超临界CO2中聚氟乙烯的结构及其加工性能

Structure and processability of PVF in supercritical CO2

以超临界CO2为介质,由氟乙烯单体聚合得到聚氟乙烯(PVF),并对PVF的结构进行表征;将PVF与N,N-二甲基乙酰胺混合进行造粒,再经过挤出流延、双向拉伸制备了PVF薄膜。结果表明:制备的PVF薄膜具有良好的力学性能和水蒸气阻隔性,拉伸强度为70 MPa,断裂伸长率为95%,水蒸气透过率为19.5 g/(m^2·24 h),氧气透过率为18.5 mL/(m^2·24 h)。

Polyvinyl fluoride(PVF)was synthesized by polymerization of vinyl fluoride monomer in supercritical carbon dioxide,whose structure was characterized.PVF was mixed with N,N-dimethylacetamide to prepare PVF films through pelletizing,extrusion and casting as well as biaxial stretching.The results show that the PVF films prepared perform excellently in mechanical properties and water vapor permeation resistance,whose tensile strength is 70 MPa,elongation at break is 95%,water vapor transmission rate is 19.5 g/(m^224 h),and oxygen transmission rate is 18.5 mL/(m^224 h).