二烯丙基双酚A改性双马来酰亚胺三嗪树脂的固化工艺及性能

以烯丙基化合物改性的方法制得了改性双马来酰亚胺三嗪(BT)树脂,研究了改性BT树脂体系的固化动力学,求得表观活化能为45.9 kJ/mol,反应级数为0.842,确定了固化工艺,并采用力学性能分析和动态热机械分析等手段对树脂浇铸体的性能进行了研究.结果表明,对于烯丙基化合物改性BT树脂体系,二烯丙基双酚A具有改善双马来...     

二烯丙基双酚A改性双马来酰亚胺高温胶粘剂

本文介绍了一种以二烯丙基双酚A(BA)改性2,6-二氨蒽醌双马(EBMI)、4,4-二氨基二苯醚基二苯砜双马(BBMI)的耐高温胶粘剂.该胶粘剂长期使用温度为250℃,短期使用温度为400℃,具有优异的耐温性.     

DAIP改性双马来酰亚胺三嗪树脂的性能研究

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.     

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

介绍了烯丙基化合物改性双马来酰亚胺树脂(BMI)的反应机理,综述了二烯丙基双酚A、含硼烯丙基化合物、烯丙基醚、烯丙基酚氧树脂等改性BMI体系的研究进展。     

双马来酰亚胺/二烯丙基双酚A共聚树脂及其玻璃布层压板的制备和性能

用溶液法合成了双马来酰亚胺(BMI)/二烯丙基双酚A(DABPA)共聚树脂。用FTIR、~1H-NMR等方法表征了树脂的结构。DSC曲线显示该树脂的固化能与熔融法得到的基体树脂有所不同。该树脂固化后有良好的热稳定性。以该树脂为基体制备了玻璃布层压板,测试结果表明层压板具有较好的力学性能和电气性能可以作为耐高温结构材料或电绝缘材料在180～200℃长期使用。     

双酚A二烯丙基醚/双马来酰亚胺树脂固化动力学研究

以BBE(双酚A二烯丙基醚)作为BDM(4,4′-二氨基二苯甲烷双马来酰亚胺)树脂的改性剂,采用旋转黏度计和非等温DSC(差示扫描量热)法分别研究了BBE/BDM树脂体系在不同温度时的黏度和固化反应动力学过程。研究结果表明:该树脂体系在90~215℃范围内具有较低的黏度(低于1 000 mPa·s),完全满足RTM(树脂传递模塑)的工艺要求;该树脂体系的凝胶温度为210.7℃、固化温度为254.7℃和后处理温度为287.7℃,其固化体系的表观活化能为209.79 kJ/mol、频率因子为3.23×1018s-1和反应级数为0.955(近似1级反应)。     

烯丙基化合物对双马来酰亚胺树脂的改性研究

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.     

一种改性双马来酰亚胺共聚树脂体系及其粘接性能的研究

以二苯甲烷双马来酰亚胺和二烯丙基双酚A为共聚单体，在适当的催化剂等作用下，制备了一种改性双马来酰亚胺共聚树脂。本文对这种改性的双马来酰亚胺共聚树脂的溶解性能、固化反应动力学和固化机理进行了讨论；对体系固化物的机电热性能及其胶粘剂的高低温粘接性能也进行了研究。     

双马来酰亚胺树脂的共聚改性

介绍一种由双马来酰亚胺、取代双马来酰亚胺和二烯丙基双酚A共聚所得树脂体系,重点研究了树脂的性能如溶解性、粘度特性、凝胶时间和反应性等以及固化树脂的力学性能和耐热性等。     

聚乙二醇改性双马来酰亚胺-三嗪树脂/玻璃纤维布复合材料的热性能

聚乙二醇对树脂基玻璃纤维布复合材料增韧具有优良的效果,但其柔性链段的分子结构本质极大影响了复合材料的耐热性能。本文以聚乙二醇为改性剂制备了聚乙二醇/BT树脂/玻璃纤维布复合材料,系统研究了不同分子链长度以及不同含量的聚乙二醇对复合材料热性能的影响。研究结果表明：聚乙二醇的加入降低了复合材料的玻璃化转变温度、5%热失重温度以及800 ℃残炭率。在聚乙二醇相对分子质量为4000时,复合材料的热性能出现最大值。随聚乙二醇含量的增加,复合材料的热稳定性能逐步下降。由于聚乙二醇、BT树脂、玻璃纤维布之间较大的界面结合力,使基体树脂的链运动受到一定程度的限制,一定程度上缓解了由于聚乙二醇的加入而使复合材料的热稳定性能下降的趋势。研究结果为合理添加聚乙二醇而提高复合材料的韧性提供了热性能方面的参考依据。     

Thermal properties of new bismaleimide resins containing hydrogen silsesquioxane and diallyl bisphenol A

