碳纤维高温退浆处理对聚酰亚胺复合材料热老化的影响
Effect of high temperature desizing treatment of carbon fiber on thermal aging of polyimide composites
查看参考文献21篇
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文摘
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分别从复合材料热氧化失重、表面和微观形貌、力学性能和玻璃化转变温度等方面,对比研究了碳纤维退浆和未退浆两种状态的聚酰亚胺复合材料在330℃下热老化过程中的性能变化规律及机理。结果表明:碳纤维退浆可以降低聚酰亚胺复合材料的热氧化失重率。碳纤维未退浆的复合材料由于界面层含耐温性低的环氧上浆剂,在热老化过程中界面容易破坏,导致裂纹较多,边缘纤维较快发生脱离。未退浆的复合材料虽然在老化前具有较高的层间剪切强度,但在热老化前期降低较快,退浆的复合材料在200h老化后层间剪切强度反而更高。两种复合材料老化前的弯曲强度基本相当,但未退浆的复合材料在老化前期弯曲强度下降较快;退浆对弯曲模量影响不大。退浆后的复合材料玻璃化转变温度提高了15℃左右;经热老化后,未退浆的复合材料玻璃化转变温度略有提高,而退浆的复合材料基本不变。因此,对碳纤维进行高温退浆处理有利于提高聚酰亚胺复合材料在高温下长期使用的稳定性。 |
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其他语种文摘
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The performance change and mechanism of polyimide composites with carbon fiber sizing and desizing states during thermal aging at 330℃ were compared and analyzed from the aspects of thermal oxidation mass loss,surface morphology and micro morphology,mechanical properties and glass transition temperature.The results show that carbon fiber desizing can reduce the mass loss rate of thermal oxidation of polyimide composites.The interface layer of the composites with sizing carbon fiber contains epoxy sizing agent,which has low temperature resistance.Therefore,the interface is easy to be damaged in the process of thermal aging,resulting in more cracks and rapid separation of edge fibers.Although the composites with sizing carbon fiber has high interlaminar shear strength before aging,it decreases rapidly in the early stage of thermal aging.On the contrary,the interlaminar shear strength of the composites with desizing carbon fiber is higher after aging for 200h.The bending strength of the two composites before aging is basically the same,but the bending strength of the composites with sizing carbon fiber decreases rapidly in the early stage of aging; however,desizing has little effect on bending modulus.The glass transition temperature of the composites with desizing carbon fiber increases by about 15 ℃.After thermal aging,the glass transition temperature of the composites with sizing carbon fiber increases slightly,while the composites with desizing carbon fiber remain unchanged.Therefore,the high temperature desizing treatment of carbon fiber is conducive to improving the stability of polyimide composites for long-term use at high temperature. |
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来源
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材料工程
,2023,51(4):132-140 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000255
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关键词
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碳纤维
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环氧上浆剂
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聚酰亚胺
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复合材料
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热老化
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地址
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1.
中国航发北京航空材料研究院, 北京, 100095
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先进复合材料国防科技重点实验室, 先进复合材料国防科技重点实验室, 北京, 100095
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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一般工业技术 |
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基金
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中国航发自主创新专项资金项目
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文献收藏号
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CSCD:7480412
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