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无机填料对低粘度高性能环氧树脂性能的影响 总被引:2,自引:0,他引:2
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%。 相似文献
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RTM工艺专用混合型树脂体系研究--热性能与力学性能研究 总被引:1,自引:0,他引:1
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。 相似文献
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RTM用BMI/环氧树脂体系的研究 总被引:2,自引:0,他引:2
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。 相似文献
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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。 相似文献
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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。 相似文献
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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 相似文献
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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。 相似文献
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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。 相似文献
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环氧化菜籽油基PVC增塑剂的制备与性能研究 总被引:1,自引:0,他引:1
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。 相似文献
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Jianglei Qin Hongzhi Liu Pei Zhang Michael Wolcott Jinwen Zhang 《Polymer International》2014,63(4):760-765
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 相似文献
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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 相似文献