Thermal degradation study of interpenetrating polymer network based on modified bismaleimide resin and cyanate ester

Interpenetrating polymer networks (IPNs) based on different ratios of a modified bismaleimide resin (BMI/DBA) and cyanate ester (b10) have been synthesized via prepolymerization followed by thermal curing. A systematic thermal degradation study of these new BMI/DBA‐CE IPN resin systems was conducted by thermogravimetric analysis at different heating rates both in N₂ (thermal stability) and in air (thermal‐oxidative stability). The cured BMI/DBA‐CE IPN resin systems show excellent thermal stability, which could be demonstrated by 5% weight loss temperature (T_5%) ranging between 409 and 423 °C, maximum decomposition rate temperature (T_max) ranging between 423 and 451 °C, and the char yields at 800 °C ranging from 37% to 41% in nitrogen at a heating rate of 10 °C min^?1. The apparent activation energy associated with the main degradation stage of the cured BMI/DBA‐CE IPN resin systems was determined using the Kissinger method. The obtained results provide useful information in drawing correlation between thermal properties and structure. © 2003 Society of Chemical Industry     

From fundamental understanding to innovative developments of high-performance composites for aerospace application

In framework of the National Key Basic Research Program (973 Program) we focus our attention on R&D of (1) continuous enhancement of composites performance both for new generation and existing materials, (2) cost-effective manufacturing technologies, particularly resin transfer molding (RTM) in conjunction with textile technology, and (3) crashworthy composite structures in design, and manufacturing and simulation methodology for aircrafts composites. Many successful examples stories such as ex-situ concept have been demonstrated that the performance potential of composites could be enhanced and maximized by basically understandirg the complicated multi-scale and multi-dimensional structural characteristics in relation to properties. Based on the concept, graphite composites system with generally high impact damage resistance and balanced processing conditions has being developed consisting of base resins, modifiers and binders/tackifiers.     

环氧改性双马来酰亚胺树脂聚集态结构的研究

利用透射电子显微镜（ＴＥＭ）追踪环氧改性双马来酰亚胺树脂在固化过程中聚集态结构的变化，发现环氧与双马来酰亚胺形成了互穿网络结构（ＩＰＮ）。但由于环氧和马来酰亚胺的固化活性不同，环氧先发生固化，引起两种单体间的溶解度下降而发生相分离，形成了富环氧区域和富双马来酰亚胺区域。互穿与相分离是两个相反的结构发展方向，它们决定着树脂的结构和机械性能。树脂的互穿程度直接受初始固化温度的控制。     

BMI／ER／DDS三元体系固化反应动力学研究

用差示扫描量热(DSC)研究了BMI／ER／DDS三元固化体系的反应动力学,计算出了表观活化能△E、碰撞因子A和反应级数n,并结合傅里叶变换红外光谱(FTIR)对反应机理进行了探讨,指出了反应过程中生成的叔胺对固化反应的进行有重要促进作用,为进一步研究耐高温复合材料、胶粘剂等奠定了基础。     

Preparation and properties of a novel high‐performance resin system with low injection temperature for resin transfer moulding

A novel high‐performance resin system with low injection temperature for resin transfer moulding, M4506, was developed, which was made of 4,4′‐bismaleimidodiphenylmethane, o,o′‐diallyl bisphenol A, o,o′‐diallyl bisphenol A ether, and 1,1′‐bis(4‐cyanatophenyl)ethane. The processing characteristics, thermal and mechanical properties of the system were studied, and the effect of differing stoichiometries of each component on the processing and performance parameters was discussed. Investigations show that the processing properties of the M4506 system are greatly dependent on the stoichiometries of each component in the formulations, while all the three formulations developed in this paper have good processing characteristics, their suitable injection temperature are between 40 and 50 °C, depending on their respective formulation. The three formulations exhibited outstanding heat resistance (T_g = 294–300 °C) and thermal stability, good toughness and high strength, evidence that the M4506 system is a potential candidate as a high‐performance RTM matrix for advance composites as well as high‐performance paints with no solvents. Copyright © 2004 Society of Chemical Industry     

含硅双马来酰亚胺的合成及表征

采用新的合成路线制得了Ｎ－（４－羟基苯基）马来酰亚胺，并以此为起始反应物合成了３种新型含硅双马来酰亚胺。所合成的含硅双马来酰亚胺的分子结构采用红外光谱及＾１Ｈ－ＮＭＲ进行了表征。     

高性能复合材料基体双马来酰亚胺树脂的研究状况及发展趋势

本文详细介绍了２０多年来国内外双马来酰亚胺树脂的研究状况，并重点分析了增韧技术及其化学原理，最后对双马来酰亚胺的应用和发展趋势作了探讨。     

改性双马来酰亚胺/T300复合材料研究Ⅰ.改性双马来酰亚胺基体树脂的制备

研制了具有良好溶液性质的双马来酰亚胺树脂体系的新方法。该树脂由４，４′－二氨基二苯甲烷双马来酰亚胺，４，４′－二氨基二苯甲烷，改性物Ｂ三元共混物预聚而成。研究结果表明，预聚体在丙酮中具有良好的溶解性，预聚体固化后具有较高的耐热稳定性，可以作为高性能复合材料的候选基体树脂。     

RFI用改性双马树脂膜的黏度特性

采用热塑性树脂改性双马来酰亚胺树脂,获得了适用于RFI成型的改性双马来酰亚胺树脂膜。采用DSC方法和黏度测试研究了该树脂的固化特性和黏度特性,并根据黏度特性建立了Arrhenius模型。结果表明,改性双马来酰亚胺树脂膜的黏度特性能够满足RFI工艺的要求,建立的Arrhenius模型能够较好地预测黏度特性,可为RFI工艺参数的制定提供理论指导。     

新型双马来酰亚胺改性环氧树脂体系性能研究

用含二氮杂萘联苯结构的双马来酰亚胺(DHPZ-BM I)与4,4'-二氨基二苯砜(DDS)为复合固化剂固化环氧树脂(E-51)。采用示差扫描量热仪(DSC)研究了该体系的固化反应动力学,求得固化反应表观活化能Ea=63.28 kJ/mol,碰撞因子A=1.55×106s-1,反应级数n=0.89,该体系与链延长型双马来酰亚胺PPEK-BM I(DP=15)/DDS/E-51体系的固化反应动力学数据几乎相同,证明二者的固化反应过程相同。采用热失重分析仪(TGA)分析研究了上述2种固化体系的热分解动力学,前者的热分解活化能达215.04 kJ/mol,为后者的1.5倍以上,说明DHPZ-BM I/DDS/E-51是1种热稳定性能良好的耐高温环氧树脂体系。