缠绕用低粘度高韧性环氧树脂体系性能研究

采用脂环族环氧树脂和双酚F环氧树脂为基体树脂,通过添加稀释剂、增韧剂、芳香胺型固化剂,制备了低粘度、高韧性环氧树脂体系,对该树脂体系的耐热性能及复合材料力学性能进行了研究。结果表明,在40℃时树脂体系粘度为230 mpa·s,操作时间大于8h,浇铸体玻璃化转变温度为132.1℃,拉伸强度为70.72MPa,断裂延伸率为3.09%。通过缠绕工艺制备了复合材料单向板,拉伸强度为2839.06MPa,弯曲强度为1609.49 MPa,力学性能优异。     

无机填料对低粘度高性能环氧树脂性能的影响

研究了空心玻璃微珠QH550、石英砂、氧化锌、白炭黑等无机填料对低粘度高活性环氧树脂体系的填充效果,通过比较树脂体系的拉伸性能、弯曲性能和冲击性等力学性能表明,用氧化锌作为填料时,树脂体系各项力学性能达到最优;研究了氧化锌的填充量对树脂体系力学性能的影响,找到了最佳填充量为树脂总质量的60%。     

AG-80/YD-8115环氧树脂体系改性研究

采用甲氧基聚乙二醇、偶联剂和稀释剂分别对AG-80/YD-8115环氧树脂体系进行改性,考察了环氧树脂体系的力学性能和耐热性能。研究结果表明:m(YD-8115)∶m(AG-80)=1.57∶1时,w(甲氧基聚乙二醇)=17%、w(偶联剂)=3%、w(1,4-环己烷二甲醇缩水甘油醚)=2%(相对于固化剂和环氧树脂总质量而言),复合材料的拉伸强度可达14.3 MPa,力学性能、耐热和耐水性能都有大幅提升。     

氨基硅油改性环氧树脂的制备与性能研究

将带有氨丙基的氨基硅油与环氧树脂反应,制备了聚硅氧烷改性的环氧树脂,并对改性产物进行了结构表征。研究了氨基含量以及反应体系中溶剂存在对改性环氧树脂的力学性能的影响,并从微观结构上进行了分析。结果表明:氨基硅油接枝到环氧树脂链上,环氧树脂的力学性能主要依赖于氨基硅油的氨基含量,当摩尔含量5%的氨基硅油与环氧树脂反应,可以较好地提高环氧树脂的力学性能,提高柔韧性,在摩尔含量5%时就能较好提高改性环氧树脂的耐热性能。     

RTM工艺专用混合型树脂体系研究--热性能与力学性能研究

本文对乙烯基酸树脂和环氧树脂共混改性的ＲＴＭ工艺专用脂体系及其复合材料性能进行研究,共混树脂体系ＲＴＭ工艺复合材料的动态机构性能,拉伸及冲击性能研究结果表明,混合型树脂体系的复合材料耐热及力学性能接近或达到环氧树脂体系的性能,成本却比环氧树脂纸１／３以上,采用不同树脂体系的共混改性方法是研究和开发具有良好工艺性、耐热性和力学性能的低成本ＲＴＭ工艺树脂体系的有效途径。     

RTM用BMI/环氧树脂体系的研究

本文在ＢＭＩ中加入二烯丙基双酚Ａ,烯丙基苯酚和低粘度环氧树脂等活性稀释剂,得到了粘度低,贮存期长,反应性较好,可用于ＲＴＭ工艺的树脂体系,其固化物具有优良的力学性能,耐热性能和耐湿热性能。     

环氧化木质素改性环氧树脂的性能研究

将玉米秸秆木质素环氧化后用于环氧树脂的共混改性。借助力学性能测试、扫描电镜观测、红外光谱分析和动态力学分析等方法研究了环氧化木质素在聚乙二醇助溶作用下对环氧树脂/聚酰胺体系力学性能、微观相容性、动态力学性能的影响。结果表明,环氧化木质素与环氧树脂/聚酰胺体系的相容性较佳,能够参与并促进环氧树脂的固化,并可与聚乙二醇协同增韧环氧树脂。随着环氧化木质素添加量的增加,环氧树脂固化物的抗弯强度、抗冲击强度、储能模量和玻璃化转变温度呈现先增加后减小的趋势,当环氧化木质素添加量为8%时,环氧树脂固化物的力学性能和耐热性能提升较大。     

脱水蓖麻油制聚酰胺在环氧树脂体系中的性能研究

采用脱水蓖麻油制聚酰胺,将之应用于环氧树脂固化体系中,并进行了DSC测试、耐热性测试和力学性能测试,综合考察了该聚酰胺与环氧树脂固化体系(DCOPA/EP)的适宜配比。研究结果表明:当DCOPA/EP固化体系以质量比0.8∶1.0混合时,固化反应最完全,固化物的耐热性能最高,冲击、弯曲及剪切性能最强。     

