烯丙基酚环氧树脂改性BMI树脂基复合材料

介绍以烯丙基酚环氧树脂改性双马来酰亚胺为树脂基体制得的玻璃布复合材料的性能，并对预浸料及复合材料的性能进行了讨论。     

烯丙基酚氧树脂/双马来酰亚胺改性树脂的制备及表征

用环氧树脂和二烯丙基双酚A(DP)合成了3种新型烯丙基酚氧树脂,测试了该树脂改性双马来酰亚胺(BMI)树脂体系的力学性能和热性能及黏度特性,探讨了后处理对改性树脂性能的影响。结果表明,改性树脂具有良好的2韧性和耐热性,冲击强度达到了22.31kJ/m,HDT仍有224℃,后处理使得体系耐热性大大提高,韧性略有降低。     

新型烯丙基化合物改性双马来酰亚胺树脂的制备及研究

利用环氧树脂和二烯丙基双酚A (DP)合成了一种新型烯丙基化合物(改性剂A),然后用该化合物改性双马来酰亚胺树脂(BMI),通过差示扫描量热法研究了BMI/DP/改性剂A体系的固化反应动力学,确定了固化工艺参数,并测试了该体系的力学性能、热性能和溶解性能。结果表明,该体系固化反应的表观活化能为88.512 kJ/mol,反应级数为0.91,为非整数,表明固化反应机理较为复杂;该体系较佳的固化工艺为150℃/1 h+170℃/2 h+200℃/2 h;相对于DP,改性剂A对BMI的增韧效果更为优异,当改性剂A用量为70份时,BMI/DP/改性剂A体系的力学性能最好,其冲击强度为23.31 kJ/m2,弯曲强度为155.8 MPa,热变形温度为224℃,质量损失5%时的温度为389.4℃,可溶于丙酮,具有良好的韧性、热性能和溶解性能。     

烯丙基化合物改性双马来酰亚胺树脂的研究进展

双马来酰亚胺(BMI)树脂以其优异的机械和热稳定性能广泛用于航空航天等领域,但纯BMI熔点高、韧性和溶解性差,不能满足实际使用要求,必须对其进行改性。探讨了烯丙基化合物改性BMI的反应机理,包括"Ene"反应、Diels-Alder反应以及体系中可能存在的其他反应;并分别概述了二烯丙基双酚A(DABPA)、含硼烯丙基化合物、烯丙基酚醛树脂、烯丙基酚氧树脂及其他烯丙基化合物改性BMI体系的研究进展和改性效果。     

烯丙基化合物改性双马来酰亚胺的研究

综述了近８年来烯丙基化合物改性双马来酰亚胺的研究情况。     

N─烯丙基芳胺改性BMI树脂基复合材料的研制

文中介绍了Ｎ－烯丙基芳胺改性双马来酰亚胺（ＢＭＩ）所得树脂体系的性能，对成型的玻璃布复合材料的力学性能、耐热性和耐湿热性能进行了研究。     

烯丙基线性醛醛树脂改性BMI树脂基复合材料的研究

文中叙述了以烯丙基线性酚醛树脂（ＡＦ）改性ＢＭＩ树脂体制得的玻璃布复合材料的概况，对树脂基体、预浸料及复俣材料性能进行了研究。     

硼酸烯丙基苯酯改性BMI的研究

本文研究了硼酸烯丙苯酯改性双马来酰亚胺树脂体系的物理性能，反应性和固化树脂的力学性能，耐热性，耐烧蚀性以及复合材料的性能等。     

烯丙基酚氧树脂改性双马来酰亚胺树脂基体的研究

以新型烯丙基酚氧树脂作为BMI(双马来酰亚胺)树脂的改性剂,制备相应的改性树脂,并采用红外光谱(FT-IR)法跟踪了该改性树脂的固化反应过程;探讨了活性稀释剂D和后固化工艺等对该改性树脂的黏度、凝胶时间、力学性能和热性能等影响。结果表明:当n(活性稀释剂D):n(BMI)=10:100时,改性树脂的综合性能相对最好,其冲击强度为30.52 kJ/m²、弯曲强度为157.1 MPa和HDT(热变形温度)为224℃;加入适量的活性稀释剂D,可明显降低体系的黏度、提高改性树脂的韧性;后处理工艺可以明显提高改性树脂的耐热性,当后处理工艺为"220℃/2 h→240℃/2 h"时,改性树脂的HDT达到了314℃。     

