离子液体由于其溶解能力强、不挥发等特点,使其成为良好的绿色溶剂,由于良好的高温稳定性,适用于缩聚反应体系.以常规的芳香族二酐和芳香族二胺为单体,并分别使用不同结构的离子液体为溶剂,进行缩聚反应得到聚酰亚胺.用红外光谱(FT-IR)和核磁共振(~(13)C-NMR)方法证实了在离子液体中所合成的聚酰亚胺与传统合成路线合成的具有相似的化学结构;采用X射线衍射(WAXD)分析了聚合物的聚集态结构,并探讨了不同的离子液体对聚酰亚胺聚集态结构的影响;经热重法(TGA)测试分析,在以离子液体[BMIM]BF_4为反应溶剂时,所得聚酰亚胺具有较好的热稳定性能.
Ionic liquids (ILs) are now becoming the novel reaction media due to its strong dissolve ability, extremely low volatility and excellent thermal stability. In this paper, three ILs were synthesized and used as solvents to produce polyimides. The chemical structures of ILs had an influence on the inherent viscosities of the high performance polymers. Fourier transform infrared spectrum(FT-IR) and nuclear ~(13)C magnetic resonance spectrum (~(13)C-NMR) were employed to confirm that the structures of polyimides synthesized in ILs, similar to one synthesized by the traditional method. The effect of ILs' nature on the crystalline property of the polyimides was investigated by wide angle X-ray diffraction (WAXD). The determination of the thermogravimetric analysis(TGA) shows that the polyimides has better thermal stability which obtained in the reaction media of [BMIM]BF_4 than other polymers.
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