32年以上土壌埋没LDPE,PS,PVC,UFの生分解性の検討

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We examined effects of microbes on 4 types of polymers, PS, UF, PVC and LDPE, which were concealed for 32-37 years in a relatively highly microbial active soil. The results were that with regard to both PS and UF, no alterations were recognized. In PVC, while no change in appearance was evident, similarly as, in PS, a decrease in the amount of plasticizer and oxidative deterioration of polymer near its surface were recognized. LDPE underwent the whitening phenomenon, with both front and back surfaces of its film which had been in contact with soil crumbled, witnessing to its severe collapsing and decomposition. In parts where films were piled one upon another and so were not in contact with soil, their transparency and gloss were kept, but in samples taken near the ground surface where aerobic bacterial were active, a phenomenon of especially violent degradative decomposition was observed. In LDPE films, no existence of antioxidant was recognized at all.In FT-IR differential spectra of whitened parts and transparent parts of LDPE, existence of C=O group was recognized. Further, as similar FT-IR analyses wre made of ethyl ether extracts (low molecular weight compounds) of these two parts, the peaks of OH, OOH, and COOR appeared, with increasing amounts of C=O group. Where deterioration was very severe, the amount of C=O was small, being equal in level to that in the parts not being in contact with soil. The amount of ethyl ether extracts was twice as large in the whitened parts as in the transparent parts, suggesting that in the former, a deplymerization was in progress under the influence of microbes. This vindicated that normal LDPE was strongly affected by microbes in such a long period as more than 32 years.
日本ゴム協会の論文

32年以上土壌埋没LDPE,PS,PVC,UFの生分解性の検討

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