端氨基丁腈橡胶与纳米SiO_2粒子增韧环氧树脂性能

采用端氨基液体丁腈橡胶(ATBN)、纳米SiO_2粒子对环氧树脂体系进行增韧,研究了两种增韧剂的加入对树脂体系凝胶时间的影响。结果表明,随着ATBN用量的增加,体系的凝胶时间在同等温度下都明显减小;制备了不同增韧剂添加量的树脂浇注体并对其力学性能进行测试,结果表明,当ATBN的添加量为10份,纳米SiO_2粒子添加量为1.5份时,增韧效果最为明显,与未增韧体系相比,浇注体冲击强度、弯曲强度、拉伸剪切强度分别提高68%,18%,90%;应用差示扫描量热仪进行固化反应活性以及固化产物动力学研究,确定了当ATBN、纳米SiO_2粒子的添加量分别为10份、1.5份时,树脂体系进行固化反应的表观活化能为63.99 kJ/mol,反应级数为0.90;应用增韧后树脂体系制备了复合材料并对其力学性能进行了测试,结果表明增韧后复合材料弯曲强度达到681.82 MPa,比未增韧树脂体系制备的复合材料提高了28%。     

EPN纳米橡胶粒子增韧双氰胺环氧树脂及其复合材料性能研究

采用EPN核壳纳米橡胶粒子对双氰胺固化环氧树脂进行增韧改性。通过傅里叶变换红外光谱(FT-IR)法和扫描电子显微镜(SEM)法表征了EPN的化学结构和表面形貌;使用扫描透射电镜(TEM)表征了EPN粒子在环氧树脂中的分散状态;通过黏度、差示扫描量热分析(DSC)法以及动态热机械分析仪(DMA)表征了EPN粒子对体系流变性能、反应活性以及耐热性的影响;通过树脂浇铸体的冲击强度、复合材料的I型层间断裂韧性(G_IC)与冲击后压缩强度(CAI)研究了EPN粒子对树脂及其复合材料韧性的影响。研究结果表明：EPN粒子表面含有大量活性官能团,与环氧树脂间具有良好的相容性,能够以纳米尺寸分散在环氧树脂中;EPN粒子表面的活性官能团能够与环氧树脂反应,添加EPN粒子体系的黏度能够满足材料工艺需求。EPN粒子对环氧树脂具有良好的增韧效果,6%左右的添加量即可使树脂基体的冲击强度达到51 kJ/m2以上,较增韧前提高了130%,同时对体系的Tg无明显影响。复合材料韧性研究结果表明,添加EPN质量分数为6%的复合材料的GIC和CAI均提高了60%以上,具有显著的增韧效果。     

ACTECH?1203树脂体系固化动力学及其复合材料真空成型工艺研究

采用非等温差示扫描量热法(DSC)对一种通用航空低成本复合材料用环氧树脂体系(ACTECH?1203)进行了固化动力学研究.基于不同升温速率下的测试结果,建立了ACTECH?1203树脂体系的n级动力学模型,并对反应活化能(Eα)进行验证.结合树脂的流变性能和固化过程中的介电黏度变化确定了通用航空低成本预浸料复合材料真空袋成型最佳固化工艺参数.结果表明:设定的固化参数成型的复合材料其孔隙率小于1％,力学性能优异.     

一种OOA成型中温固化环氧树脂芳纶纤维预浸料研究

研制一种OOA(非热压罐)成型中温固化环氧树脂芳纶纤维预浸料,对树脂进行流变性能和DSC分析,确定树脂的固化工艺。采用热熔法制备OOA成型芳纶纤维预浸料,通过真空袋法成型复合材料层压板,进行性能测试。结果表明,OOA成型中温固化环氧树脂芳纶纤维预浸料适合真空袋法成型复合材料,层压板孔隙率低,力学性能满足要求,复合材料玻璃化转变温度高,具有较好的耐热性。     

