首先,采用具有非对称结构的2,3,3',4'-联苯四甲酸二酐(α BPDA)、二胺以及反应性封端剂4-苯乙炔苯酐(4-PEPA)合成了分子量分别为1 500、2 500、3 500、5 000 g/mol的热固性聚酰亚胺树脂;然后,采用FTIR、XRD、DSC、DMA、TGA和流变等表征分析方法,研究了分子量与固化反应过程、聚集态结构、耐热性能、流变性能、韧性性能的关系及其影响机制.结果表明:随着分子量增加,热固性聚酰亚胺树脂的玻璃化转变温度由369℃下降至344℃;熔体最低黏度由15.5 Pa·s增加至37 090.0 Pa·s;冲击强度由25.93 kJ/m2提高到45.04 kJ/m2.增大分子量导致热固性聚酰亚胺树脂的玻璃化转变温度和工艺性能下降,但韧性提高.
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