オカラと亜麻仁油からなる生分解性機能膜の作製

概要

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Okara，a byproduct obtained during the production of tofu(bean curd) and soymilk，was refined by the successive procedures in order of dehydration, grinding to fine powder，and extracting of fats using hexane and acetone as extractant. The soybean fibro-material obtained is expressed as OKARA. OKARA was chemically modified to the industrial polymer materials by means of three methods in the view of a green sustainable chemistry (GSC). First， OKARA was converted to the acetylated OKARA (Ac-OKARA) using a mixed solvent of acetic acid anhydride and acetic acid. Second，a heterogeneous grafting of methyl methacrylate (MMA) onto OKARA and Ac-OKARA initiated with Ce^<4+> was carried out in water to give graft-copolymers，PMMA-g-OKARA and PMMA-g-Ac-OKARA. The grafting efficiency of PMMA onto OKARA and Ac-OKARA was 152 and 196％，respectively. Both grafted products have a film-forming ability and are expected as compatibilizer of natural fiber/synthetic polymer blends. Third，the reaction of Ac-OKARA and epoxidized linseed oil in the presence of borontrifluoride diethyletherate as a catalyst was also carried out in dimethylsulfoxide to give a biodegradable bio-based OKARA resin composite (Ac-OKARA-LinO). An enzymatic degradation of the composite membrane was occurred in the presence of cellulase and lipase.