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制备了一种侧链含苯乙炔基的二胺单体2,4-二氨基[4’-(4-苯乙炔基酞酰亚胺基)]二苯醚(DPED),并合成了基于2,3’,3,4’-联苯四甲酸二酐(3,4’-BPDA)和DPED的酰亚胺低聚物,通过热重分析,示差扫描量热分析,1H NMR,熔点和力学性能测试研究了DPED的结构及固化行为,低聚物和其固化物及其碳纤维增强复合材料的性能。结果表明:在主链化学结构相同的情况下,将DPED引入到分子质量约为5 000 g/mol的低聚物中,低聚物熔体粘度会有显著降低,侧链苯乙炔基含量越高,其熔体粘度越低,含侧链苯乙炔基的树脂基复合材料的压缩强度高于不含侧链苯乙炔基复合材料,其值分别为570 MPa和415 MPa。
A diamine monomer, 2,4-diamino [4 ’- (4-phenylethynylphthalimideylidene]] diphenyl ether (DPED) with side-chain phenylethynyl group was prepared, , 3 ’, 3,4’-biphenyltetracarboxylic dianhydride (3,4’-BPDA) and imide oligomers of DPED were characterized by thermogravimetric analysis, differential scanning calorimetry, 1H NMR, melting point and mechanics Performance tests investigated the structure and curing behavior of DPEDs, the properties of oligomers and their cured products and their carbon fiber reinforced composites. The results showed that when the DPED was introduced into oligomers with a molecular weight of about 5 000 g / mol under the same chemical structure of the main chain, the melt viscosity of the oligomers would be significantly reduced. High, and the lower the melt viscosity, the compressive strength of the phenolic resin composites containing side-chain phenylethynyl groups is higher than that of the phenanthrene-free composites without side chains, the values are 570 MPa and 415 MPa, respectively.