Determination of small interactions in polymer composites by means of FTIRand DSC

This paper studies polymer composites formed by a polystyrene matrix (PS) a nd a block copolymer of poly(styrene-butadiene) (SBS). Two series of polyme r composites with different compositions have been prepared: the first by e xtrusion followed by injection and the second by dissolution and evaporatio n of the solvent from the injected samples. The comparison of the FTIR spec tra of the polymer composites with those simulated by addition of the spect ra of the component polymers allows the detection of differences attributed to the existence of interactions between both polymers that cause partial miscibility between them. The results obtained are corroborated by differen tial scanning calorimetry.