共查询到19条相似文献,搜索用时 109 毫秒
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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。 相似文献
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烯丙基化合物对双马来酰亚胺树脂的改性研究 总被引:3,自引:4,他引:3
为了得到综合性能更好的双马来酰亚胺(BMI)树脂,本文以二烯丙基双酚A(BA)和二烯丙基双酚S(BS)为共改性剂,对BMI树脂进行了改性,考察了共改性剂配比、固化后处理时间对改性BMI树脂体系的影响.采用动态力学分析(DMA)对改性后的BMl树脂浇铸体的热性能进行了初步分析.结果表明,BA/BS(摩尔比)为7/3的浇铸体的玻璃化转变温度(Tg)高达349.5℃,延长固化后处理时间可使浇铸体的Tg大幅提高. 相似文献
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《中国胶粘剂》2013,(10)
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℃。 相似文献
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烯丙基硼酚醛—双马来酰亚胺共聚体系的研究(I) 总被引:2,自引:0,他引:2
本文利用自行合成的烯丙基硼酚醛树脂体系与马来酰亚胺对脂共聚,表征了它们的力学性能,耐热性能和耐水性能,初步探索了胺化合物改性烯丙基硼酚醛与双马来酰亚胺树脂共聚后对耐水性的影响。 相似文献
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综述了双马来酰亚胺树脂增韧改性的几种主要方法,包括橡胶法、热固性树脂法、热塑性树脂法、烯丙基化合物法、有机硅化合物法、纳米粒子法,对其研究方法和增韧机理进行了评述,并对目前双马来酰亚胺树脂的研究现状及发展趋势进行了探讨。 相似文献
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A novel class of allyl compounds based on epoxy resins was synthesized and characterized. The synthesis of these allyl compounds was carried out by reacting corresponding epoxy resin with 2-allyl-4-methylphenol. The copolymers of 4,4′-bismaleimi-dodiphenyl methane with the allyl compounds were prepared and their properties were measured. Results show that modified bis-maleimide resins have excellent processing characteristics such as low softening point, good solubility in acetone, outstanding tack and drape properties, high thermal and hygrothermal stability, as well as improved toughness. Composites based on these copolymers and woven glass cloth also have good properties. 相似文献
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The adhesion between carbon fibers and bismaleimide resins was evaluated using the microbond single fiber pull-out test. A commercially-available, methylene dianiline-based bismaleimide resin and a novel phosphorus-containing bismaleimide were tested with as-received and plasma-treated polyacrylonitrile-based carbon fibers. The surface chemical composition, topography, tensile strength, and surface free energy of the carbon fibers were studied using x-ray photoelectron spectroscopy, scanning electron microscopy, single fiber tensile tests, and dynamic contact angle analysis. The carbon fiber-bismaleimide adhesion improved when the carbon fiber received an oxidative commercial surface treatment or was exposed to an air or ammonia plasma prior to bonding. 相似文献
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The adhesion between carbon fibers and bismaleimide resins was evaluated using the microbond single fiber pull-out test. A commercially-available, methylene dianiline-based bismaleimide resin and a novel phosphorus-containing bismaleimide were tested with as-received and plasma-treated polyacrylonitrile-based carbon fibers. The surface chemical composition, topography, tensile strength, and surface free energy of the carbon fibers were studied using x-ray photoelectron spectroscopy, scanning electron microscopy, single fiber tensile tests, and dynamic contact angle analysis. The carbon fiber-bismaleimide adhesion improved when the carbon fiber received an oxidative commercial surface treatment or was exposed to an air or ammonia plasma prior to bonding. 相似文献
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以烯丙醇和固体KOH为原料制得烯丙醇钾,再在常压下与环氧乙烷反应制得高纯度的烯丙基聚醚,讨论了反应时间、反应温度、原料配比、投料方式等因素对反应的影响。当KOH与烯丙基的摩尔比为1:1.25时,加热回流下可以得到高收率的烯丙醇钾,开环反应依据所需的聚醚分子量调节环氧乙烷的用量,产品收率达到98%以上。 相似文献
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简单分析双马来酰亚胺副反应机理和均相合成工艺的机理与可行性;讨论反应时间、原料配比、极性溶剂用量、催化剂种类等合成条件的影响,并找到最佳反应条件为:反应时间为3 h,MA与MDA的摩尔比为2.2∶1.0,极性溶剂的加入量为10 mL;均相合成工艺缩短了反应时间,提高了产率,降低了成本,减少了副产物的生成,提高了产品质量的稳定性。 相似文献