生分解誘引剤を含有するLDPEの開発と生分解性評価研究

概要

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Our previous studies have elucidated that the degradation of LDPE in the soil proceeds synergistically by usual oxidative degradation and by enzymatic oxidative degradation. Thus it was expected that the addition of oxidizing agents which will be called as the biodegradation inducing agent, and the improvement of the accessibility of bacteria by the surface treatment of LDPE such as UV irraditation promote the biodegradation of LDPE. In this paper, we examined the effect of several biodegradation inducing agents by compounding them in LDPE and by burying the polymer in bioactive coppice soil for 12 month. Following results have been obtained: 1, The addition of vegetable oil promoted the degradation of LDPE, and the effect was more pronounced for the oxidized oil; 2, The addition of metal carboxylate such as iron stearate also promoted the biodegradation; 3, UV irradiation was very effective for the biodegradation of LDPE, and a number of hyphae which probably grew on the polymer substrate were recognized by SEM observation.Moreover, it was also made clear that a large number of voids were formed and the molecular weight of LDPE decreased after burying in soil for 12 month. This means that the degradation rate was very much accelerated. Thus it was suggested that the biodegradation inducing agents such as the oxidized oil and the metal carboxylate effectively promote the biodegradation by UV irradiation.
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