The New Formation Control Technique of Percolated Structure of Polybutadiene-Polystyrene Blend Polymer using Supercritical Carbon Dioxide

摘要

The new formation control technique of polybutadiene -polystyrene blend polymer was developed by using supercritical (SC) carbon dioxide mixtures containing organic solvent, such as benzene, toluene and p-xylene. During the solvent casting process, SC fluid mixtures which have large diffusivity were used as functional solvent for blend polymer under the condition of 20 MPa at 308.15 K. SC fluid could cause much larger degassing rate of solvent than casting process routinely used under reduced pressure. The large degassing rate made the periodic distance of the percolated structure of blend polymer small. And the percolated structure of blend polymer was observed by an optical microscope. The periodic distance of the percolated structure was measured during the casting process by the laser light-scattering method. It was found that the periodic distance of percolated structure obtained by using SC fluid is smaller than that of the routine casting process and the periodic distance of blend polymer decreased with an increase in the degassing rate of organic solvent.