新型低温固化双马来酰亚胺树脂基体研究

双马来酸亚胶树脂基体耐热性好，具有优异的使用性能；但固化温度往往高于２００℃。引发剂可有效地降低固化温度，但所得树脂基体脆性很大。本文在二元胺扩链、烯丙基双酚Ａ共聚后的双马来酰亚胺树脂锄中加入引发剂，制得一种软化点低、韧性适中、耐热性好、贮存稳定的低温固化双马来酰亚胺树脂ＢＤＤＤ体系。为今后该树脂在复合材料构件上的应用奠定了良好的基础。     

双马来酰亚胺树脂及其碳纤维复合材料的电子束辅助固化研究

本文详细探讨了活性稀释剂、辐射剂量对双马树脂电子束固化的影响,分析了双马树脂进行电子束固化的机理,并比较了电子束辅助固化双马树脂碳纤维复合材料的机械性能与相应复合材料热固化的机械性能。     

双马来酰亚胺树脂固化技术及反应机理研究进展

双马来酰亚胺树脂是一种高性能热固性树脂,在尖端技术领域有着广泛的应用。本文综述了双马来酰亚胺树脂(BMI)在热、微波辐射、电子束辐射和紫外光等作用下固化成型技术及固化机理等方面的研究进展。     

适于电子束固化双马来酰亚胺树脂体系的研究

研究了１种适于电子束固化的双马来酰亚胺树脂体系。在４,４’－二苯甲烷双马来酰亚胺和双酚Ａ－二苯醚双马来酰亚胺的低熔点混合物中加入适量的活性稀释剂、催化剂,经３００ｋＧｙ的电子束辐射,所得树脂浇铸体的玻璃化转变温度为２６０℃;室温模量为４．２ＧＰａ。用红外光谱分析法测定了电子束辐射固化之后官能团的转化率。用热重法测定了树脂的热分解温度。     

无溶剂中温固化双马来酰亚胺树脂的合成及性能研究

通过在双马来酰亚胺(BMI)中引入二元胺、环氧树脂(EP)、改性剂苯胺型VB衍生物(N-DVBA)及稀释剂苯基噁唑啉(POX)制成了适合无溶剂型增韧的双马来酰亚胺树脂。通过红外光谱法和差示扫描量热法及动态热机械分析等仪器研究了该改性双马来酰亚胺树脂的结构、反应程度和热稳定性。结果表明,稀释剂及低黏度环氧树脂的引入,对双马来酰亚胺树脂体系的黏度降低很多,浇注体也具有较好的力学性能,能够满足湿法缠绕成型工艺要求。     

改性双马来酰亚胺树脂固化反应动力学参数的计算

本文通过差示扫描量热(DSC)和凝胶化两种方法,分别计算了烯丙基苯基化合物改性双马来酰亚胺(BMI)树脂固化反应动力学参数。前者通过多元线性同归,可求得表观活化能(E)、频率因子(A)和反应级数(n);后者只求得表观活化能,但二者结果一致。结果还表明,随树脂中改性剂含量提高,活化能降低。     

PES改性低温固化双马树脂固化动力学研究

以聚醚砜(PES)作为双马树脂(BMI)的增韧剂,以3,3′-二烯丙基双酚A(DP)作为改性剂,采用非等温DSC(差示扫描量热)法,研究了PES改性低温固化BMI/DP体系的固化反应动力学。结果表明:根据Kissinger方程、Crane方程和n级动力学模型计算出BMI/DP体系的固化动力学方程为dα/dt=2.1×10~(11)(1-α)~(1.07)e×p(-13.89×10~3/T);采用红外光谱(FT-IR)法跟踪固化反应过程,确定了BMI/DP体系的固化工艺为"130℃/3 h→140℃/1h→160℃/2 h→180℃/2 h"。     

改性双马来酰亚胺树脂体系固化反应动力学参数的测定

用PERKIN—ELMER公司的DSC—7仪器测定了改性双马来酰亚胺树脂体系的固化反应。根据DSC测试原理和Arrhenius公式建立的固化反应动力学方程,借助DSC—7动力学软件,求出该树脂体系的固化反应动力学参数—Ea、n、z。利用已得到的动力学参数,进一步预测其固化反应程度(a)、固化反应温度(T)和固化反应时间(t)三者之间的关系。并求出该体系的凝胶化温度(Tgel)、固化温度(Tcure)和后处理温度(Ttreat)的近似数值。     

双马来酰亚胺树脂固化的催化体系及催化机理

综述了目前国内外用于催化双马来酰亚胺树脂(BMI)固化以降低树脂固化温度的方法及机理,包括热引发固化,自由基引发剂、阴离子催化剂及纳米颗粒催化剂引发固化等。     

复合材料缠绕成型用电子束固化环氧树脂体系研究

为了研究适合于缠绕成型的低粘度可电子束固化复合材料的耐热环氧树脂基体,研究了不同组成的电子束固化树脂体系的粘度与温度的关系、耐热性与辐射剂量的关系及浇注体的力学性能。研究表明,树脂EB-4在60℃时粘度为389 mPa.s,树脂辐射固化的最佳剂量为150 kGy,而且在150 kGy辐射固化的EB-1、EB-4的玻璃化转变温度Tg分别为212.96℃、214.77℃,EB-4树脂浇注体的拉伸强度可以达到52.7 MPa,拉伸弹性模量2.79 GPa,断裂延伸率为2.18%,是1种适用于室温或低温下缠绕成型的耐热电子束固化环氧树脂基复合材料树脂体系。     

