High‐performance bismaleimide resin film for resin film infusion

A novel high‐performance resin film, coded 4508B, suitable for the resin film infusion (RFI) process, was developed. It was prepared from 4,4′‐bismaleimidodiphenylmethane (BDM), o,o′‐diallylbisphenol A (BA), polyethersulfone (PES), and polyimide (PI). The resin and its composite, reinforced by glass fiber cloth, were prepared and characterized in detail. The results showed that the resin film was stable at room temperature, its infusion temperature was 120°C, and the pot life was more than 60 min. In addition, the cured resin and the composite prepared by the RFI process had good thermal and mechanical properties and hot‐wet resistance. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2918–2922, 2001     

新型双马来酰亚胺改性氰酸酯树脂及其复合材料

采用双马来酰亚胺封端的硫醚酰亚胺低聚物对氰酸酯树脂进行了改性(SBMI),通过红外光谱对改性树脂(SBT)的结构作了表征,通过流变分析,热失重分析研究了其粘度特性及耐热性,并对其玻纤复合材料的力学性能进行了测试。结果表明,当SBMI质量分数为氰酸酯树脂的的37.5%时,SBT树脂的5%热失重温度为415℃,其复合材料在常温下的拉伸强度为438.8 MPa,弯曲强度为657.3 MPa,断裂伸长率为9.2%;200℃时拉伸强度为310.5 MPa,弯曲强度为307.4 MPa,断裂伸长率为12.5%。该树脂具有良好的加工性,耐热性和力学性能。     

热塑性树脂增韧改性双马树脂的研究进展

综述了热塑性树脂增韧改性双马树脂的研究进展。体系增韧效果与相态结构、界面粘合、热塑性粒子的延展性和双马基体的延展性有关。影响相态结构的因素包括热塑性树脂添加量、热塑性树脂分子质量及其与双马树脂的相容性。     

改性双马树脂/碳纤维复合材料体系耐湿热性能研究

对5428/T700复合材料的吸湿率、不同吸湿条件下的玻璃化转变温度及高温湿态力学性能进行了研究。结果表明,5428/T700体系具有较低的吸湿率,经70℃去离子水水煮72 h,吸湿率为0.5%,饱和吸湿率(水煮360 h)为0.8%。而且随着复合材料吸湿量的增加,其Tg下降缓慢;5428/T700复合材料在干态170℃下的弯曲性能和层间剪切性能保持率在70%以上,在湿态150℃下的弯曲性能和层间剪切性能保持率在50%以上;5428/T700复合材料在湿态150℃下的开孔压缩强度保持率在80%以上。     

功能化石墨烯改性双马来酰亚胺复合材料的微观表征及性能

采用改进Hummers法制备氧化石墨烯（GO）,分别采用水合肼、壳聚糖、KOH还原得到了还原氧化石墨烯（rGO）并对三种还原方法做了对比,选择最佳方案;再通过离子液体（NH₂IL）对rGO功能化得到改性还原氧化石墨烯（NH₂IL-rGO）。以二烯丙基双酚A （BBA）和双酚A双烯丙基醚（BBE）为活性稀释剂,4,4'-二氨基二苯甲烷型双马来酰亚胺（MBMI）为反应单体,制备了MBMI-BBA-BBE （MBAE）树脂基体;同时以NH₂IL-rGO为增强体采用原位聚合法制备NH₂IL-rGO/MBAE复合材料。表征了石墨烯和复合材料的微观形貌并分析了石墨烯对复合材料性能的影响。结果表明：NH₂IL-rGO在树脂基体中以两相形式存在,结构完整,并赋予复合材料优异的性能。当NH₂IL-rGO含量为2%（质量）时,复合材料冲击强度和弯曲强度最大,分别为15.33 kJ/m²和142 MPa,热分解温度为435.73℃、当测试频率为100 Hz～10 kHz时介电常数发生突变达到84。     

Synthesis and cure of liquid crystalline diallyl modifiers for bismaleimide resin

Three kinds of liquid crystalline aromatic azomethine modifiers were synthesized with high yield, and the modification of bismaleimide resin (BMI) with them was studied by scanning electron microscope, polarizing optical microscope, thermogravimetric analyzer, differential scanning calorimetry, and rheolometry. Blends cured at the temperature of liquid crystalline phase were found to have oriented liquid crystal‐rich phase and improved mechanical properties. The addition of o,o′‐diallyl bisphenol A in the blends of BMI decreases thermal properties but shows little effect on phase structures. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4366–4371, 2006     

