RTM用6421BMI树脂性能对时间的依赖性研究

主要研究了树脂传递模塑成型(RTM)用6421双马来酰亚胺(BMI)树脂在室温和低温两种不同储存条件下长期储存后的性能对时间的依赖性.用红外光谱仪检测了6421 BMI树脂体系化学状态对时间的依赖性;用差示扫描量热仪检测了6421 BMI树脂体系反应活性对时间的依赖性;用流变仪检测了6421 BMI树脂体系粘度对时间的依赖性.结果表明,储存条件对RTM用6421 BMI树脂的性能影响不大;该BMI树脂在室温和低温储存6个月后,主体化学状态未发生大的改变,其反应活性降低,但该树脂在注射温度(110℃)下至少仍有6 h的适用期.     

端羟基聚醚砜含量对双马来酰亚胺树脂性能影响研究

研究了端羟基聚醚砜(PES-OH)含量对双马来酰亚胺三元共聚树脂性能的影响.研究结果表明:PES-OH含量变化对固化反应、热稳定性和热机械性能无明显影响,热分解温度均在415℃左右,玻璃化转变温度均在285℃以上;随着PES-OH含量的增加,固化树脂的力学性能均呈现先增加后减小的趋势,且当PES-OH含量为10％时,断...     

RTM用BMI树脂的研究

本文介绍RTM用的双马来酰亚胺(BMI)树脂体系,它主要由BMI、二烯丙基双酚A、苯乙烯和其它助剂所组成。此树脂体系在常温下粘度低,贮存稳定性好,反应性优良,能满足RTM的工艺要求,其固化树脂和复合材料层压板具有良好的力学性能和耐热性。     

耐高温热塑性树脂——聚醚砜中试研究

在10t/a聚醚砜装置上进行多批试验,取得了较稳定的工艺参数。产品质量达到国际同类产品水平,填补了我国的空白,并为工业化生产提供了设计依据。     

成盐剂体系对聚醚砜树脂合成与性能的影响

通过缩聚系统研究了成盐剂体系中的K2CO3:Na2CO3配比及成盐剂过量比和平均粒径等参数对聚醚砜(PESU)树脂合成过程中成盐反应时间、溶液黏度的影响,并利用高压毛细管流变仪和高温注塑方法对合成的PESU热稳定性和颜色等级进行了测试和对比研究.研究发现,成盐剂最优配方为复合成盐剂体系K2CO3:Na2CO3物质的量之...     

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。     

DCPD树脂用于RTM工艺的探讨

本文通过双环戊二烯(DCPD)树脂的合成,就DCPD树脂的性能和RTM工艺的特点进行比较,得出了 DCPD树脂在 RTM工艺中的应用前景。     

RTM用BMI树脂的活性稀释剂研究

采用苯乙烯作为RTM用BMI/DABPA树脂体系的活性稀释剂,对树脂粘度、反应性以及耐热性等方面进行了研究。结果表明,这种活性稀释剂可以极大程度地降低BMI/DABPA树脂的粘度,改善树脂体系的流动性能;由于苯乙烯与BMI/DABPA树脂能发生交联反应,故树脂体系没有低分子挥发物产生,这样在降低树脂体系粘度的同时,兼顾了BMI树脂良好的耐热性能及力学性能。此外,本文还探讨了双马来酰亚胺、二烯丙烯双酚A以及苯乙烯之间的反应机理。实验数据表明,在BMI/DABPA树脂体系中加入25%(W%)的苯乙烯,既可满足RTM用BMI树脂粘度的要求,又可兼顾固化树脂良好的热性能。     

聚醚砜酮树脂基摩擦材料的性能研究

采用固体润滑剂石墨、ＭｏＳ２和含二氮杂萘联苯型聚醚砜酮（ＰＰＥＳＵＫ）研制出ＰＰＥＳＵＫ基减摩复合材料,所得材料的耐磨性能良好,且具有优异的耐热性能,是一类新型无油润滑的耐高温低摩擦材料。     

RTM用基体树脂研究进展

介绍RTM用环氧树脂、不饱和聚酯、聚酰亚胺、酚醛树脂及其他树脂的研究进展.     

