バイオマックス~Rの放射線照射挙動とその生分解性

摘要

Biomax~R was irradiated using electron beam (EB) or gamma-rays (r-rays) in air or vacuum at 25 ℃. Inherent viscosities, melting points, and melting enthalpies of the irradiated samples decreased with increasing irradiation dose, indicating that irradiation treatment degrades the polymer chain. The degree of chain-scission of Biomax~R irradiated with γ-rays in air was higher than that irradiated with γ-rays or EB in vacuum because of oxidative chain-scission by oxygen in air. Biodegradability of Biomax~R was promoted with increasing dose due to the decrease in crystallinity.%現在生産されている合成高分子あるいはプラスチック は，我々の日常生活全般において不可欠な材料である一 方，安定で分解し難い性質から，土壌中や海洋などでの 半永久的蓄積を引き起こすなど，環境問題に直結するデ メリットも併せ持つ．