溶液缩聚法含氟化聚酰亚胺的制备及薄膜性能研究(下)

Preparation and film properties of fluorinated polyimide by solution polycondensation

本文以含三氟甲基为二胺单体,以含六氟为二酐单体合成了含邻扭结结构的新型聚酰亚胺。反应为高温溶液缩聚,反应通过常规的两阶段的过程,聚前体热酰亚胺化(酰胺酸)导致聚酰亚胺具有高的分子量。通过红外光谱(FT-IR)、核磁共振(NMR)表征手段对制备的含氟单体和相应的聚合物的结构进行了表征。该类聚酰亚胺表现出优异的溶解性能且表现出优异的热稳定性,耐温高达345℃。另外,所有的聚酰亚胺呈现良好的光学性能,透明度较高,截止波长较低。它们的聚集态特性及荧光光谱在有关化学结构的相关内容中讨论。通过被其表面与水的接触角测试,结果表明,这些含氟聚酰亚胺薄膜均具有的高疏水性,所有这些性能使其能在在光电子器件中用作透明柔性衬底。

In this paper,a new polyimide with o-twist structure was synthesized by using trifluoromethyl as diamine monomer and hexafluoro as dianhydride monomer.The reaction was a high-temperature solution polycondensation.Through the conventional two-stage process,the thermal imidization of the polymer precursor(amide acid)led to the high molecular weight of the polyimide.The structures of the fluoromonomers and the corresponding polymers were characterized by FT-IR and NMR.The polyimides showed excellent solubility and thermal stability,with a temperature resistance of 345℃.In addition,all polyimides had good optical properties,high transparency and low cut-off wavelength.Their aggregation properties and fluorescence spectra were discussed in the related content of chemical structure.By measuring the contact angle between the surface and water,the results showed that these fluorinated polyimide films had high hydrophobicity,all of which could be used as transparent and flexible substrates in optoelectronic devices.