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。     

聚醚酰亚胺对共聚双马树脂的增韧作用

采用聚醚酰亚胺(PEI)来提高共聚双马树脂的断裂韧性。实验结果表明,PEI是共聚双马树脂的有效增韧剂;分别加入10份和12.5份的PEI,可使共聚双马树脂的断裂韧性(GIC)分别提高到650J/m2和805J/m2,弯曲模量变化不大,弯曲强度则小幅度下降。用扫描电子显微镜(SEM)和动态力学分析(DMA)研究了改性树脂体系的微观结构,发现其断裂韧性主要与相态结构有关。     

A diallyl bisphenol A ether and diallyl phenyl ether modified bismaleimide resin system for resin transfer molding

A modified bismaleimide (BMI) resin system for resin transfer molding was prepared by using o,o′‐diallyl bisphenol A ether and 1,4‐diallyl phenyl ether as reactive diluents for BMI. The processing behavior was studied through time–temperature–viscosity curves, gel characteristics, and differential scanning calorimetry. The results indicate that the injection temperature can be 80°C, at which its apparent viscosity is only 0.30 Pa · s. Moreover, after it had been maintained at 80°C for 15 h, the apparent viscosity was still less than 1.00 Pa · s. The cured resin had remarkable heat resistance, hot/wet resistance, and mechanical properties. The heat stability and mechanical properties of the composite based on this resin system and woven glass cloth are also discussed. For short beam shear strength, in tests at 150 and 180°C, 90 and 65% of the original room temperature strength was retained. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1649–1653, 1999     

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。     

Polyetherimide‐modified bismaleimide resins. II. Effect of polyetherimide content

A novel polyetherimide was prepared and used to improve the toughness of bismaleimide resin composed of bis(4‐maleimidediphenyl) methane and O,O′‐diallyl bisphenol A. The morphologies of the modified resins change from spherical particles to an inverted phase structure, depending on the modifier's content based on the scanning electronic microscopy results. Dynamic mechanical analysis is also used to characterize morphologies of the modified resins. The phase‐separation process of the modified system is traced by time‐resolved light scattering. The change in the light‐scattering profile with curing time showed that the phase separation mechanism depended on the modifier concentration. Phase separation took place via the spinodal decomposition mechanism in the PEI 15‐phr‐ and 20‐phr‐modified system. The fracture energy (G_IC) increased with PEI content in the modified system; in the PEI 15‐phr‐modified system, the G_IC value was three times greater than that of the unmodified BMI resin. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 350–358, 2001     

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     

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。     

缠绕用无溶剂低温固化双马来酰亚胺树脂体系

在乙烯基苄基化合物改性双马来酰亚胺树脂体系中添加烯丙基苯酚活性稀释剂,得到了粘度小于1000 mPa·s,加工适用期大于8 h,在150～155℃完成固化与后固化、适用于缠绕成型工艺的树脂体系。增韧改性后,该树脂的玻璃化转变温度达到261℃,拉伸强度和弯曲强度分别为73 MPa和133 MPa。     

New bismaleimide resin with improved tack and drape properties for advanced composites

In order to improve the tack and drape properties of prepregs based on bismaleimide (BMI) resins, a new allyl compound containing diglycidyl ether of bisphenol A backbone, designated as AE, was prepared by reacting m-allylphenol (1 mol) with an equimolar amount of diglycidyl ether of bisphenol A (0.5 mol). The copolymer of BMI/AE was prepared and characterized. The softening point of the copolymer is lower than room temperature. The prepregs based on BMI/AE have very good tack and drape properties and a long work life (three weeks) at room temperature. Thermogravimetric analysis (TGA) in nitrogen atmosphere revealed that the cured copolymer was stable up to 515°C. The hot/wet resistance properties of the cured copolymer were investigated by aging it in boiling distilled water. After aging for 100 h, the water absorption and heat defleation temperature (HDT) were 3.6% and 248°C, respectively. In addition, the cured copolymer has good mechanical properties at ambient and elevated temperature. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 273–279, 1997