Study On Properties Of High-Barrier Composite Film Of Carbon Dioxide-Propylene Oxide Copolymers

As people living standard and consumption level is increasing day by day, theplastic packaging are increasingly demanding high performance, multi-function andenvironmental friendly. Among them, high barrier property as the main functions ofhigh polymer material packaging, is becoming more and more attention by the people,and got rapid development. The traditional block materials are non-biodegradablematerials will use a lot of damage to our survival environment pollution.Ever since the copolymerization of carbon dioxide with epoxides could formaliphatic polycarbonates using organometallic compounds as catalysts, and since thenmuch progress has been made to synthesize various carbon dioxide based copolymers,among which poly(1,2-propylene carbonate)(PPC), an alternating copolymer of CO2and propylene oxide (PO), had been reported having relatively good gas barrierproperty and potential wide range applications. The main works and results are listedas follows:1. Through the three-tier co-extrusion blow molding process, the preparation of theEcoflex/PPC/PBS three layers of completely biodegradable composite membraneand the blocking performance and mechanical performance test, oxygen throughabout61(cm3/m2/24h/0.1MPa), tensile strength is30.9MPa, the elongation atbreak is220%.2. Study the PPC and ethylene-the compatibility of dilute copolymer (POE),polyethylene (PE) and PPC composite film to provide basic basis.Through the three-tier co-extrusion blow molding process, the preparation of thePE/PPC/PE three-layer composite film and the blocking performance and mechanicalperformance test, oxygen through about70(cm3/m2/24h/0.1MPa), tensile strength of34.9MPa, the elongation at break was557%, the peel strength1.9N/cm.