Graft copolymerization onto cellulose by ceric ion initiator system: Effects of kind of acid and irradiation with ultraviolet light
✍ Scribed by Hitoshi Kubota; Yoshitaka Ogiwara
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 354 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The effects of kind of acid and irradiation of ultraviolet light on t.he graft copolymerization of met,hyl methacrylate onto cellulose with adsorbed ceric ion were investigated. Irrespective of ultraviolet light irradiation, the amount of reduced ceric ion in the reaction systems was increased in the order HC1> HC1o4 > HNO, > H2S04, and the number of grafts formed was increased in the order > HNOa > HCl > H804. Thus, it was definitely observed that the graft copolymerization is affected by the kind of acid. Ult.raviolet light remarkably accelerated the reduction of ceric ion adsorbed on cellulose in the various acid mediums, but decreased the efficiency of graft formation. The most favorable results for the formation of grafts were obtained in the system in which HClO4 and ultraviolet irradiation was employed. A combination of H&O4 and ultraviolet irradiation resulted in the lowest per cent grafting and average molecular weight of grafts.
It was found that HzS4 characteristically dissolves out ceric ion adsorbed into an aqueous solution and accelerates the formation of homopolymer.