MORPHOLOGY DEVELOPMENT OF POLYPROPYLENE/POLYAMIDE 6 BLEND MOLDED BY WATER-ASSISTED INJECTION MOLDING

摘要

Morphology development of polypropylene /polyamide 6 (PP/PA6) blend in water-assisted injection molded (WAIM) curved pipe was investigated. The blend morphology development was interpreted with the aid of stress and temperature fields within the mold cavity under melt filling and high-pressure water penetration during WAIM process. The results showed that the morphology developed at the position near the water inlet is induced mainly by the melt filling, whereas the morphology at the position near the end of water channel is mainly ascribed to the high-pressure water-assisted filling. Then the water pressure and melt temperature were investigated in terms of their effects on the morphology development of dispersed PA6 phase. It was demonstrated that higher water pressure result in more obvious deformation of the dispersed phase at the position near the end of water channel.