Bismaleimide (BMI) resins modified with hydrogen silsesquioxane (HSQ) and diallyl bisphenol A (DABPA) (BMI‐HSQ‐DABPA resins) were prepared. DSC, FTIR, and TGA were used to characterize the curing behaviors, structures, and thermal properties of the BMI‐HSQ‐DABPA resins, respectively. The results showed that the glass transition temperatures and thermal stabilities of the cured BMI‐HSQ‐DABPA resins increased with the rise of the contents of HSQ. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Thermal stabilization effect of biphenol monoacrylate on polyamide 6

Biphenol monoacrylate (AL) was combined with a traditional hindered phenolic‐based binary antioxidant system to form a ternary stabilization system for the purpose of further improving the thermal–oxidative stability of polyamide 6 (PA6). The thermal stabilization effect of the antioxidant AL on PA6 was studied in terms of the reduced viscosity, the chemical structure, the yellow index, and the mechanical properties. The results showed that the antioxidant AL, with the proper chemical structure, could improve the thermal stability of PA6 effectively through a unique bifunctional stabilizing mechanism. The interaction of the molecules of PA6 with the antioxidant AL was investigated. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

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     

Bismaleimide resin modified with diallyl bisphenol A and diallyl p‐phenyl diamine for resin transfer molding

O,O′‐diallyl bisphenol A (DBA) and N,N′‐diallyl p‐phenyl diamine (DPD) were used for the reactive diluents of 4,4′‐bismaleimidodiphenol methane (BDM). The objective was to obtain a modified BDM resin system suitable for resin transfer molding (RTM) process to prepare the advanced composites. The processing behavior was determined by time–temperature–viscosity curves, gel characteristics, and differential scanning calorimetry (DSC). The injection temperature of the resin system in RTM could be 80°C, at which its apparent viscosity was only 0.31 Pa/s, and the apparent viscosity was still less than 1.00 Pa/s after the resin was held at 80°C for 16 h. The gel time test result indicated that at low temperatures, the reactivity of the resin system is low, whereas at high temperatures, the resin could cure very fast, which was beneficial to RTM. The postcure of the cured resin at a given temperature was necessary because the resin had a wide and flat cure exothermic peak, observed by DSC curve. The cured resin displayed both high heat and hot/wet resistance and high mechanical properties, especially tensile strength, tensile modulus, and flexural strength at room temperature, which reached 96.2 MPa, 4.8 GPa, and 121.4 MPa, respectively. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2245–2250, 2001     

二烯丙基双酚A催化改性酚醛型氰酸酯树脂的催化固化

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。     

Synthesis of functionalized GO for improving the dielectric properties of bismaleimide-triazine resin

A type of functionalized graphene oxide (GO), named GO-POSS-BPA, was synthesized by nucleophilic substitution reaction with chloropropyl polyhedral oligomeric silsesquioxanes (POSS) and bisphenol A (BPA). Subsequently, the GO-POSS-BPA was added into bismaleimide-triazine (BT) resin to improve dielectric properties of bismaleimide-triazine resin. The structure of GO-POSS-BPA was characterized by Fourier-transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and transmission electron microscopic (TEM). The effects of GO-POSS-BPA on the dielectric, mechanical, thermal and water resistant properties of BT resin were investigated systematically. The results show that, GO-POSS-BPA decreased the dielectric constant and dielectric loss of BT resin over the testing frequency from 10 to 50 MHz, also enhanced the stability of dielectric constant. Meanwhile, the appropriate content of GO-POSS-BPA can enhance the impact and flexural strengths of BT resin to a certain extent. In addition, GO-POSS-BPA can also enhance the thermal stability and moisture resistance of BT resin.     

新戊二醇共聚改性PET热性能研究

以对苯二甲酸、乙二醇为主要原料,添加第三单体新戊二醇合成了一系列不同NPG含量的共聚酯(PENT),利用差示扫描热(DSC)研究了NPG对PET性能的影响。结果表明,随着NPG含量的增加,共聚酯的玻璃化转变温度(Tg)、熔点(Tm)和熔融结晶温度(Tmc)降低,冷结晶温度(Tc)升高,结晶能力逐渐减弱。     

Thermal properties of PET modified by neopentyl glycol

以对苯二甲酸、乙二醇为主要原料,添加第三单体新戊二醇合成了一系列不同NPG含量的共聚酯（PENT）,利用差示扫描热（DSC）研究了NPG对PET性能的影响。结果表明,随着NPG含量的增加,共聚酯的玻璃化转变温度（Tg）、熔点（Tm）和熔融结晶温度（Tmc）降低,冷结晶温度（Tc）升高,结晶能力逐渐减弱。     

纳米凹凸棒土改性聚氨酯纤维的热性能研究

用不同含量的纳米凹凸棒土(AT)改性聚氨酯(PU)纤维,研究了改性PU纤维热分解动力学,测定了分解活化能,讨论了AT对改性PU纤维热性能的影响。结果表明:AT的加入,提高了PU纤维的起始分解温度,改善了纤维的热稳定性;加入质量分数为1.5%的AT,改性PU纤维的起始分解温度相比纯PU纤维提高了近14℃,增强了PU硬段的热分解稳定性。