無水コハク酸とオキシラン類との共重合体の合成とそれらの生分解性 (ポリマ-と環境-1-<特集>)

概要

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The ring-opening copolymerization of succinic anhydride with various oxiranes by organometalic compounds (diethyl zinc, Al<SUB>2</SUB>-Zn-μ-oxoalkoxide, and aluminium isopropoxide) and the biodegradability of the produced polymers were investigated. The initiator influenced the molecular weight and the composition of these copolymers. Random copolymers were produced by diethyl zinc. The molecular weight of these copolymers were larger than those of copolymers obtained using other initiators. Aluminium isopropoxide gave alternative copolymers of succinic anhydride with oxirane. The amount of initiator affected the molecular weight of these copolymers. The copolymers of succinic anhydride with ethylene oxide were crystalline, while the copolymers with propylene oxide were amorphous. The biodegradation values of the copolymers were evaluated by an enzymatic hydrolysis method. The aliphatic copolymers of succinic anhydride with ethylene oxide, propylene oxide or allyl glycydil ether were readily degraded by a lipase. However, the aromatic copolymers produced from succinic anhydride with styrene oxide or phenyl glycydil ether were little degraded. The degradation can be controlled by the ester content and molecular weight of these copolymers.
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