多壁碳纳米管/环氧树脂纳米复合材料的固化动力学研究

采用熔融混合法向低粘度的环氧树脂中添加适量的多壁碳纳米管,制备新型纳米复合材料,并采用傅里叶变换红外光谱仪(FT-IR)测试转化率,采用差示扫描量热法(DSC)研究多壁碳纳米管/环氧树脂复合体系的固化动力学,并对纳米复合材料的力学性能进行研究。结果表明:多壁碳纳米管加入环氧树脂复合体系后,对固化反应有催化作用,固化反应速率增大,转化率提高,而复合体系的力学性能却有所下降,玻璃化转变温度变化不大。     

高性能芳纶绝缘拉杆用树脂配方及性能研究

本文研究了双酚A、双酚F环氧树脂配方体系基础性能,对比分析了两种树脂配方浇注体的力学性能、电气性能和耐热性能,从试验数据得出双酚F配方体系改善了树脂配方耐热性能,却没有降低树脂工艺性能;并使用显微镜和SEM电镜观察绝缘拉杆复合材料结构,并其进行了各种性能测试。     

玉米秸秆木质素改性环氧树脂的制备与性能

将玉米秸秆木质素与双酚A环氧树脂混合,于100℃下预处理1 h,以改善环氧树脂的性能。对预处理后环氧树脂的黏度进行了测试,对改性环氧树脂与聚酰胺固化后材料的力学性能、动态力学性能、热稳定性以及燃烧性能进行了综合测试,考察了不同质量分数的玉米秸秆木质素对改性环氧树脂性能的影响。结果表明:以固化体系的总质量为基准,在w(木质素)=0~7%的范围内,与未添加木质素的环氧树脂相比,随着木质素质量分数的增加,改性环氧树脂22℃下的黏度从1 220 m Pa·s增大到13 220 m Pa·s;改性环氧树脂固化物的弯曲强度随木质素质量分数的增加先升高后降低,在w(木质素)=3%时达到最大值83.2 MPa,但其冲击强度下降,由20.7 MPa降低为13.6 MPa;改性环氧树脂固化物的玻璃化转变温度(Tg)随木质素质量分数的增加而增加,w(木质素)=5%时Tg提高了4.8℃;改性环氧树脂固化物的热稳定性有所改善,w(木质素)=7%时热失重50%的温度提高13℃,同时木质素的加入能够改善环氧树脂的阻燃性能。     

Preparation and characterization of chain‐extended bismaleimide modified polyurethane–epoxy matrices

Intercrosslinked networks of bismaleimide (BMI) modified polyurethane–epoxy systems were prepared from chain‐extended BMI and polyurethane modified epoxy and cured in the presence of 4,4′‐diaminodiphenylmethane. Infrared spectral analysis was used to confirm the grafting of polyurethane onto the epoxy skeleton. The prepared matrices were characterized by mechanical, thermal, and morphological studies. The results, obtained from the mechanical and thermal studies, reveal that the incorporation of polyurethane into epoxy increases the mechanical strength and decreases the glass‐transition temperature and thermal stability. The incorporation of chain‐extended BMI into polyurethane modified epoxy systems increases the thermal stability and both tensile and flexural properties, and decreases the impact strength and glass‐transition temperature. Surface morphologies of polyurethane modified epoxy and chain‐extended BMI modified polyurethane– epoxy systems were studied by scanning electron microscopy. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1562–1568, 2003     

环氧树脂改性水性聚氨酯的制备与性能研究

以异氟尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇(PTMG)以及二羟基甲基丙酸(DMPA)为主要原料合成水性聚氨酯(WPU)预聚体,在此基础上加入环氧树脂(EP,E-44)制备了环氧树脂改性水性聚氨酯(PUE)复合乳液。探讨了不同环氧树脂含量对复合乳液性能的影响,并对胶膜的力学性能、吸水率、接触角和热性能等进行了表征。结果表明,适量的环氧树脂改性过后的复合乳液比较稳定;随着环氧树脂含量的增加,乳液粒径和黏度增大,同时胶膜的拉伸强度增大,水的接触角增大,胶膜的热稳定性增加。E-44质量分数为7%~9%时,复合乳液及其胶膜的综合性能较好。     

一种可用于拉挤成型的改性苯并恶嗪树脂体系

将PM型苯并恶嗪与环氧树脂F-51按照质量比7∶3共混,加入适量的2-乙基-4-甲基咪唑作为固化剂,首次制备了能够适用于拉挤成型的树脂基体。采用凝胶时间测试,示差扫描量热分析,动态热机械分析(DMA)和力学性能测试研究了该树脂体系的粘度特性、固化行为和使用性能。结果表明,该体系150℃下的凝胶时间5 min,60℃粘度471 mPa.s,树脂浇注体的弯曲强度156.7 MPa,弯曲模量4.9 GPa,玻璃化转变温度180℃。该树脂体系具有凝胶快、粘度低以及较好的力学性能和耐热性等特点,能够满足拉挤成型工艺的要求。     

