碳纳米管改性的双马来酰亚胺树脂力学性质的分子尺度模拟研究

双马来酰亚胺树脂是高性能碳纤维复合材料的新型基体材料,在航空航天等领域具有广泛的应用。目前,相关材料的改性技术、制备工艺以及材料性能等考察仍以实验为主,数值模型及相应的分析方法则相对较少。本文构建了4,4′—二苯甲烷双马来酰亚胺(BDM)和二烯丙基双酚A(DABPA,固化剂)的分子尺度数值模型,实现了与实验过程基本一致的交联反应过程,考察了BDM/DABPA树脂材料的力学性质以及由碳纳米管填充所引起的强化规律和机理。结果表明,树脂材料的力学性质随着交联程度的提高而增加,而短碳纳米管的掺杂也可以进一步增强力学性质。研究工作为基于双马树脂的复合材料设计构建了数值分析技术,为相关材料的性能改进从微观层次提供了有价值的参考。

The molecular simulation on the mechanical property of the bismaleimide resin modified by carbon nanotubes

The bismaleimide resin is a novel matrix material for high-performance carbon fiber composites,which have wide applications in the aeronautic,astronautic engineering and the other fields.Nowadays,the evaluations of the modification technique,the preparation technology,the material performance,etc.,of the relevant materials mainly depend on experimental methods,and the numerical models and the relevant algorithms still lack.In this work,the molecular models of 4,4''-diphenylmethane bismaleimide (BDM) and the diallyl bisphenol A (DABPA,curing agent) are constructed,and the cross-linking reaction which is consistent with the experimental process is also achieved.The mechanical property of the BDM/DABPA resin and the corresponding change induced by filling with the carbon nanotubes are examined,respectively.The results indicate that the mechanical property of the bismaleimide resin increases with the increase in the degree of cross-linking,which could also be further enhanced by filling with the carbon nanotubes.The present work establishes a numerical method for the composites design based on the bismaleimide resin,and the findings provide a valuable reference for the modification of the relevant materials from the microscale level.