ポリエピクロルヒドリンの熱分解機構と安定化

概要

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Effect of metal compounds on thermaloxidative degradation of polyepichlorohydrin (CHR) has been studied. FeCl3, SnCl2 and ZnCl2 accelerated both dehydrochlorination and the decrease of the molecular weight. The degradation, however, was almost completely prevented in the presence of alkaline earth oxide such as MgO. CuCl2, CoCl2 and MnCl2 accelerated the latter degradation selectively through the decomposition of hydroperoxide. On the above results and the determination of IR and Gas-mass spectra, thermal-oxidative degradation mechanism of CHR was postulated. Effect of the stabilizer on CHR-degradation was examined about respective roles of (1) acid accepter, (2) metal chelating agent, and (3) antioxidant. The best stabilizers were (1) MgO, (2) isopropylcitrate, (3) nickel dibutyl dithiocarbamate, trioctylthio-s-triazine and di-n-butyltin malate, respectively.
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