POLYMERIC COMPOSITIONS BY THE THERMAL ANALYSIS METHOD

The change in characteristics of man-made fibres on introduction of highly dispersed fillers into them is associated with the formation of interfaces and with the action of surface forces on these boundaries. For a qualitative and quantitative estimate of the effect of the energy of interaction at the interface on the properties of the two-phase systems under examination, we have used the methods of differential thermal analysis (DTA) and thermomechanical analysis (TMA), with comparison of the data obtained with theelectrophysical properties of the compositions under study. It was of interest to follow the change in properties of filled systems in those temperature regions in which structural, phase, or chemical transformations take place, that is, in the regions of the glass point, melting point, and decomposition temperature, where the change in intermolecular interaction on introduction of technical carbon is displayed most appreciably. As objectsof study we took the following polymers: chlorinated polyvinyl chloride (CPVC), chlorine content 62.8% by wt.; a copolymer of tetrafluoroethylene with vinylidene fluoride (fluororesin 42C); and polyvinyl acetate (PVAc); these were filled with technical carbon, types PM-100V and PME-100V. The filler was introduced into acetone spinning solutions of these polymers; films were prepared by the dry method. Electrical resistance of the specimens was determined by the multielectrode method on a clamped length of I0 cm, with a VK7A instrument.