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以4,4′-二苯甲烷双马来酰亚胺、双酚A型氰酸酯和2,2-二烯丙基双酚A为基本原料制备了改性双马来酰亚胺-三嗪(BT)树脂。系统地研究了2,2-二烯丙基双酚A对BT树脂固化动力学、BT树脂的溶解性能和BT树脂固化物的热性能的影响。研究结果表明:烯丙基双酚A有效地降低了BT树脂的固化反应温度并提高了BT树脂的溶解性能。当烯丙基双酚A的加入量为20%(质量分数)时,BT树脂的固化反应峰值降至233.1 ℃ ;并且,其固化物的玻璃化转变温度仍然达到239.4 ℃ ,5%热失重温度为372.9 ℃ ,显示了良好的耐热性能。 相似文献
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采用熔融缩聚法合成了烯丙基苯并恶嗪(Boz-allyl),并利用傅立叶变换红外光谱,磁共振氢谱对其表征。用动态扫描量热与热重分析研究了其固化过程及热性能,随后用其对双马来酰亚胺–三嗪树脂(BT树脂)改性,并分析了改性树脂的力学性能。结果表明,Boz-allyl存在两种固化机理,固化物5%和10%热失重温度分别为325,385℃,在800℃时质量保持率仍可达34%,说明其具有优良的热稳定性和耐烧蚀性,用其改性后BT树脂韧性明显提高,当Boz-allyl质量分数为8%时冲击和弯曲强度达到最大值,分别为11.32 kJ/m2和127.11 MPa。 相似文献
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本文采用间苯二甲酸二烯丙酯(DAIP)和二烯丙基双酚A(DBA)对双马来酰亚胺三嗪树脂(BT)进行改性,制得了一系列改性BT树脂.研究了改性BT树脂的工艺性及其浇铸体的力学性能、热性能和介电性能.结果表明,经DAIP改性后的BT树脂粘度降低,工艺性更佳,浇铸体的拉伸强度和玻璃化转变温度(Tg)均有所提高,介电常数(ε)也稍有减小,且ε有良好的热稳定性;另外,动态热机械分析(DMA)曲线仅显示单个损耗峰,表明DAIP与BT树脂体系有良好的相容性. 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:7,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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Octa(maleimidophenyl)silsesquioxane (OMPS) was synthesized, characterized, and employed to modify the BT resin which composed of 4,4′‐bismaleimidodiphenylmethane (BMI) and 2,2′‐bis(4‐cyanatophenyl)propane (BCE). The curing reaction between OMPS and BT resin was first investigated. It was found that OMPS accelerate the curing reaction of BCE, and the onset temperature of the cyclotrimerization was reduced up to 95.5°C (by DSC). As demonstrated by DSC and FTIR, there was no evidence that indicated the coreaction between maleimide and cyanate ester. 2,2′‐diallyl bisphenol A (DBA) and diglycidyl ether of bisphenol A (E‐51) (Wuxi Resin Factory, Jiangsu Province, China) were also used to enhance the toughness of BT resin, and the formulated BTA (containing DBA) and BTE (containing E‐51) resins were obtained. The thermal properties of BT, BTA, and BTE resins incorporated with OMPS were then investigated. The results of DMA and TG showed that the BT, BTA, and BTE resins containing 1 wt % of OMPS exhibit enhanced thermal properties in comparison with their pristine resins respectively, while more contents of OMPS may impair the thermal properties of the polymer matrix, though the effect of OMPS was slight. Finally, the dielectric constant of these hybrid materials were detected, and their dielectric constant were distinctly reduced by the incorporation of OMPS, while overmuch contents of OMPS were disadvantageous for dielectric constant because of the aggregation of OMPS. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008 相似文献
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E-51环氧树脂改性双酚A型氰酸酯树脂的研究 总被引:3,自引:0,他引:3
采用示差扫描量热法(DSC)、傅里叶变换红外光谱(FTIR)研究了E-51环氧树脂改性双酚A型氰酸酯树脂(BADCy)体系的反应活性、反应机理及固化工艺,通过TGA分析了不同含量E-51环氧树脂改性BADCy后固化物的热性能,并测定了体系的吸水率及力学性能。结果表明,随着E-51环氧树脂用量的增加,BADCy改性体系的反应活性逐渐提高,固化温度逐渐降低;用环氧树脂改性BADCy生成了恶唑烷酮等芳杂环结构,降低了氰酸酯树脂体系的三嗪环交联密度,增加了体系的韧性;改性后材料的起始热分解温度均在380℃以上,吸水率均低于2%。 相似文献
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A series of bismaleimide-triazine (BT) resins with and without O, O′-diallyl bisphenol A (DABPA) were produced by mixing 2, 2-bis (4-cyanatophenyl) propane (BADCy) and MCBMI (2,6-bis(4-(1-(4-(4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)phenoxy)-3-methylphenyl)-3-oxo-1,3-dihydroisobenzofuran-1-yl)-2-methylphenoxy)benzonitrile). The resins show just one glass-transition temperature (T g) and enhanced flexural properties as well as superior fracture toughness compared with commercial BDM/BADCy system, in which BDM is (N,N′-bismaleimido-4,4′-diphenylmethane). Introduction of DABPA can decrease the curing temperature of bismaleimide-triazine (BT) resins but increase its impact strength. When the mole of DABPA reach up to 1.2, the impact strength was increased by 1.34 times in comparison with BDM/ BADCy system. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 136, 47420. 相似文献
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Jing Liu Naidong Ding Renfu Xu Qihui He Jian Shen Baixing Hu 《Polymer Engineering and Science》2011,51(7):1404-1408
