex. Acta Polymerica Sinica, 2025, 56(3), 449-456 DOI： 10.11777/j.issn1000-3304.2024.24235. CSTR： 32057.14.GFZXB.2024.7313.

摘要

研究了单茂钪催化二苯基膦苯乙烯(StPPh

)均聚合及与异戊二烯(IP)共聚合的性能，通过核磁共振波谱(NMR)、凝胶渗透色谱(GP

C)和示差扫描量热法(DSC)对所获聚合物的微观结构和热性能进行表征分析. 结果表明，单茂钪(C

)Sc(CH

NMe

)

可以高活性地催化

-StPPh

均聚合及与IP共聚合，但是无法催化

-StPPh

聚合，二苯基膦基团的位置直接影响其聚合性能. 在70 ℃甲苯溶剂中

-StPPh

聚合20 min，聚合物的收率达96%，获得的

-StPPh

均聚物具有一个高达220 ℃的玻璃化转变温度(

). 单茂钪(C

)Sc(CH

NMe

)

催化不同比例的

-StPPh

与IP共聚合15 min，共聚物收率均达92%以上，单体转化率近100%，可以通过控制加料比精确控制

-StPPh

-IP共聚物的组成. 共聚合动力学和共聚物结构分析表明，共聚合初期

-StPPh

与IP无规共聚合，聚合后期以IP聚合为主，获得共聚物含有

-StPPh

-IP连接序列和长聚IP嵌段，其中IP聚合的

cis

-1

4选择性达94%. 不同组成的

-StPPh

-IP共聚物均有2个

，源于聚IP嵌段的

约-60 ℃，源于

-StPPh

-IP连接序列的

范围98~182 ℃，随着共聚物中

-StPPh

含量的增加而提高.

Abstract

The polymerization of diphenylphosphinestyrene (StPPh

) and their copolymerization with isoprene (IP) by half- sandwich scandium complexes have been studied. The microstructure and thermal properties of the obtained copolymers were characterized by nuclear magnetic resonance (NMR)

gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) analysis. The results showed that the scandium complex (C

)Sc(CH

NMe

)

can serve as an efficient catalyst for the polymerization

-StPPh

and its copolymerization with IP

however

this scandium complex did not show activity for the polymerization

-StPPh

. The position (

-‍) of the diphenylphosphino group at the phenyl ring of the styrene unit significantly influenced the polymerization activity. The homopolymerization of

-StPPh

in toluene at 70 ℃ for 20 min afforded the

-StPPh

homopolymer possessed a glass transition temperatures (

) at 220 ℃ in 96% yield. The copolymerization of

-StPPh

and IP with different feed ratios in toluene at 70 ℃ for 15 min afforded the

-StPPh

-IP copolymers in more than 92% yield

and the conversion of two monomers were nearly 100%. The composition of

-StPPh

-IP copolymers can be controlled by changing the feed ratio of

-StPPh

to IP. The analysis of kinetics of copolymerization and structures of

-StPPh

-IP copolymers showed that

-StPPh

was randomly copolymerized with IP at the initial stage of copolymerization

after all the

-StPPh

was consumed

and the remaining IP was also polymerized. The obtained

-StPPh

-IP copolymers contained

-StPPh

-IP random sequences and long

cis

-1

4-polyIP block (the selectivity of

cis

-1

4 was 94%). The

-StPPh

-IP copolymers with different compositions possessed two

. The

originating from

-StPPh

-IP random sequences increased from 98 ℃ to 182 ℃ with the increase of

-StPPh

content in the copolymers

the

originating from

cis

-1

4-polyIP block maintained about -60 ℃.

关键词

Keywords

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