Development of Reactive blend with supercritical carbon dioxide

摘要

A reactive extrusion process for immiscible PP/PS blend with peroxide and, multifunctional agent in the presence of supercritical carbon dioxide was studied. Supercritical carbon dioxide was used in reactive extrusion to assist the diffusion of the agent into polymer matrix. The PP/PS blends were investigated by rheological measurement,scanning electron microscopy and thermal property. The results indicate that the complex viscosity and the storage modulus of the blend are increased by adding peroxide and a multifunctional agent, which may represent the formation of copolymer during melt processing. Moreover, analysis of the products revealed that the use of supercritical carbon dioxide led to improved compatibility. These results were also confirmed by checking the size reduction of dispersed PS phase. From the results of the rheological and morphological studies, it was suggested that the compatibility of the PP/PS blend increased by reactive extrusion assisted by supercritical carbon dioxide.