Hydroxyl‐terminated polybutadiene (HTPB) rubber was used as a modifier for bisphenol A dicyanate ester (BADCy) to improve its toughness. The effect of catalyst on the curing behavior of the resin and the curing techniques were developed by differential scanning calorimetry. The dynamic mechanical analysis, thermogravimetry analysis, and tensile test were used to study the thermal behavior, mechanical properties, and dynamic mechanical performance of the modified BADCy resins. Results show that addition of HTPB resulted in improved toughness while maintaining relatively good thermal stability. Additional, phase separation phenomenon was confirmed by the analysis of scanning electron microscope. For the toughening of the resin, the main toughening mechanism is shear yielding and crack branching. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers 相似文献
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Bisphenol A dicyanate (BADCy) was modified by diglycidyl ether of bisphenol A epoxy resins with different molecular weights [E20 (weight‐average molecular weight = 1000) and E51 (weight‐average molecular weight = 400)] to investigate the effects of the epoxy molecular weight on the properties of the modified systems. The reactions were monitored with differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy, and the results showed that more pentacyclic oxazolidinone rings were formed in BADCy/E51 than in BADCy/E20 with the same epoxy resin weight content. DSC showed that BADCy/E20 had a lower curing temperature than BADCy/E51 because of the higher concentration of hydroxyl groups (? OH) in E20. Thermal, moisture absorption, and mechanical testing showed that E51‐modified BADCy performed better because of its lower molecular weight. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1744–1750, 2006 相似文献
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Preparation and characterization of soluble bismaleimide‐triazine resins based on asymmetric bismaleimide 下载免费PDF全文
A series of bismaleimide‐triazine resins (EBT) were prepared from 2‐(4′‐maleimido)phenyl‐2‐(4′‐maleimidophenoxyl)phenylbutane (EBA‐BMI) and 2,2‐bis(4‐cyanatophenyl)propane (BADCy). The resins show attractive processability with good solubility in low boiling point solvents and wide processing temperature windows. Introduction of diallylbisphenol A (DBA) can decrease the curing temperature of EBT resins that the curing exothermic peak temperature shifted from 291 to 237 °C as the content of DBA increased from 0 to 20%. The curing condition influenced the thermal properties of the cured EBT resins. The glass transition temperature increased as the curing temperature and curing time increased. The cured EBT resins show high glass transition temperature up to 352 °C, high thermal stability with 5% weight loss temperature over 405 °C, low coefficient of thermal expansion about 45 to 52 ppm/°C, and high storage modulus up to 2.6 GPa at 250 °C. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44519. 相似文献
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以双马来酰亚胺(BMI)、双酚A型氰酸酯(BADCy)和苯并噁嗪(BOZ)树脂为基体树脂,纳米二氧化硅(nano-SiO2)为填料,制备耐高温胶粘剂。采用非等温差示扫描量热(DSC)法、Kissinger法和Ozawa法研究了nano-SiO2/BOZ/BMI/BADCy共聚物的固化动力学过程。结果表明:当m(BOZ)∶m(BMI)∶m(BADCy)=1∶1∶2、w(nano-SiO2)=3%时,相应BOZ/BMI/BADCy胶粘剂的表观活化能(47.82 kJ/mol)低于无nano-SiO2体系(59.17 kJ/mol),并具有良好的耐高温性能;在250℃时用该胶粘剂胶接硅钢片,胶接件经250℃老化1 000 h后,其剪切强度仍保持稳定。 相似文献
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Poly(urea‐formaldehyde) microcapsules filled with epoxy resins(MCEs) were applied to bisphenol A dicyanate ester (BADCy) resin to develop a novel BADCy/MCEs system. The effects of MCEs on the viscosity and the reactivity of BADCy were investigated. The mechanical properties and the hot water resistance of cured BADCy/MCEs systems were evaluated. The morphologies of the cured systems were characterized using a scanning electron microscope. The thermal property of cured systems was investigated using thermogravimetric analysis. The results indicate that MCEs may influence the reaction of BDACy. The proper addition of MCEs can significantly improve the mechanical property and the hot water resistance of cured BADCy resin. MCEs have a negative influence on the initial thermal decomposition temperature (Td) of cured BADCy resin. POLYM. COMPOS., 2010. © 2008 Society of Plastics Engineers. 相似文献
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研究了二烯丙基双酚A(DBA)催化改性酚醛型氰酸酯树脂(cy-5),通过差示扫描量热法(DSC)、热重分析(TG)、冲击性能和动态热机械分析(DMA)测试,分析了改性树脂的热性能和力学性能。研究表明:DBA对cy-5有催化和增韧的双重作用,当DBA的添加量为5%(质量分数)时,催化效果最为明显,含10% DBA的改性树脂固化物的冲击强度达到7.41 kJ/m2,改性树脂固化物的玻璃化转变温度(Tg)和储能模量(E')均有所降低,但幅度不大。 相似文献