论文部分内容阅读
聚偏氟乙烯(PVDF)/聚醚酰亚胺(PEI)为8/2(质量比)的混合聚合物溶解在N,N-二甲基甲酰胺(DMF)、四氢呋喃(THF)不同比例的混合溶剂中。利用静电纺丝技术制备PVDF/PEI复合纤维薄膜。通过扫描电镜(SEM)、X射线衍射(XRD)、差示扫描量热法(DSC)和拉伸实验考察THF含量对其微观结构、结晶度和力学性能的影响。结果显示:在电场力作用下,PVDF晶型由α晶型向β晶型和δ晶型转化,且随着THF含量的增加,PVDF/PEI复合纤维薄膜结晶度、拉伸强度、断裂伸长率呈现出先增大后减小。当DMF/THF质量比为7/3时,复合薄膜结晶度、断裂伸长率最大分别为31.27%、23.5327%。
A mixed polymer of polyvinylidene fluoride (PVDF) / polyetherimide (PEI) of 8/2 (mass ratio) was dissolved in N, N-dimethylformamide (DMF) Mixed solvent. Preparation of PVDF / PEI Composite Fiber Films by Electrospinning. The effects of THF content on the microstructure, crystallinity and mechanical properties were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and tensile test. The results show that under the action of electric field force, the crystal form of PVDF is transformed from α crystal to β crystal and δ crystal. With the increase of THF content, the crystallinity, tensile strength and elongation at break of PVDF / PEI composite fiber Rate showed the first increase and then decrease. When the DMF / THF mass ratio is 7/3, the crystallinity and elongation at break of the composite films are respectively 31.27% and 23.5327% respectively.