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动态力学分析(DMA)、溶度参数法、聚合物混合焓法对聚偏氟乙烯(PVDF)和左旋聚乳酸(PLLA)的相容性分析结果显示,随着共混体系中PLLA的增加,PVDF和PLLA之间的相容性变差。扫描电镜(SEM)、广角X-射线衍射(WAXD)和拉伸实验对共混膜中PVDF/PLLA配比对其微观结构和力学性能影响的分析结果显示,随PLLA含量从10%增加到50%,共混膜由均匀致密结构变为存在缝隙的多孔结构,共混膜结晶度增加,断裂伸长率下降,断裂强度先增加后下降,在PLLA含量为40%时,强度达到最大。
The results of dynamic mechanical analysis (DMA), solubility parameter method and compatibility of polymer mixed enthalpy method to polyvinylidene fluoride (PVDF) and poly (L-lactic acid) (PLLA) showed that with the increase of PLLA in the blends, Compatibility between PVDF and PLLA deteriorates. The results of scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD) and tensile test on the microstructure and mechanical properties of the blend membranes showed that with the increase of PLLA content from 10% to 50 %. The blend membranes changed from uniform and compact structure to the porous structure with gaps. The crystallinity of the blend films increased, the elongation at break decreased, the breaking strength first increased and then decreased, and reached maximum at the PLLA content of 40%.