MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION*

WU Jinyuan; ZHANG Guangzhao; YANG Chaoxiong

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MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION*

Papers | Updated：2021-06-21

- MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION*
- Vol. 10, Issue 1, Pages: 61-69(1992)
- Affiliations：
  
  1. Guangzhou Institute of Chemistry, Academia Sinica,Guangzhou
  2. Academia Sinica
  3. Guangzhou
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WU Jinyuan, ZHANG Guangzhao, YANG Chaoxiong. MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION*. [J]. 10(1):61-69(1992)
DOI：

WU Jinyuan, ZHANG Guangzhao, YANG Chaoxiong. MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION*. [J]. 10(1):61-69(1992) DOI：

摘要

<,正,>, Polymerization of acrylonitrile （AN） in aqueous nitric acid initiated by polypropylene-based polyamidoxime （PPAO）-thiourea （TU） combination has been investigated. The overall rate of polymerization （R,p,） under the conditions of [TU]/[PPAO],<,0.5 molar ratio isThe molecular weights of the polymers were found to be inversely proportional to 3/2-power of nitric acid concentration and 1-power of thiourea concentration. In addition, it is independent with the concentrations of monomer and PPAO, and decreases with increasing temperature.On the basis of these experimental results, a coordination-proton transfer mechanism for the initiation was proposed and discussed.

Abstract

Polymerization of acrylonitrile （AN） in aqueous nitric acid initiated by polypropylene-based polyamidoxime （PPAO）-thiourea （TU） combination has been investigated. The overall rate of polymerization （R,p,） under the conditions of [TU]/[PPAO],<,0.5 molar ratio isThe molecular weights of the polymers were found to be inversely proportional to 3/2-power of nitric acid concentration and 1-power of thiourea concentration. In addition, it is independent with the concentrations of monomer and PPAO, and decreases with increasing temperature.On the basis of these experimental results, a coordination-proton transfer mechanism for the initiation was proposed and discussed.

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