Effect of Surface Activity of Inorganic Oxides on Mechanochemical Degradation of Poly (Vinyl Chloride) by Grinding

概要

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Effect of surface activity of inorganic oxides such as silica gel, magnesia, and γ-alumina having acid or basic sites as additives on mechanochemical degradation of poly (vinyl chloride) (PVC) Powder by mechanical grinding of the mixture of oxide-PVC in an agate mortar were investigated.<BR>The mechanochemical degradation of PVC powder during grinding was much accelerated by adding oxides than PVC alone. However, its extent was mainly affected by kinds and numbers of active sites on the surface of oxides as additives. The mechanical scission of C-C bond in PVC molecules was mainly accelerated by adding magnesia having basic sites, that of C-Cl bond was accelerated by adding silica gel having acid sites and the both mechanical scission was accelerated remarkably by adding γ-alumina having both acid and basic sites.<BR>While, the hydrogen chloride disconnected from PVC in the process of grinding was catched on the active surface of oxides. Moreover, the formation of organic radical on the surface of oxides after removal of PVC powder from ground mixture was suggested by ESR spectra and the surface property was changed into hydrophobic at the same time.
Japan Society of Colour Materialの論文