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放射線橋かけ技術による柔らかく弾力性のあるポリ乳酸の開発

Modification of elastic poly(lactic acid) by radiation-induced crosslinking

長澤 尚胤; 玉田 正男; 金澤 進一*; 早崎 俊克*

Nagasawa, Naotsugu; Tamada, Masao; Kanazawa, Shinichi*; Hayasaki, Toshikatsu*

ポリ乳酸に橋かけ剤であるトリアリルイソシアヌレートを5phr濃度添加して、電子線で橋かけした。橋かけしたポリ乳酸分子の網目中に可塑剤を保持させることにより、室温で柔らかく、変形しても元の形状に戻る弾力性のある透明なポリ乳酸材料を創り出すことに成功したので、その作製法及び物性について解説した。

Poly(lactic acid), PLA was irradiated using electron beams in the presence of triallyl isocyanurate at 5 phr concentration as crosslinking agent. The crosslinked PLA, of which heat resistance was improved, is applied on flexible and elastic materials by addition of plasticizer or immersion in plasticizer. The elastic PLA material has several advantages such as high holding plasticizer, heat resistance at 80 $$^{circ}$$C and transparency. It is therefore proven that crosslinking technology is beneficial to expanding application of soften PLA.

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