DTA and DSC study on the effect of mechanical dispersion on poly(tetrafluorethylene) properties

Abstract

Abstract Poly(tetrafluorethylene) particles were obtained by mechanical processing of the formed polymer (Teflon bar). In order to assess the effect of mechanical wear on polymer properties, their melting and crystallization behaviour was investigated by DSC and DTA, and the results were compared to the ones obtained for the native polymer. An increase of the crystallinity degree and an accentuated decrease of the average molecular weight were found for the samples submitted to mechanical wear, as a result of mechanical degradation of the polymer