Graft polymerization of methyl methacrylate onto polyvinyl alcohol using Ce4+ initiator

✍ Scribed by P. Chowdhury; M. Banerjee

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 154 KB
• Volume: 70
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19981017)70:3<523::aid-app14>3.0.co;2-1

✦ Synopsis

Methyl methacrylate (MMA) was graft polymerized onto polyvinyl alcohol (PVA) using ceric ammonium sulfate as an initiator in aqueous medium. The grafting efficiency of MMA was studied as a function of monomer and initiator concentration, time, pH, and temperature. Grafting efficiency was found to be optimum at a particular level of ceric ammonium sulfate (3.16 ϫ 10 Ϫ3 mol L Ϫ1 ), PVA (1.0 g L Ϫ1 ), MMA (0.469 mol L Ϫ1 ), H 2 SO 4 (0.188 mol L Ϫ1 ), temperature (45°C), and time (4 h). The probable reasons for the influence of reaction variable on the observed trend of MMA towards grafting have been discussed. Acid hydrolysis and infrared spectroscopy were used for the confirmation of graft copolymer formation. Thermogravimetric analysis of PVA and a representative graft copolymer were studied. The solubility/swellability and the gelatinization characteristics are also reported.