NDLI: Cationic polymerization of isobutylene coinitiated by AlCl3 in the presence of ethyl benzoate

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Cationic polymerization of isobutylene coinitiated by AlCl3 in the presence of ethyl benzoate

Content Provider	Springer Nature Link
Author	Li, Yan Wu, Yi xian Liang, Li hu Li, Yan Wu, Guan ying
Copyright Year	2010
Abstract	The cationic polymerizations of isobutylene (IB) coinitiated by AlCl3 were carried out in solvent mixture of n-hexane/methylene dichloride (n-hex/CH2Cl2) of 60/40 V/V in the presence of ethyl benzoate (EB) at various temperatures range from −80°C to −30°C. The effects of EB concentration ([EB]) and polymerization temperature on monomer conversion, weight-average molecular weight (M w) and molecular weight distribution (MWD, M w/M n) of polyisobutylene (PIB) products were investigated. The rate of polymerization decreased while M w of PIB products increased with increasing [EB]. The polymers with high molecular weight could be prepared in the presence of a suitable amount of EB. Significantly, the polymers with high M w of 80.2 × 104 and 65.4 × 104 could be produced at −80°C and −70°C at [EB] = 0.24 × 10−3 mol/L respectively, which were much higher than that (M w = 57.9 × 104) of PIB prepared at −100°C in the absence of EB. A simple but effective method for preparing the high molecular weight polyisobutylenes was developed in this work. It has been also found that the activation energy for propagation (E p) depended on the polymerization temperature range in the presence of EB. An obvious inflection of the linear plots of lnX n versus 1/T p occurred at the temperature range from −60°C to −50°C at four different concentrations of EB from 0.19 × 10−3 mol/L to 0.33 × 10−3 mol/L, and thus the inflection temperature (T inf) was in the range of −60°C to −50°C. When [EB] was in the range of 0.24 × 10−3 mol/L to 0.33 × 10−3 mol/L, E p was determined to be around −12 kJ/mol when the polymerization was carried out at temperatures from −80°C to T inf and to be around −28 kJ/mol at temperatures from T inf to −15°C respectively.
Starting Page	55
Ending Page	62
Page Count	8
File Format	PDF
ISSN	02567679
Journal	Chinese Journal of Polymer Science
Volume Number	28
Issue Number	1
e-ISSN	14396203
Language	English
Publisher	Chinese Chemical Society and Institute of Chemistry, CAS
Publisher Date	2009-12-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electron donor Cationic polymerization Isobutylene Polyisobutylene Condensed Matter Physics Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Chemical Engineering Polymers and Plastics

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