复合功能相变纳米纤维膜的制备与性能

Preparation and properties of composite functional phase change nano-fiber membrane

将聚酰胺66(PA66)与聚乙二醇(PEG)分别按10∶90、20∶80、30∶70、40∶60的比例混合,并以甲酸为溶剂配制成纺丝液,采用静电纺丝法在铝箔上聚集12 h后制得厚度均匀的纳米纤维膜,对膜表面的微观结构及纤维直径进行分析,并测试了膜的力学性能、热学性能及其分子结构。研究结果表明:当PA66含量较小时,纳米纤维表面附着的颗粒状物质较少,纳米纤维直径较粗,表面较光滑;纳米纤维复合膜在1 515.5 cm^(-1)和1 642 cm^(-1)处出现双吸收峰,在3 078~3 082 cm^(-1)存在弱吸收峰;纳米纤维复合膜拉伸断裂强度和断裂伸长率均小于纯PA66纳米纤维膜,纳米纤维复合膜的热分解过程由PEG和PA66的熔融过程放热组合而成,当PA66与PEG的混合比例为10∶90时,残留物在210℃~310℃时分解速度很快。

Electro-spinning solution is prepared with the mixture of PA66 and PEG with ratio of 10 ： 90,20 ： 80,30 ： 70,40 ： 60 respectively and formic acid as solvent, and then the nanofiber film with uniform thickness is made with electro-spinning method through gathering for 12 hours on the foil. The surface microstructure and fiber diameter are analyzed and the mechanical properties, thermal properties and molecular structure are tested. The results show that when the content of PA66 is small, the number of nano-particulate matter adhered on the nanofiber＇ s surface reduces, the diameter of the nanofiber becomes big, and the surface of the fiber is very smooth. The composite nanofiber film has the double absorption peaks at 1 515.5 cm^-1 and 1 642 cm^-1 and weak absorption peak at 3 078- 3 082 cm^-1. The tensile strength and tensile elongation of composite nanofiber film are less than those of pure PA66 nanofiber film. The thermal decomposition process of composite film is composed of the exothermie combination of PEG and PA66 melting process. When the mixed ratio of PA66 and PEG is 10 ： 90, the decomposition rate of the residues is very fast at 210℃ -310℃.