Biodegradability of poly(3-hydroxybutyrate) film grafted with vinyl acetate: Effect of grafting and saponification

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• 作者：Yuki Wada ; Noriaki Seko ; Naotsugu Nagasawa ; Masao Tamada ; Ken-ichi Kasuya ; Hiroshi Mitomo
• 关键词：Poly(3-hydroxybutyrate) ; Radiation grafting ; Enzymatic degradation ; Saponification ; Poly(vinyl acetate) ; Poly(vinyl alcohol)
• 刊名：Radiation Physics and Chemistry
• 出版年：2007
• 出版时间：June 2007
• 年：2007
• 卷：76
• 期：6
• 页码：1075-1083
• 全文大小：454 K

文摘

Radiation-induced graft polymerization of vinyl acetate (VAc) onto poly(3-hydroxybutyrate) (PHB) film was carried out. At a degree of grafting higher than 5 % , the grafted films (PHB-g-VAc) completely lost the enzymatic degradability that is characteristic of PHB due to the grafted VAc covering the surface of the PHB film. However, the biodegradability of the PHB-g-VAc films was recovered when the films were saponified in alkali solution under optimum conditions. Graft chains of the PHB-g-VAc film reacted selectively to become biodegradable polyvinyl alcohol (PVA). The biodegradability of the saponified PHB-g-VAc film increased rapidly with time.