Synthesis of Polyisoprene with Narrow Relative Molecular Mass Distribution Using Nd(OiPr)3-based Catalytic System

doi:10.3724/SP.J.1095.2014.30420

Chinese Journal of Applied Chemistry

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Synthesis of Polyisoprene with Narrow Relative Molecular Mass Distribution Using Nd(OiPr)3-based Catalytic System

WANG Feng^1,2, ZHANG Chunyu^1*, ZHANG Hexin¹, BAI Chenxi¹, ZHANG Xuequan^1*

(1.Research Center of High Performance Synthetic Rubber,Changchun Institute of
Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
2.Graduate School of the Chinese Academy of Sciences,Beijing 100049,China)

Received:2013-08-21 Revised:2013-09-17 Published:2014-06-10 Online:2014-06-10
Contact: zhang

Abstract

Abstract: The effects of chloride donor and aging temperature of neodymium isopropoxide/diisobutylaluminum hydride/chloride donor(Nd(OiPr)3/Al(i-Bu)2H/RCl) catalyst on isoprene polymerization were investigated. The resulting polymer was fully assessed by NMR, IR and GPC. Chloride donors greatly influenced the relative molecular mass distribution(MWD) of plyisoprene and only Nd(OiPr)3/Al(iBu)2H/Me2SiCl2 catalytic system could afford polyisoprene with a narrow MWD. In the Nd(OiPr)3/Al(iBu)2H/Me2SiCl2 catalytic system, the polymerization results showed that MWD of polyisoprene kept around 1.5 when the catalyst was aged at 0~50 ℃ and became much broader(MWD＞6.0) when the aging temperature was above 50 ℃. Additionally, the yield and 1,4-content of polyisopere increased with the aging temperature.

Key words: isoprene, neodymium-based catalytic system, chloride donors, aging temperature, relative molecular , mass distribution

CLC Number:

O632.1

WANG Feng1,2, ZHANG Chunyu1*, ZHANG Hexin1, BAI Chenxi1, ZHANG Xuequan1*. Synthesis of Polyisoprene with Narrow Relative Molecular Mass Distribution Using Nd(OiPr)3-based Catalytic System[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30420.

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Synthesis of Polyisoprene with Narrow Relative Molecular Mass Distribution Using Nd(OiPr)3-based Catalytic System

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