Reversible addition-fragmentation chain transfer polymerization of vinyl chloride controlled by xanthate

SHEN Jianmiao1 HUANG Zhihui1 BAO Yongzhong1

(1.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, China 310027)

【Abstract】Three xanthates with different structures were prepared and employed in vinyl chloride (VC) solution and miniemulsion polymerizations as reversible addition-fragmentation chain transfer (RAFT) agents. It was found that VC polymerization could be well controlled by using O-ethyl-S-(1-ethoxycarbonyl)ethyl dithiocarbonate as the RAFT agent. The rate of VC RAFT miniemulsion polymerization was obviously higher than that of RAFT solution polymerization, and the conversion of VC was higher than 90% for the miniemulsion polymerization running for 12 h, while the molecular weight distribution of poly(vinyl chloride) (PVC) prepared by RAFT miniemulsion polymerization was wider than that of PVC prepared by RAFT solution polymerization. The 1H NMR and UV-Vis absorption spectroscopy analysis of PVC-xanthate proved the presence of chain-end functional groups and the absence of structural defects. PVC-xanthate could be further used as macro-RAFT agent for VC and vinyl acetate polymerization, to prepare chain extended PVC and poly(vinyl chloride)-b-poly(vinyl acetate) copolymer, respectively. Combined with polymerization kinetics study, the living characters of xanthate-mediated solution and miniemulsion polymerizations of VC were verified.

【Keywords】 polymer; synthesis; kinetics; vinyl chloride; reversible addition-fragmentation chain transfer polymerization; xanthate;

【DOI】

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(Translated by WANG YX)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 11, Pages 4848-4855+4929

November 2018

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Article Outline

Abstract

  • Introduction
  • 1 Experimental section
  • 2 Results and discussion
  • 3 Conclusion
  • References