碳纤维及偶联剂用量对环氧树脂性能的影响

采用浇注成型工艺制备了碳纤维增强热固性树脂基复合材料;研究了常用的不同偶联剂(硅烷偶联剂及钛酸酯偶联剂)对环氧树脂增强增韧作用的差别;集中考察了偶联剂用量、碳纤维用量对环氧树脂力学性能的影响。研究结果表明,硅烷偶联剂的效果好于钛酸酯偶联剂;碳纤维可明显改善体系的力学性能,各强度随纤维含量的增加而增大,当纤维含量超过一定量时,力学性能开始下降,在纤维添加量为基体树脂的5 wt%左右时,所得体系的综合性能较好。     

膨胀阻燃环氧树脂/有机化凹凸棒土复合材料的制备及性能研究

考察了不同膨胀型阻燃剂(IFR)添加量对环氧树脂(EP)阻燃性能的影响,以及有机化凹凸棒土(OAT)对膨胀阻燃环氧树脂复合材料性能的影响,最后对复合材料的增韧机理及阻燃机理进行了简要分析。结果表明,在环氧树脂中加入25%的IFR,可使复合材料的氧指数(LOI)达到30%,并通过UL94 V-0级测试,但拉伸性能有所降低;在膨胀阻燃环氧树脂体系中,适量添加3%的OAT能使复合材料的力学性能有所提高,对氧指数未见协同改善效果,但都通过了UL94垂直燃烧测试。     

二茂铁对DOPO/环氧树脂体系燃烧性能及固化反应动力学的影响

为研究二茂铁对磷杂菲(DOPO)/环氧树脂(EP)体系燃烧性能及固化反应动力学的影响,将不同比例的二茂铁与DOPO/EP体系复配制备了阻燃EP复合材料,通过氧指数(LOI)测试、UL94垂直燃烧测试、烟密度测试和热重分析研究了阻燃EP复合材料的燃烧性能和热氧稳定性,并通过非等温DSC法研究了二茂铁对DOPO/EP体系固化反应动力学的影响。结果表明,二茂铁和DOPO在阻燃EP复合材料中表现出明显的阻燃协效作用,添加了二茂铁的阻燃EP复合材料的LOI最高可达34.8%,烟密度等级(SDR)最低降至71.43。热重分析表明,二茂铁会降低阻燃EP复合材料的热氧稳定性,但是可以显著增加热解残炭量。固化反应动力学研究结果表明,二茂铁的添加使阻燃EP体系固化反应的活化能E_a和指前因子A均减小。研究工作可以为高性能阻燃EP复合材料的开发提供参考。     

真空辅助树脂灌注配套基体树脂的制备及性能

针对真空辅助成型技术(VARI)对基体树脂的特殊要求,结合航空材料对性能的高要求,研制了BA9912中温固化环氧树脂体系。采用VARI工艺制备了G0827/BA9912复合材料,测试了BA9912树脂浇注料及其复合材料的力学性能和耐热性能,并与国内外同类树脂进行了适当的比较分析。分析测试结果表明,BA9912树脂具有良好的力学性能、耐热性能和工艺性能,能够满足VARI成型工艺要求,适合在航空航天领域中应用。     

CE/EP/纳米SiC复合材料研究

采用纳米SiC和环氧树脂(EP)对双酚A型氰酸酯树脂(CE)进行改性。研究了不同含量的纳米SiC对CE/EP/纳米SiC复合体系反应性及CE/EP/纳米SiC复合材料力学性能的影响,采用透射电子显微镜表征了材料的微观形貌,利用差示扫描量热法研究了固化树脂的热性能。结果表明,纳米SiC对CE/EP/纳米SiC复合体系具有明显的催化作用,并且能使复合材料的冲击强度提高123.62%,弯曲强度提高140.29%,有效发挥其增强增韧作用,还能很好地保持复合材料的耐热性能。     