Thermosetting resin system based on novolak and bismaleimide for resin‐transfer molding

A thermosetting resin system for resin‐transfer molding based on novolak and bismaleimide (BMI) was developed. The novolak resin was allylated and BMI was used as the curing agent, and allyl phenyl ether, as the diluent. The viscosity–temperature curve and the viscosity–time curve were used to characterize the processing property of the resin system. The resin system had a long pot life at the injection temperature. Based on the DSC data, a regime for the curing and postcuring cycles was established. The cured resin showed outstanding heat resistance and good flexural properties. Composites based on the resin system and woven glass fabric were fabricated using RTM technology. The composites showed very good flexural properties at room temperature and high retention rates at 200 and 300°C. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1651–1657, 2002     

Properties of bismaleimide resin modified with polyrotaxane as a stress relaxation material

In this study, 4,4′‐diphenylmethane bismaleimide (BMI)/2,2′‐diallylbisphenol A (DABPA) resin was modified with polyrotaxane (PR) as a stress relaxation material. Based on a dynamic mechanical analysis and various properties of the cured resin, the influence of the motion of PR on the cured properties of BMI/DABPA/PR alloy is discussed. The cyclic molecule α‐cyclodextrin (α‐CD) that is threaded onto the PR axis contains a methacryl group in its side chain that reacts with the allyl group of BMI/DABPA resin. The methacryl group of PR reacted with the allyl group of BMI/DABPA matrix resin to form a transparent and dense network structure, so that the glass transition temperature was increased with increasing PR concentration. In addition, the toughness, impact resistance and adhesiveness of BMI/DABPA resin were improved by modification with PR. These results indicate that the poly(ethylene glycol) chain, which is the axial polymer of the PR, moves in the space formed by the cavities of the threaded α‐CD and the surrounding BMI/DABPA resin matrix in the glassy state, thereby relaxing the internal stress applied to BMI/DABPA/PR resin. The range of applications of BMI/DABPA resin modified with PR may expand into fields requiring high heat resistance in addition to excellent toughness and adhesiveness. © 2018 Society of Chemical Industry     

双马来酰亚胺树脂的改性及应用

介绍了双马来酰亚胺(BMI)树脂几种主要增韧改性方法的研究进展,其中包括BMI与烯丙基化合物(APC)共聚,新型BMI单体的合成,BMI与芳胺加成扩链,高性能热塑性(TP)树脂改性,热固性树脂如氰酸脂与BMI的共聚改性,刚性粒子增韧等。还介绍了BMI树脂改性与应用的新方向:辐射固化BMI树脂,泡沫BMI材料,高频印制电路板用基体树脂,电机用绝缘胶和无溶剂浸渍树脂等。     

Cure kinetics of epoxy resin used for advanced composites

The cure kinetics of an epoxy resin used for the preparation of advanced polymeric composite structures was studied by isothermal differential scanning calorimetry (DSC). A series of isothermal DSC runs provided information about the kinetics of cure over a wide temperature range. According to the heat evolution behavior during the curing process, several influencing factors of isothermal curing reactions were evaluated. The results showed that the isothermal kinetic reaction of this epoxy resin followed an autocatalytic kinetic mechanism. In the latter reaction stage, the curing reaction became controlled mainly by diffusion. Cure rate was then modeled using a modified Kamal autocatalytic model that accounts for the shift from a chemically controlled reaction to a diffusion‐controlled reaction. The model parameters were determined by a nonlinear multiple regression method. Copyright © 2004 Society of Chemical Industry     

Preparation and thermal properties of bismaleimide blends based on hydroxyphenyl maleimide

N‐(4‐hydroxyphenyl)maleimide was melt‐blended with the glycidyl ether of bisphenol‐A and various mole percentages of 4, 4′‐(diaminodiphenylsulfone) bismaleimide. The cure behaviour of the resins was evaluated by differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA). The blends showed distinct reductions in the onset of cure (T_o) and peak exothermic (T_exo) temperatures. The blends cured at low temperatures exhibited glass transition temperatures (T_gs) higher than the cure temperatures. The cured blends showed high moduli, glass transition temperatures in excess of 250 °C and good thermal stabilities up to 400 °C. Copyright © 2005 Society of Chemical Industry     

双马改性酚醛树脂的耐热性及热分解动力学研究

采用二笨甲烷型双马来酰亚胺对酚醛树脂进行改性,制备出一种耐热性良好的改性酚醛树脂.采用热重分析法研究了双马来酰亚胺改性酚醛树脂的热分解动力学,并用Kissinger法、Ozawa法、Crane法计算其热分解动力学参数.结果表明,改性树脂的平均表观活化能为376.144kJ/mol,反应级数为0.940,其热分解分为3个...     

