Degradation and initiation polymerization mechanism of α-methylstyrene-containing macroinitiators
✍ Scribed by Shan Jiang; Jianping Deng; Qiang Yu; Wantai Yang
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 499 KB
- Volume
- 120
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Abstract
Copolymers obtained from radical copolymerization of α‐methylstyrene (AMS) and glycidyl methacrylate (GMA) behave as macroinitiators, when heated in the presence of a second monomer, giving rise to block copolymers. The relevant degradation and initiation polymerization mechanism of the macroinitiators were studied. Thermal depropagation of the macroinitiators generated monomers, identified by ^1^H‐NMR, photoionization mass spectroscopy and FT‐IR. According to the results of structure analysis by GPC, ESR and NMR spectroscopy, the AMS‐GMA (head‐head) and AMS‐AMS (head‐head) bonds in the macroinitiators are easily scissored providing free radicals when the temperature is above 80°C. The radicals lead to subsequent polymerization of the second monomer, and thereby block copolymers are formed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011