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耐350℃RTM聚酰亚胺树脂及其复合材料性能

, PP. 345-352

Keywords: RTM,聚酰亚胺,复合材料,力学性能,耐热性能

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Abstract:

以苯乙炔苯酐(4-PEPA)为封端剂,异构联苯四甲酸二酐(α-BPDA)作为二酐单体,通过选择合适的二胺单体及优化配比,研制了耐温等级高于350℃,适用于RTM工艺的聚酰亚胺基体树脂HT-350RTM,选用U3160单向碳纤维织物作为增强体,采用RTM工艺制备了HT-350RTM树脂基复合材料层合板(U3160/HT-350RTM)。结果表明:HT-350RTM树脂最低黏度可达390mPa·s,在280℃下保持黏度低于1Pa·s的时间大于2h,能够满足RTM工艺的要求。经过高温固化后,HT-350RTM树脂的玻璃化转变温度为392℃,热分解温度(分解5%)高达537℃。采用RTM工艺制备的U3160/HT-350RTM复合材料层合板孔隙率仅为0.34%,室温下具有良好的基本力学性能,315℃和350℃下的力学性能保持率均高于60%,能够满足350℃工况下的长期使用要求。

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