Free radical copolymerization of poly(n-butyl methacrylate) onto polychloroprene

✍ Scribed by K. S. V. Srinivasan; N. Radhakrishnan; M. Kuttalam Pillai

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 414 KB
• Volume: 37
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1989.070370609

✦ Synopsis

Synopsis
Graft copolymerization of n-butyl methacrylate onto polychloroprene was carried out in toluene using benzoyl peroxide as an initiator. The polychloroprene-g-poly( n-butyl methacrylate) was isolated from the copolymerization product by extracting with hexane. Infrared (IR) spectra and nuclear magnetic resonance (NMR) of graft copolymer showed the occurrence of grafting.Percentage of grafting and grafting efficiency calculated under different experimental conditions were discussed. "he mechanism of grafting seems to occur by chain transfer, as evidenced by a decrease in chlorine content during the experiment.
EXPERIMENTAL Materials
Polychloroprene PCP (Bayprene 321 supplied by Bayers, W. Germany) with 38% chlorine content was used. Polychloroprene was purified by dissolving in toluene and precipitating by methanol. The precipitation was carried out twice and the product was dried in vacuum at 50°C.