高压静电纺丝制备聚丁烯-1纤维的形貌及晶型转变

Morphology and Polymorphic Transformation of an Electrospun Isotactic Poly(1-butene) Fibers via Electrospinning

对聚丁烯-1的环己烷溶液进行高压静电纺丝制备出聚丁烯微纳米纤维,通过光学显微镜、扫描电镜、傅里叶变换红外光谱和X射线衍射等表征手段,考察了纺丝液浓度、纺丝电压、推进速率对纤维形貌的影响,并对纺丝过程及室温陈放的聚丁烯纤维的晶型转变进行了研究。结果表明,随着纺丝液浓度和推进速率的增大,可以得到尺寸均匀的纤维,直径也随之变大;纺丝电压增大,纤维直径减小,但纤维直径分布均匀性变差。初生聚丁烯-1纺丝纤维膜的晶型为I型和II型,随着溶剂的挥发和时间延长,晶型II逐渐转变为晶型I,溶液涂覆膜初生晶型为晶型III和晶型I'。

Poly（1-butene） fibers were prepared via electro-spinning by using cyclohexane as solvent. The effects of the solution concentration, voltage, syringe rate on the fiber morphology and crystalline transformation were analyzed through the optical microscopy, scanning electron microscopy, FT-IR and X-ray diffraction. The results show that with the increase of the solution concentration and syringe rate, the average fiber diameter increases. But increasing the voltage reduces fiber diameter and increases deviation of diameters. The electrospun fibers contain metastable Form II and Form I immediately after spinning. The metastable form II gradually transforms into the stable Form I at room temperature followed the volatilization of solvents. In comparison, solvent cast films contain a mixture of form III and a small amount d form I＇.