Abstract
Abstract PVC compounds with surface-treated CaCO3 were prepared and irradiated by 60Co γ-rays under nitrogen atmosphere and in the presence or absence of trimethylol propane trimethacrylate (TMPTMA). Samples without TMPTMA did not respond to irradiation. The mechanical properties of other samples, such as tensile strength, yield strength, and % elongation, were affected and one was found to be most sensitive to irradiation. Lower values of Young's modulus were observed for samples irradiated in air compared with samples irradiated in nitrogen at lower doses, indicating the effect of atmosphere in the range of irradiation studied. Mechanical properties and the T g were not affected by the presence of filler because of weak adhesion at the polymer-filler interface. Inverse gas chromatography showed both the CaCO3 and the PVC to be acids, accounting for these observations. The weak interaction also explains the lower values of Young's modulus for samples using surface-treated CaCO3 as compared with uncoated ...
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