环氧化菜籽油基PVC增塑剂的制备与性能研究

先将菜籽油用苯甲醇醇解,然后再将所得的苯甲醇酯环氧化,制得环氧菜籽油脂肪酸卞酯增塑剂。研究了该增塑剂对聚氯乙烯(PVC)玻璃化转变温度、热稳定性和力学性能的影响。结果表明:每100份PVC树脂加入80份环氧菜籽油脂肪酸卞酯后,PVC树脂的玻璃化转变温度从80℃下降到-28℃,5%热失重温度由240.1℃提升到272.8℃,10%热失重温度由259.9℃提高到288.4℃;分别用环氧菜籽油脂肪酸苄酯和DOP增塑的PVC树脂在常温下显示出相似的力学性能和耐迁移性能。     

碳纤维预浸料用中温固化环氧树脂体系

针对碳纤维预浸料常用环氧树脂体系的一些基本特点,以常温下为固体状态的环氧树脂混合物为基体,采用双氰胺为中温固化剂的固化体系,研究了双氰胺固化剂用量对环氧树脂体系黏度、力学性能、热学性能、溶胀性能的影响,对碳纤维预浸料用环氧树脂体系的研发及应用具有一定参考意义。     

一种高温固化环氧基体树脂的研制

采用预聚合、B阶树脂合成及机械共混工艺制备了一种高温固化环氧基体树脂,探讨了增韧剂-端羧基液体橡胶(CTBN)用量对基体树脂韧性和耐热性的影响.试验结果表明:当CTBN的用量为5phr,且与环氧树脂采用预聚合方式制得的基体树脂获得了较高的耐热性和韧性,玻璃化转变温度为189℃,冲击强度达到了26.12k J/m2;制得...     

Use of eugenol and rosin as feedstocks for biobased epoxy resins and study of curing and performance properties

In this study, an epoxy based on eugenol and an anhydride curing agent based on rosin were prepared. Curing of the eugenol epoxy with a commercial anhydride curing agent and with the rosin‐derived anhydride curing agent was studied. For comparison, a commercial bisphenol A type epoxy, DER353, was also selected in the curing study. The syntheses of the eugenol epoxy and rosin anhydride were investigated and the chemical structures of the products and intermediates were characterized using ¹H NMR and Fourier transform infrared spectroscopies. Non‐isothermal curing of the eugenol epoxy with hexahydrophthalic anhydride and the rosin‐derived maleopimaric acid was studied using differential scanning calorimetry. Thermomechanical properties and thermal stability of the cured epoxy resins were evaluated using dynamic mechanical analysis and thermogravimetric analysis, respectively. Addition of 2‐ethyl‐4‐methylimidazole as catalyst greatly decreased the curing temperature and promoted the completion of cure reactions. The results suggest that the eugenol epoxy and the bisphenol A type epoxy have similar reactivity, dynamic mechanical properties and thermal stability. © 2013 Society of Chemical Industry     

Effects of spherical silica on the properties of an epoxy resin system

The spherical silica powders were prepared by using an oxygen–acetylene flame method. After spheroidization, a scanning electron microscope investigation revealed that the spheroidization efficiency of the powder was nearly 100%, XRD patterns indicated that the raw crystal silica became amorphous silica. In this study, composites of spherical silica and an epoxy resin were prepared with a homogenizer, followed by a stepwise thermal curing process. The thermal stability and thermal degradation behavior of the composites were studied by a thermogravimetric analyzer. Meanwhile, the effects of spherical silica powder on dynamic mechanical, coefficient of thermal expansion, and mechanical properties of epoxy/silica composites were also investigated. The initial decomposition temperature and mechanical properties increased significantly after adding the spherical silica into the composite. The maximum properties of thermal stability and mechanical properties were observed when spherical silica accounted for 30% of the system. The thermal expansion had been significantly reduced by the addition of silica. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

不同固化体系对环氧粉末涂料性能的影响

通过非等温示差扫描量热分析(DSC),热重分析(TGA)及物理力学性能测试研究了分别以双氰胺、二氨基二苯基砜、线形酚醛树脂为固化剂,2-甲基咪唑为固化促进剂的环氧树脂体系的固化行为,热稳定性及其粉末涂料性能,并利用外推法求出不同固化体系的理论固化温度。结果表明:双氰胺/2-甲基咪唑体系的综合性能最好,其理论固化温度为142℃,热失重起始分解温度为410℃,冲击强度为50 cm,60°光泽为83,表面电阻为1.33×1012Ω。