China Plastics ›› 2017, Vol. 31 ›› Issue (12): 84-89.DOI: 10.19491/j.issn.1001-9278.2017.12.015

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Preparation of Poly(propylene carbonate)/Polytetrafluoroethylene Blends and Their Foaming Behaviors through Supercritical CO2

  

  • Received:2017-07-21 Revised:2017-08-08 Online:2017-12-26 Published:2017-12-29

Abstract: Poly(propylene carbonate)(PPC)/polytetrafluoroethylene(PTFE) blends were prepared by using an asymmetrical co-rotating twin-screw extruder. Dispersion of PTFE in the PPC matrix was analyzed. Then, the PPC/PTFE blending foams were prepared by using supercritical CO2 as a forming agent, and their foaming behaviors were studied. The results indicated that the dispersion of PTFE was improved significantly due to the utilization of such a new type of twin-screw extruders. PTFE could also act as a nucleating agent to reduce the cell size and increase the cell density remarkably when the blending foams were prepared. The blending foams containing 3 wt % PTFE achieved a minimum cell size of 2 μm and a maximum cell density of 4.75×107 cells/cm3.