Moisture diffusion and hygrothermal aging in bismaleimide matrix carbon fiber composites - Part I: uni-weave composites
Moisture diffusion and hygrothermal aging in bismaleimide matrix carbon fiber composites - Part I: uni-weave composites
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DOI：
10.1016/s0266-3538(02)00161-6
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发表时间：
2002-01-01
影响因子：
9.1
通讯作者：
Yee, AF
中科院分区：
文献类型：
--
作者：
Bao, LR;Yee, AF
本文系统地研究了机织双马来酰亚胺复合材料的湿扩散和湿热老化行为。将复合材料的增湿曲线与纯树脂的增湿曲线进行比较，以确定界面对吸湿的影响。纯树脂和复合材料都显示出类似的两阶段扩散行为，第一阶段和第二阶段分别受扩散和弛豫控制。当复合材料的扩散系数进行了比较，一个适当的数学模型的理论预测，它被发现，纤维基体界面上的短期水分扩散的影响不大。然而，复合材料的长期吸收受到抑制。刚性纤维-基质界面似乎限制了基质的长距离节段运动，并且在这样做时减少了在松弛控制的第二阶段中的吸水。虽然纤维-基质的结合最初非常强，但在高温下长时间的吸水最终会损坏界面并导致界面开裂。(C)2002爱思唯尔科技有限公司版权所有。
Moisture diffusion and hygrothermal aging in uni-weave bismaleimide composites were systematically studied in this research. The moisture weight gain curves of the composites were compared with those of the neat resin in order to determine the interface effect on moisture absorption. Both the neat resin and composites display similar two-stage diffusion behavior, with the first and second stages being diffusion- and relaxation-controlled, respectively. When the diffusivities of the composites were compared to theoretical predications of an appropriate mathematical model, it is found that the fiber-matrix interface has little effect on the short term moisture diffusion. However, the long term absorption is suppressed in the composites. The rigid fiber-matrix interface seems to constrain long-range segmental motions of the matrix and in so doing reduce water absorption in the relaxation-controlled second stage. Although the fiber-matrix bonding is initially very strong, prolonged water absorption at elevated temperatures eventually damage the interface and causes interfacial cracking. (C) 2002 Elsevier Science Ltd. All rights reserved.