以含有聚醚链的芳香族二元酸聚乙二醇双4-羧苯醚(PEG_n,n=1,2)和芳香族二元胺邻联甲苯胺(OT)为聚合单体,通过溶液缩聚法制备了一系列含有聚醚链的芳香族热致液晶聚酰胺(PEGOT).以红外光谱(IR)、核磁分析(NMR)对聚合物的化学结构予以确认;通过差示扫描量热(DSC)及偏光显微镜(POM)研究发现,液晶聚合物具有稳定的液晶性和典型的向列型织构,并采用X射线衍射(WAXD)、差示扫描量热(DSC)、热重分析(TGA)对聚合物的结晶性和热稳定性进行了研究,为此类热致液晶聚酰胺进一步的应用提供了重要依据.
A series of thermotropic liquid crystalline polyamides (PEGOT) with high molecular weights were synthesized by solution polycondensation of 4,4'-diamino-3,3'-dimethylbiphenyl(OT) with polyethyleneglycol bis(4-carboxyphenyl) ethers (PEGn,n = 1,2). Polymers prepared were characterized by infrared spectrum (IR) and ~1H nuclear magnetic resonance spectrum(~1H-NMR), and their expected structures were identified. These thermotropic polyamides were found to have stable nematic mesophases by differential scanning calorimetry (DSC) and polarizing microscope(POM). Moreover, their crystallinity and thermal stability were investigated with wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC) and thermogravimetry analysis(TGA). And the results of this Work can be valuable and provide a primary reference for the practical application of these thermotropic polyamides.
参考文献
| [1] | 张卓,张文熊,张伟彬.热致液晶聚酰胺与尼龙66相容原位复合材料研究[J].材料工程,2006(z1):98-101. |
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