SYNTHESIS AND MICROSTRUCTURE STUDY OF ISOPRENE/METHYL METHACRYLATE BLOCK COPOLYMER BY RARE EARTH CATALYSTS

ZHENG Ronghua; ZHANG Yifeng; SHEN Zhiquan

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SYNTHESIS AND MICROSTRUCTURE STUDY OF ISOPRENE/METHYL METHACRYLATE BLOCK COPOLYMER BY RARE EARTH CATALYSTS

Research Article | 更新时间：2021-03-19

- SYNTHESIS AND MICROSTRUCTURE STUDY OF ISOPRENE/METHYL METHACRYLATE BLOCK COPOLYMER BY RARE EARTH CATALYSTS
- Acta Polymerica Sinica Issue 1, Pages: 107-112(1999)
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- Published：20 February 1999，
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ZHENG Ronghua, ZHANG Yifeng, SHEN Zhiquan. SYNTHESIS AND MICROSTRUCTURE STUDY OF ISOPRENE/METHYL METHACRYLATE BLOCK COPOLYMER BY RARE EARTH CATALYSTS. [J]. Acta Polymerica Sinica (1):107-112(1999)
DOI：

ZHENG Ronghua, ZHANG Yifeng, SHEN Zhiquan. SYNTHESIS AND MICROSTRUCTURE STUDY OF ISOPRENE/METHYL METHACRYLATE BLOCK COPOLYMER BY RARE EARTH CATALYSTS. [J]. Acta Polymerica Sinica (1):107-112(1999) DOI：

摘要

用稀土催化剂ＲＥ（Ｐ２０４）３（ｉ-Ｂｕ）３Ａｌ-ＢｒＣＨ２ＣＨ２Ｂｒ（ＲＥ＝Ｎｄ

Ｐｒ

Ｙ等）合成嵌段共聚物Ｐ（ＩＰ-ｂ-ＭＭＡ）．系统考察了共聚合反应特征

以ＤＳＣ

１Ｈ-ＮＭＲ

１３Ｃ-ＮＭＲ技术研究了该嵌段共聚物的微结构．发现以二溴乙烷为添加剂的稀土催化体系是制备Ｐ（ＩＰ-ｂ-ＭＭＡ）的良好催化剂

共聚物含２个玻璃化转变温度

分别为－７５.６℃和１２９℃

嵌段共聚物的结构规整

（ＩＰ）ｍ段以ｃｉｓ-１

４结构为主

其含量为９７％左右

３

４结构为３％左右

链节间以头-尾方式连接．（ＭＭＡ）ｎ段以间同立构为主

其含量达７４％．

Abstract

Poly(isoprene b methyl methacrylate) block copolymer has been synthesized by rare earth coordination catalysts

which are composed of rare earth 2 ethyl hexyl phosphonates RE(P 204 ) 3

triisobutyl aluminum Al( i Bu) 3 and 1

2 dibromoethane DBE .It is found that the rare earth coordination catalysts are highly active for the block copolymerization of isoprene and methyl methacrylate.The diblock copolymer prepared has been characterized by DSC

1H NMR and 13C NMR.The block copolymer has two glass transition temperatures at -75.6℃ and 129℃ corresponding to the isoprene block phase and the methyl methacrylate block phase

respectively.The microstructure of the diblock copolymer is a highly stereoregular.For the isoprene scgment in the diblock copolymer it mainly exists in the form of cis-1

4 addition.The content of cis-1

4 addition is 97% and of 3

4-addition is 3%.For the methyl methacrylatc segment it is mostly syndiotactic

which is 74% syndiotacticity

4% isotacticity and 22% heterotacticity.The n(ad) probabilities of methyl methacrylate units in the block copolymer are calculated

and it is showed that the methyl methacrylate segment obeys second order Markov statistics model.

关键词

稀土催化剂嵌段共聚物异戊二烯甲基丙烯酸甲酯

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Guangzhou Institute of Chemistry, Chinese Academy of Sciences

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