Chemical structure of radiation‐induced graft copolymers of methyl methacrylate on polyvinyl alcohol
1963; Wiley; Volume: 69; Issue: 1 Linguagem: Inglês
10.1002/macp.1963.020690108
ISSN0025-116X
AutoresIchiro Sakurada, Shuji Matuzawa, Yasushi Kubota,
Tópico(s)Biopolymer Synthesis and Applications
ResumoAbstract Graft copolymerization of MMA onto PVA film was carried out using a pre‐irradiation technique with γ‐rays of Co. 60. Raw graft copolymer was obtained with percent graft of 96.1%, which was acetylated and dissolved in benzene. Fractionation of the copolymer acetate was performed using n‐butanol as a precipitant. The composition analysis and viscosity measurements were undertaken for each fraction. By saponification of each fraction, the backbone was converted back into PVA, and the PVA chain was cleaved with periodic acid. The viscosities of the acetates were compared before and after the cleaving. The results indicate that, though the apparent percent graft of raw graft copolymer is high, 96% of backbone polymer was not grafted, and all of the graft copolymers have one branch of long PMMA in one PVA molecule.
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