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     

双马来酰亚胺树脂改性研究

综述了采用物理法和化学法改性双马来酰亚胺树脂(BMI)的研究进展,物理法使用的材料涉及:碳纳米管,三维编织碳纤维和凯夫拉纤维混合物,空心玻璃微球,氧化铜,硅灰石,无机纳米粒子和晶须。化学法包括:二元胺改性,烯丙基化合物改性,有机硅改性,热塑性树脂改性等。     

玻璃钢缠绕成型工艺的计算机辅助分析、设计和控制

本文综合分析了计算机辅助分析、辅助设计和控制在纤维缠绕成型工艺中的广泛应用，分析了系统的组成、结构、功能以及设计方法，并开了计算机软件和控制系统     

Carbon nanotube composites fabricated through filament winding process for battery preheating application

Carbon nanotube (CNT) polymer composites have broad application prospects in thermal management as electrothermal heaters. Nevertheless, challenge remains in achieving high electrical conductivity for the composites due to the contradiction between CNTs and insulated polymers. To address this issue, herein, innovative use of interface strategy approach by constructing synergistic nanomaterial networks on carboxyl CNTs yarn winding composites for improving the interfacial adhesion and electrical performance. In the work, carboxyl CNTs yarn/CNTs-graphene oxide (GO) polyvinyl alcohol (PVA) composites (C-CY-HP-C) were proposed and manufactured via filament winding process. The as-constructed C-CY-HP-C demonstrated a remarkable interfacial shear strength of 2057.16 N mm⁻¹, which was 53.59% higher than that of control CNTs yarn/PVA winding composites. In addition, the C-CY-HP-C achieved an attractive electrical conductivity of 346.39 S cm⁻¹ owing to the electronic transmission channels were formed. Notably, the superior electrical conductivity facilitated a rapid-response of electrothermal performance for the C-CY-HP-C. It reached a steady-state temperature of 229.9°C within 10 s when the voltage was 1.2 V. Concurrently, it exhibited an impressive heating rate of 10.8°C min⁻¹ at an ambient temperature of −20°C as the battery surface heater. These findings shed light on the development of technique for battery preheating system based on CNTs yarn/polymer composites.     

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。     

High‐performance bismaleimide resin film for resin film infusion

A novel high‐performance resin film, coded 4508B, suitable for the resin film infusion (RFI) process, was developed. It was prepared from 4,4′‐bismaleimidodiphenylmethane (BDM), o,o′‐diallylbisphenol A (BA), polyethersulfone (PES), and polyimide (PI). The resin and its composite, reinforced by glass fiber cloth, were prepared and characterized in detail. The results showed that the resin film was stable at room temperature, its infusion temperature was 120°C, and the pot life was more than 60 min. In addition, the cured resin and the composite prepared by the RFI process had good thermal and mechanical properties and hot‐wet resistance. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2918–2922, 2001     

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。     

反应性聚醚砜对RTM用6421BMI树脂性能的影响

通过SEM及力学性能测试,研究了反应性聚醚砜(rPESU)用量对6421BMI树脂性能的影响,结果表明,rPESU能够显著提高6421树脂的冲击韧性,当rPESU质量分数达到10%时,rPESU在6421树脂中形成连续相,质量分数达到15%时,6421树脂的冲击强度值最高,为纯6421树脂的5倍。rPESU的加入量对6421树脂拉伸模量、压缩模量、弯曲模量的影响很小,但6421树脂的拉伸强度和弯曲强度随rPESU用量增加降低很快,rPESU质量分数达到25%时,拉伸强度和弯曲强度值降为原来的50%左右。     

聚醚酰亚胺对共聚双马来酰亚胺树脂的增韧作用

采用二烯丙基双酚A、烯丙基酚醛改性4,4'-二氨基二苯甲烷双马来酰亚胺共聚制备了一类新型的双马来酰亚胺树脂(简称ABD)。以ABD为基体,选用热塑性树脂聚醚酰亚胺(PEI)为增韧剂,采用共混法制备了共聚双马来酰亚胺/聚醚酰亚胺(PEI)树脂体系。采用DSC和流变仪对ABD树脂的固化行为进行了研究,结果表明,该树脂粘度较低,室温下为液态,树脂的冲击强度为8.99 kJ/m2。通过DMA、TGA和扫描电镜对PEI加入量对树脂热性能和微观形貌的影响表明,添加质量分数为15%聚醚酰亚胺时,树脂冲击强度达到16.9 kJ/m2,比基体树脂提高了88%。