反应性聚醚砜对RTM用6421BMI树脂性能的影响

通过SEM及力学性能测试,研究了反应性聚醚砜(rPESU)用量对6421BMI树脂性能的影响,结果表明,rPESU能够显著提高6421树脂的冲击韧性,当rPESU质量分数达到10%时,rPESU在6421树脂中形成连续相,质量分数达到15%时,6421树脂的冲击强度值最高,为纯6421树脂的5倍。rPESU的加入量对6421树脂拉伸模量、压缩模量、弯曲模量的影响很小,但6421树脂的拉伸强度和弯曲强度随rPESU用量增加降低很快,rPESU质量分数达到25%时,拉伸强度和弯曲强度值降为原来的50%左右。     

Bio-based hydroxymethylated eugenol modified bismaleimide resin and its high-temperature composites

Hydroxymethylated eugenol (MEG) and poly (hydroxymethylated eugenol) (PMEG) were synthesized by the condensation reaction of eugenol (EG) with formaldehyde. The different contents of MEG and PMEG were used to modify 4,4′-bismaleimidediphenylmethane (BMI). The cured MEG-BMI resins exhibit good thermal stability evidenced by its 5% weight loss temperatures above 407°C and its residue above 39.4% at 800°C under nitrogen. For carbon/MEG-BMI composites, their glass transition temperatures were around 400°C; their flexural strength and moduli were maintained at a range of 488.87–575.47 MPa and 48.84–60.26 GPa, respectively. With the increasing content of BMI in the resin formulation, the flexural properties decreased; comprehensively the composite with the eugenol/maleimide unit ratio (1:0.3 mol) had the best mechanical and thermal properties, meanwhile its renewable carbon content was as high as 57.80%. As a new candidate of high temperature thermosetting resin, MEG would find promising applications for advanced composites' matrice.     

用烯丙基化合物改性双马来酰亚胺树脂膜的研究

以双马来酰亚胺(BMI)为主要组分,探讨了用二烯丙基双酚A(DP)和环氧丙烯酸酯(VE)对其改性的可能性。实验结果表明,改性后的树脂体系粘度适中,具有良好的成膜性,能够满足树脂膜溶渗(RFI)成型工艺的要求。制成的复合材料性能优异,具有较高的韧性与耐热性。     

双马来酰亚胺树脂反应性和黏度特性的研究

测试了双马来酰亚胺（BMI）树脂体系的反应性和黏度特性,研究了BMI树脂体系的流变性能。通过DSC分析得到体系的起始温度、峰值温度和终止温度分别为202℃、266℃和320℃;根据Arrhenius方程得到体系的反应活化能为E=58．1kJ／mol;经旋转黏度计测试得到该树脂体系的动态黏．温曲线和静态黏-时曲线,在140℃～180℃树脂体系具有一个较宽的低黏度工作平台和优良的工艺性能。其中,140℃下体系黏度小于300mPa·s可保持50min。     

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。     

碳纤维增强树脂基复合材料的应用研究

碳纤维增强树脂基复合材料以其优异的综合性能成为当今世界材料学科研究的重点。本文介绍了的碳纤维增强复合材料的性能，简述了增强机理、成型工艺及其应用领域和发展趋势。     

石墨/铜粉改善双马来酰亚胺复合材料摩擦性能

采用层压成型制备了2类改性双马来酰亚胺纤维复合材料,分别考察了石墨、铜粉的用量对纤维复合材料摩擦性能(摩擦系数,磨损率)和力学性能的影响,并用扫描电镜对复合材料的磨损表面形貌进行了分析。结果表明:石墨对改善双马来酰亚胺的摩擦磨损性能较铜粉更有效。石墨的质量分数为3%时,复合材料的摩擦磨损性能和力学性能达到最佳。     

烯丙基酚醛改性双马来酰亚胺树脂的制备与性能

合成并表征了烯丙基酚醛树脂,再将其与双马来酰亚胺共聚制备了烯丙基酚醛改性双马树脂。通过DSC和FTIR分析了该树脂的固化行为,研究了其工艺性,利用TGA和DMA评价了其固化物的耐热性。结果表明,烯丙基酚醛树脂改性双马树脂可用于RTM等成型工艺,其固化物Tg约为330℃,初始热分解温度约400℃,5%失重温度达410℃,10%失重温度423℃。该树脂耐热性优异,可用作耐高温先进复合材料的基体树脂。