The stability of polyvinyl chloride materials modified with activated wollastonite in aggressive substances

Understanding the influence of aggressive substances on polyvinylchloride (PVC) materials is important for determining the optimal areas for the practical application of PVCs and predicting their durability. The influence of natural wollastonite and activation of the surface of this methyl silicate of calcium by cation-active surfactant-quaternary ammonium salts on the water and chemical resistance of PVC films was studied. The water resistance of PVC films modified with both natural and activated wollastonite was quite high, and slightly depended on the nature of the quaternary ammonium bases used to activate its surface. Modified materials were also sufficiently resistant to salt solutions and disinfectants. The largest weight loss of PVC films with wollastonite occurred when they were exposed to alcohol. The smallest change in the mass of the samples was observed for film materials with wollastonite activated by alkyl trimethylammonium chloride (ALKAPAV 161850.C) and trialkylbenzylammonium chloride (TABAС). The length of the alkyl radical of QAS influencing the properties of the boundary layer of the poly-vinylchloride matrix-wollastonite played a role. The activation of the surface of wollastonite by all the types of QASs that were studied, on the average, slightly increased the stability of the PVC films they had modified in all the aggressive liquids studied. Its contribution, in this case, introduced a greater polarity of organomodified wollastonite, which increases the efficiency of interaction at the interphase boundary.

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