摘要
采用熔体拉伸方法制备了聚丙烯(PP)/聚乙烯(PE)双层共挤薄膜,在相同加工条件下,通过采用不同熔体流动速率(MFR)的聚丙烯原料与相同聚乙烯匹配共挤出,探究了熔体流动速率对双层共挤薄膜的界面粘接性能影响,并且,对后续界面形貌和撕裂性能进行测试.结果表明,当PP和PE的熔体流动速率差值(△MFR)为1.3时,双层共挤薄膜的界面剥离力提高至(1 172.4±30.7)mN,界面内侧缠结结构增多,内侧表面粗糙度提高至(18.7±1.7);相应的双层薄膜具有较高的撕裂强度,其值为(1.29±0.19)kN/m,撕裂后无明显的微观分层现象,穿刺性能提高.研究结果表明,通过控制熔体流动速率差可以实现不相容树脂的界面粘接,为新型多层共挤膜的开发提供研究基础.
Abstract
Polypropylene(PP)/polyethylene(PE)bilayer co-extruded films were prepared by melt stretching method.The effects on the interfacial adhesion of the bilayer co-extruded films were investigated by co-extrusion of polypropylene with different Melt Flow Rate(MFR)and the same polyethylene under the same processing conditions.And the interfacial inner morphology and tearing performance were studied.Result showed that when the Melt Flow Rate difference(△ MFR)of PP and PE was 1.3,the interfacial adhesion of the double-layer co-extruded film increased to(1 172.4±30.7)mN and the inner surface roughness increased to(18.7±1.7)with the interfacial inner entanglement structure increasing;The corresponding double-layer film had high tear strength,the value was(1.29±0.19)kN/m with no obvious microscopic delamination after tearing,and improved puncture performance.The results showed that the interfacial adhesion of incompatible resins could be achieved by controlling the Melt Flow Rate difference,providing a research basis for the development of new multilayer co-extruded films.
维普
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