原位红外法研究电纺聚酰胺酸亚胺化过程

In Situ FTIR Study of the Imidization of Electrospun PAA

以均苯二酐和二苯醚二胺为原料合成聚酰胺酸（PAA）纺丝原液，通过静电纺丝法制备聚酰胺酸无纺布，利用原位红外技术研究聚酰胺酸无纺布亚胺化动力学过程，得出最优条件。结果表明，加热升温速率对亚胺化程度有重要的影响，升温速率为10℃／rain时，薄膜无法完全亚胺化；升温速率为2℃／rain时，可以实现100％亚胺化；采用快速一慢速的升温方法可以实现最优亚胺化效率。

Polyamie acid （PAA） based on 4,4-oxydianiline （ODA） and pyromellitic dianhydride （PMDA） can be electrospun into PAA nonwovens. Imidization conditions were optimized using in situ Fourier transform spectroscopy （FT- IR）. The result shows that heating rate intensively affects the imidization degree. Films can not be fully imidized at a high heating rate of 10 ~C/min. And 100% imidization degree could be achieved at lower heating rate of 2 ~C/min. Moreover, a new method of fast-slow heating rate was envisaged to realize the optimal imidization efficiency of the PAA nonwovens.