• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >MASS TRANSFER EFFECTS IN DEGRADATION OF BISMALEIMIDE MATRIX COMPOSITE
【24h】

MASS TRANSFER EFFECTS IN DEGRADATION OF BISMALEIMIDE MATRIX COMPOSITE

机译：联苯丙酰亚胺基复合材料降解过程中的传质效应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The role of mass transfer effects in degradation of carbon fiber reinforced bismaleimides was examined utilizing the concepts of Thiele modulus and effectiveness factor. Unidirectional samples were aged at 250, 260, and 270 degrees C. The weight loss rates from the three types of composite surfaces (resin covered surface, 0 degrees surface, and 90 degrees surface) were obtained from the weight loss data of different sample geometries. As observed previously, the weight loss rate from the resin covered surface showed a typical behavior for a reaction that becomes increasingly diffusion limited. The effective reaction and diffusion coefficients were obtained based on the initial and final weight loss rates, and activation energies for reaction and diffusion were also determined. The activation energy for diffusion was an order of magnitude higher than customary, indicating that phenomena other than diffusion (increase in effective surface area due to cracking) also contributed to the weight loss rate. Overall, this work illustrated the applicability of an unreacted core type model to composite degradation and the importance of accounting for the anisotropy as well as mass transfer effects in composite degradation. (C) 1996 John Wiley & Sons, Inc. [References: 13]
机译：利用Thiele模量和有效性因子的概念，研究了传质效应在碳纤维增强双马来酰亚胺降解中的作用。单向样品分别在250、260和270摄氏度下老化。从三种类型的复合表面（树脂覆盖的表面，0度的表面和90度的表面）的失重率是根据不同样品几何形状的失重数据获得的。如先前所观察到的，从树脂覆盖的表面的重量损失率显示出反应的典型行为，该反应变得越来越受扩散限制。根据初始和最终失重率获得有效的反应和扩散系数，并确定反应和扩散的活化能。扩散的活化能比常规的高一个数量级，表明扩散以外的现象（由于开裂而增加的有效表面积）也有助于减重率。总的来说，这项工作说明了未反应的核型模型对复合材料降解的适用性，以及在复合材料降解中考虑各向异性以及传质效应的重要性。 （C）1996 John Wiley＆Sons，Inc. [参考：13]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号