耐高温树脂的固化动力学分析及其力学性能

本文对一种耐高温环氧树脂体系进行了固化动力学研究,计算出该树脂体系的活化能为70.62kJ/mol、反应级数为0.93,并得到该体系的反应速率常数方程和动力学方程式,确定了树脂体系的固化工艺。还制备了T700碳纤维单向板,并对其力学性能进行测试。结果表明,该树脂体系具有优良的耐热性（树脂固化物的Tg达到218℃）、反应活性高,适用于快速成型固化工艺,其复合材料具有良好的力学性能。     

SCRIMP用环氧树脂体系及其复合材料的性能研究

采用粘度、凝胶时间及力学性能测试以及示差扫描量热分析和扫描电镜研究了上纬环氧树脂2511-A体系的工艺性能,固化反应行为及其采用西曼树脂浸渍膜塑成型工艺(Seeman Composites Infusion Molding Process,SCRIMP)制成的环氧玻璃纤维复合材料的性能。结果表明:2511-A体系在25～35℃下粘度保持在600 mPa.s以下的时间长达120 min,满足SRCIMP成型工艺要求,其玻璃化转变温度为112℃。复合材料的孔隙率仅为0.19%,且具有良好的力学性能。     

电抗器用玻纤纱/环氧树脂复合材料最优含胶量的研究

玻璃纤维纱增强环氧树脂是玻璃钢的一种,由于其良好的电气绝缘性能及机械性能,所以在干式空心电抗器包封绝缘层中被广泛使用。主要研究了玻纤/环氧树脂复合材料中玻璃纤维纱与环氧树脂的最佳比例,因环氧树脂固化物本身具有良好的电气绝缘性,故只针对其力学性能进行测试和评估,最终确定出二者的最优比例,同时确立一个行业的标准。     

Vacuum‐assisted resin transfer molding using tackified fiber preforms

A low cost composite fabrication process—tackified SCRIMP—is described for fabricating aerospace‐grade composites based on tackification and vacuum‐assisted resin transfer molding (VARTM). Tackification based on a commercial tackifier (FT 500 from 3M) was used to make the net‐shape fiber preform. It was found that tackifier concentration and application conditions play important roles in governing the moldability of tackified fiber preforms. An epoxy resin (PR 500 from 3M) was used in the VARTM process‐SCRIMP at high temperatures. Experimental results show that composites with high fiber content (> 60% by volume) can be manufactured at low cost using tackification. Effects of tackification methods on composite dimension control, void content and mechanical properties were investigated and compared in both RTM and SCRIMP.     

Resin transfer molding (RTM) with toughened cyanate ester resin systems

This investigation explored the feasibility of recently developed toughened cyanate ester networks as candidate materials for high performance composite matrix applications. The resin investigated was a bisphenol-A cyanate ester toughened with hydroxy functionalized phenolphthalein based amorphous poly(arylene ether sulfone). A series of four toughened cyanate ester resins were generated by varying the concentration and the molecular weight of the toughener. The thermoplastic modified toughened networks exhibited improvement in the fracture toughness over the base cyanate ester networks without significant reductions in mechanical properties or glass transition temperature. Carbon fabric composite panels were manufactured by liquid molding processes (resin transfer molding and resin film infusion) with the untoughened and toughened cyanate ester resin systems. The panels were subjected to physical, impact damage, and fracture toughness tests. The results of physical testing indicate consistently uniform quality, and the maximum void content was found to be less than 2%. The toughened cyanate ester composites exhibited significantly improved impact damage resistance and tolerance compared with hot-melt epoxy systems. A marked increase in the mode II composite fracture toughness was observed with an increase in the concentration and the molecular weight of the toughener.     

