PVP/FF复合纳米纤维的制备与表征

采用静电纺丝技术制备了聚乙烯吡咯烷酮/二苯基丙氨酸(PVP/FF)复合纳米纤维;考察了FF含量、纺丝液流速对电纺纤维形貌及其平均直径的影响;利用扫描电镜对纤维表面形态进行了观察,通过X射线衍射和热重分析考察了纳米纤维中FF的存在状态及纳米纤维的热稳定性;通过全反射红外光谱分析了FF与PVP之间的相互作用。结果表明:当复合纤维中FF质量分数小于2%时,共混溶液的可纺性较好;复合纳米纤维直径随着FF含量的增大而先减小后增加,当FF的质量分数增加到5%时,复合纳米纤维的直径也相应增大;随着纺丝液流速的增大,复合纳米纤维的直径有逐渐增大的趋势,当纺丝液流速在0.2～0.6mL/h时,复合纳米纤维形貌较佳,纤维直径分布均匀,表面光滑无颗粒;PVP/FF复合纳米纤维中FF与PVP发生复合作用处于分散的无定形状态,分解温度范围变宽;FF与PVP之间具有良好的相容性。

Fabrication and characterization of PVP/FF composite nanofibers

A polyvinylpyrrolidone/diphenylalanine(PVP/FF) composite nanofiber was prepared by electrospinning process.The effects of FF content and spinning solution flow rate on the morphology and average diameter of electrospun fiber were investigated.The surface morphology of the nanofibers was observed by scanning electron microscopy.The physical status of FF in the nanofibers and the thermal stability of the nanofibers were investigated by X-ray diffraction analysis and thermogravimetric analysis.The interaction between FF and PVP was analyzed by attenuated total reflection infrared spectroscopy.The results showed that the blend solution had fairly good spinnability when the mass fraction of FF was less than 2%;the nanofiber diameter firstly decreased and then increased with the increase of FF content but increased when the mass fraction of FF was increased to 5%;the nanofiber diameter gradually increased with the increase of the flow rate of spinning solution and the favorable nanofiber morphology was obtained with uniform diameter distribution and smooth surface with no particles at the flow rate of 0.2-0.6 mL/h;the decomposition temperature range was broadened as compound effect occurred between FF and PVP molecules which remained in the dispersed amorphous state in PVP/FF nanofiber;and FF was well compatible with PVP.