乙醇后处理对静电纺聚乳酸非织造网的影响

Effect of Ethanol Post-treatment on the Characteristic of Electrospun PLA Nanofiber Web

以六氟异丙醇(HFIP)为溶剂,通过静电纺丝制得聚乳酸(PLA)纳米纤维非织造网,纤维平均直径246nm,经75%乙醇处理后,纤维之间出现了粘连现象。乙醇后处理对PLA纳米纤维非织造网红外光谱影响不大;而通过热分析计算得到的PLA纤维在处理前、纯乙醇处理后和75%乙醇处理后的结晶度分别是28.3%、33.1%和34.1%,这说明乙醇后处理改变了PLA纤维的分子聚集态结构;另外玻璃化温度、结晶温度和熔融温度都有所增大,而热分解温度从处理前的375.4℃下降到处理后的360.3℃。这些变化说明,纯乙醇和75%乙醇后处理都对PLA纤维有明显的影响,特别是对形态、结晶度和热性能参数的影响较大。

The PLA nanofiber web was prepared by electrospinning with the solvent 1,1,1,3,3,3-hexafluoro- 2-propanol （HFIP）. The average diameters of PLA nanofiber were 246 nm, after post-treatment, the fibers adhesion and fiber bifurcation were more obvious. The results of the FT-IR analysis showed that the 75 % ethanol post-treatment didn＇t affect the molecular structure of the PLA nanofiber; but the TG-DTA curve showed the crystallinity were 28.3 %, 33.1% and 34.1% respectivey before treatment and after pure ethanol 75 % ethanol treament, and the thermal discomposition temperature from 375.4 ℃ before treatment was down to 360.3 ℃after treatment. All the results suggested that the ethanol post-treatment had an obvious effect on the morphology, crystallinity and thermal property of the PLA nanofiber.