PPC/PHB吹塑薄膜的相形态、力学和阻隔性能研究

Morphology, mechanical and barrier properties of PPC/PHB blow molding film

采用挤出吹塑成型制备PPC/PHB复合材料薄膜,研究薄膜的微观形态与力学性能和阻隔性能之间的关系。结果表明,薄膜的拉伸强度随着PHB含量的增大逐渐增大,薄膜的纵向拉伸强度比横向拉伸强度高,横向直角撕裂强度比纵向略高,这与薄膜沿拉伸方向发生了一定的取向有关;薄膜的水蒸气渗透系数和氧气渗透系数均随着PHB含量的增大而不断减小,表明其阻水及阻氧性能得到提高;当PHB含量为30%(质量分数)时,与纯PPC相比,复合材料薄膜的氧气阻隔性能提升了约5倍。分别采用Fricke和Nielsen理论模型预测PPC/PHB复合材料薄膜的阻隔性能,探究影响PPC/PHB共混薄膜阻隔性能的作用机制,可为高阻隔性能的PPC/PHB复合材料制备提供理论指导。

PPC/PHB film was prepared by extrusion blow molding.The relationship between morphology and properties of the film was investigated.Results show that tensile strength of PPC/PHB film increased with the increase of PHB content.The longitudinal tensile strength of the film was larger than that of the transverse direction and the transverse right-angle tear strength was slightly higher than that of the longitudinal direction.Both water vapor and oxygen permeability coefficients of the film decreased with the increasing PHB content,which indicated that the water blocking and oxygen barrier properties were improved.Oxygen permeability coefficient of PPC/PHB film with 30 wt%PHB was 5 times of that for pure PPC.Fricke and Nielsen model were used to calculate the barrier properties of PPC/PHB film and effects of morphology on barrier property for PPC/PHB films were analyzed.