硫酸およびボールミルによるポリカーボネートの分解

概要

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In order to clarify the mechanism of the molecular chain scission of polycarbonate (PC), the pelletted and the flaky PC were decomposed by sulfuric acid, ball mill, and vibration ball mill. The degree of scission was determined by measuring the average molecular weight of PC at various stages of chain scission. In the case of the scission of PC by sulfuric acid, the reaction rate depends on the rate of diffusion of sulfuric acid aqueous solution into PC. The degradation of the pelletted PC is appreciably slow compared with that of the flaky PC. In this case, the degradation occurs at the surface of PC with the release of bisphenol A. On the other hand, the degradation of the flaky PC takes place rapidly with an increase of concentration of sulfuric acid and with an increase of reaction temperature. It was found that the degradation of PC proceeds with the random scission of weak bonds and normal ester bonds. In addition, the grinding of pelletted and flaky PC was also carried out by a ball mill or a vibration ball mill. It was found that the random scission of PC occurs at the early stage of grinding.
社団法人日本材料学会の論文
1978-03-15