SYNTHESIS OF HIGH MOLECULAR WEIGHT POLYISOBUTYLENE VIA CATIONIC POLYMERIZATION AT ELEVATED TEMPERATURES

Qiang Huang; Ping He; Jue Wang; Yi-xian Wu

doi:10.1007/s10118-013-1304-x

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SYNTHESIS OF HIGH MOLECULAR WEIGHT POLYISOBUTYLENE VIA CATIONIC POLYMERIZATION AT ELEVATED TEMPERATURES

PAPER | Updated：2023-01-03

- SYNTHESIS OF HIGH MOLECULAR WEIGHT POLYISOBUTYLENE VIA CATIONIC POLYMERIZATION AT ELEVATED TEMPERATURES
- Chinese Journal of Polymer Science Vol. 31, Issue 8, Pages: 1139-1147(2013)
- Affiliations：
  
  State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  **Yi-xian Wu (吴一弦), E-mail: wuyx@mail.buct.edu.cn
- Funds：
- DOI：10.1007/s10118-013-1304-x
  CLC：
- Received：08 October 2012，
  
  Revised：2012-11-07，
  
  Accepted：12 November 2012，
  
  Published：2013-08
- Accepted：
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Qiang Huang, Ping He, Jue Wang, et al. SYNTHESIS OF HIGH MOLECULAR WEIGHT POLYISOBUTYLENE VIA CATIONIC POLYMERIZATION AT ELEVATED TEMPERATURES[J]. Chinese Journal of Polymer Science, 2013, 31(8): 1139-1147.
DOI：

Qiang Huang, Ping He, Jue Wang, et al. SYNTHESIS OF HIGH MOLECULAR WEIGHT POLYISOBUTYLENE VIA CATIONIC POLYMERIZATION AT ELEVATED TEMPERATURES[J]. Chinese Journal of Polymer Science, 2013, 31(8): 1139-1147. DOI： 10.1007/s10118-013-1304-x.

摘要

Abstract

A novel simple but effective initiating system of H

O/AlCl

/veratrole (VE) has been developed to synthesize high molecular weight polyisobutylene (PIB) at elevated temperatures via cationic polymerization of isobutylene (IB) in solvent mixture of hexane/methylene dichloride (

-Hex/CH

= 2/1

). VE played very important roles in decreasing cationicity of the growing chain ends

suppressing side reactions of chain transfer and termination during polymerization

leading to production of high molecular weight PIBs. PIBs with high yields

having very high weight-average molecular weight (

) of 1117000 and 370000 g/mol could be synthesized with H

O/AlCl

/VE initiating system at VE concentration of 5.4 mmol/L at −80 and −60℃ respectively. Molecular weight of PIB increased remarkably with increasing VE concentration. The reaction order with respect to VE concentration was determined to be −3.52

via

FTIR spectroscopy in combination with a diamond tipped attenuated total reflectance (ATR) immersion probe. The negative reaction order of VE was consistent with its retarding effect on IB polymerization by interacting with the propagating species. Molecular weight of PIB decreased with increasing polymerization temperature. The activation energy for polymerization degree (

) could be determined to be around −23 kJ/mol when VE concentration was 5.4 mmol/L or 6.4 mmol/L.

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