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通过静电纺丝制备聚丙烯酸(PAA)纳米纤维膜,并以乙二醇(EG)为交联剂、硫酸(H_2SO_4)为引发剂,对制备的PAA纳米纤维膜进行热交联,以提高其在水中的稳定性。采用扫描电子显微镜对纤维的表面形貌进行表征,发现当PAA溶液质量分数为9%、交联剂EG质量分数为12%、纺丝电压为20 k V时,溶剂挥发完全,而且纤维直径分布均匀。试验还对交联温度及交联时间进行了研究,发现PAA纳米纤维膜在140℃的热处理条件下形成酯,而在150℃及以上的热处理条件下形成酯和酸酐,且上述交联反应都能在1 h内完成。
Poly (acrylic acid) (PAA) nanofibrous membranes were prepared by electrospinning. The prepared PAA nanofibrous membranes were thermally cross-linked with ethylene glycol (EG) as crosslinking agent and sulfuric acid (H_2SO_4) Stability in water. The surface morphology of the fibers was characterized by scanning electron microscopy and found that when the mass concentration of PAA was 9%, the crosslinking agent EG was 12% and the spinning voltage was 20 kV, the solvent was completely volatilized and the fiber diameter distribution Evenly. The experiment also studied the crosslinking temperature and the crosslinking time and found that the PAA nanofiber membrane forms ester under the heat treatment condition of 140 ° C. and forms esters and acid anhydride under the heat treatment condition of 150 ° C. and above, Can be completed in 1 h.