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。     

烯丙基酚氧树脂改性双马来酰亚胺体系的优化

通过环氧树脂与二烯丙基双酚A合成了一种烯丙基酚氧树脂,用以增韧双马来酰亚胺。在单因素试验的基础上,根据Box-Benhnken的中心组合试验设计原理,选取改性树脂体系组分为影响因子,应用响应面法进行3因素3水平的18组的设计试验,改性树脂性能(弯曲强度,冲击强度,热变形温度)为响应值,对改性树脂组分配比进行优化。结果表明,改性树脂组分配比BMI、DDS、APO、DABPA、DAP为2∶1∶0.2∶0.84∶0.1(物质的量比)时,综合2性能最好,此时改性双马树脂体系的冲击强度可达到21.4 k J/m,弯曲强度为200.5 MPa,热变形温度为195.8℃。     

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。     

Modification of bismaleimide with allyl compound and N‐phenylmaleimide

Three different formulas with low‐cost resins, made up of N,N′‐bismaleimidephenylmethane (BMI), O,O′‐diallybisphenol A(BA), and N‐phenylmaleimide (NPMI) were developed. The properties of prepolymers, such as activation energies, enthalpy, and constants of reaction rate, were obtained by a kinetic programmer on DSC. Thermal and mechanical properties of neat resins were also studied. The results showed that the systems had low melting point and low viscosity. All cured resins presented excellent thermal and good mechanical properties. The mechanical properties could be affected by the quantity of NPMI and postcuring process. The water absorption is ≤1.98%; heat deflection temperature (HDT) is ≥250°C after aging for 100 h in distilled water of 90°C. The data indicate that the BMI can be effectively improved by adding BA and NPMI, while its heat resistance and hot/wet mechanical properties can be fairly retained. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2518–2522, 2001     

Properties of dicumyl peroxide initiated bismaleimide modified allyl novolac and its molded composites

A thermosetting resin system, bismaleimide (BMI) modified allyl novolac (BAN), was developed via reactive blending of formaldehyde and catalyst drop wise to improve the extent of reaction between BMI and phenol‐carbenium ions. For improving the curing behavior and mechanical properties, dicumyl peroxide (DCP) was selected as a novel curing initiator to compare with hexamethylenetetramine (HTMA) which is the most common curing initiator used in the manufacture of phenolic resins. BAN was characterized by ¹H nuclear magnetic resonance and Fourier transfer infrared spectroscopy. Curing behavior with initiators was analyzed by differential scanning calorimetry and glass transition temperature of the cured resins was examined by dynamic mechanical analysis. For evaluating efficiency of the modified system, composite samples using polyvinyl acetyl fiber were molded and tested for flexural properties before and after ageing at 150°C for 1,000 h. The morphology of composite samples was examined by scanning electron microscope, and the effects of the incorporated initiators on the mechanical and thermal properties of composite were investigated. The results indicated that the initiators reduced the curing temperature effectively and improved the curing process. DCP proved to be more effective in crosslinking and heat resistance than HTMA. Meanwhile, the molded composite with DCP showed higher mechanical properties before and after ageing when compared with HTMA curing initiator. Therefore, DCP/BAN resin system with good heat resistance, higher mechanical properties, and better process ability can be applied as matrix resin for the manufacturing of advanced fiber reinforced composites. POLYM. COMPOS., 37:2260–2271, 2016. © 2015 Society of Plastics Engineers     

Preparation and characterization of chain‐extended bismaleimide modified polyurethane–epoxy matrices

Intercrosslinked networks of bismaleimide (BMI) modified polyurethane–epoxy systems were prepared from chain‐extended BMI and polyurethane modified epoxy and cured in the presence of 4,4′‐diaminodiphenylmethane. Infrared spectral analysis was used to confirm the grafting of polyurethane onto the epoxy skeleton. The prepared matrices were characterized by mechanical, thermal, and morphological studies. The results, obtained from the mechanical and thermal studies, reveal that the incorporation of polyurethane into epoxy increases the mechanical strength and decreases the glass‐transition temperature and thermal stability. The incorporation of chain‐extended BMI into polyurethane modified epoxy systems increases the thermal stability and both tensile and flexural properties, and decreases the impact strength and glass‐transition temperature. Surface morphologies of polyurethane modified epoxy and chain‐extended BMI modified polyurethane– epoxy systems were studied by scanning electron microscopy. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1562–1568, 2003