Cure monitoring of the liquid composite molding process using fiber optic sensors

Fluorescence has been demonstrated to be an accurate tool for monitoring resin cure. It is measured using an evanescent wave fiber-optic sensor. An economical optical fiber sensor has been developed with a refractive index greater than 1.6, permitting evanescent wave monitoring of epoxy resins. The fluorescence wave-length-shift, which has been correlated with monomer conversion, is monitored during the liquid molding process. Unidirectional glass fabrics with volume fractions from 40% to 60% were injected with epoxy resin at a variety of driving pressures and cured at several temperatures. Several composite parts were fabricated to test the effects of vacuum pressure, injection rate, cure temperature, and fiber fraction on the performance of the sensor. The sensitivity of the evanescent wave fluorescence sensor to the condition of the resin system was also examined. The sets of resin/hardener samples were subjected to rigorous chemical analysis to determine the extent of their differences.     

聚砜改性环氧树脂复合材料热老化性能研究

以聚砜(PSF)改性环氧树脂(EP)为基体树脂,玻璃纤维为增强材料,采用高温模压成型法制备出PSF改性EP/玻璃纤维复合材料。结果表明:PSF能有效提高EP基体的热稳定性能;经200℃热老化72 h后,PSF改性EP/玻璃纤维复合材料的热失重率<1%,其冲击强度和弯曲强度呈先升后降态势,电绝缘性能仍然较好(其体积电阻率和表面电阻率的数量级仍保持在1012左右);该复合材料在高温绝缘场合中具有良好的应用前景。     

碳纤维复合材料发动机壳体用高性能树脂基体的研制

在综合考虑树脂黏度、力学性能、耐热性能的基础上。开发了适用于碳纤维复合材料火箭发动机壳体温法缠绕成型工艺用耐高温和韧性环氧树脂基体。用差示扫描式量热法(DSC)、傅里叶红外光谱FT—IR等分析技术对该韧性树脂基体的固化反应动力学参数、树脂基体固化物的性能和复合材料的性能进行了系统的研究。结果表明，该韧性树脂基体黏度低，适用期长，韧性好，与碳纤维界面粘接强度高，所制得的复合材料火箭发动机壳体纤维强度转化率高。为今后相关方面的研究指明了方向。     

玻纤增强ABS复合材料的制备及性能

以丙烯腈-丁二烯-苯乙烯共聚物(ABS)及玻璃纤维(GF)为原料,以环氧树脂作为界面相容剂,研究了界面相容剂对玻璃纤维增强ABS复合材料力学性能及界面粘接的影响.结果表明:加入环氧树脂,玻纤增强ABS复合材料的力学性能明显提高;随着玻纤质量分数的增加,复合材料的拉伸强度、弯曲强度、冲击强度均逐渐增加;玻纤质量分数为30%时,GF/ABS/环氧树脂复合材料的拉伸强度比未改性的复合材料的拉伸强度提高了30%,弯曲强度提高了25%,冲击强度也提高了50%.     

Toughened epoxy resin matrix for a membrane shell by wet filament winding

A toughened epoxy resin matrix was obtained with a reactive toughening agent and methyl hexahydrophthalic anhydride as a curing agent. The mechanical properties of the modified epoxy resin and its glass‐fiber‐reinforced composites were investigated systematically. The modified epoxy resin matrix possessed many good properties, including a high flexural strength (138 MPa), high elongation at break (5.2%), low viscosity, long pot life at room temperature, and good water resistance. In addition, the glass‐fiber‐reinforced composites showed a high strength conversion ratio of the glass fiber (86.7%) and good fatigue resistance. The results demonstrated that the modified epoxy resin matrix is very suitable for applications in reverse osmosis membrane shell products fabricated with wet filament winding for water treatment. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

新酚树脂的改性研究

对烯丙基新酚／ＢＭＩ树脂体系以及用它制成的玻璃纤维压塑料和炭黑增强压塑粉的性能进行了讨论，结果表明，烯丙基新酚／ＢＭＩ树脂体系具有良好的工艺性和反应性，压塑料和压塑粉的力学性能，韧性，耐热性和电气绝缘性能优良。