玻璃纤维／环氧树脂基复合材料界面介电性能的研究

本文研究了五种偶联剂对玻璃纤维／环氧基复合材料界面介电性能的影响。结果表明，玻璃纤维经偶联剂处理后，其浸润活化能降低，从而提高了玻璃纤维／环氧基复合材料界面的介电性能，其提高的幅度大小与偶联剂的极性及化学结构有关。本文还研究了温度和水煮时间对五种偶联剂处理前后的玻璃纤维／环氧基复合材料界面介电性能的影响。结果表明，其影响的强度与界面的极化强度成正比。     

玻璃纤维表面偶联剂处理对GFRP电学和力学性能的影响

GFRP复合材料的电学性能和力学性能强烈地受到玻璃纤维与基体树脂间键接强度的影响。要想提高GFRP复合材料的性能必须提高玻璃纤维/基体复合界面的粘接强度,进而采用有效的偶联剂也是必要的。本文通过对用五种不同偶联剂处理过的玻璃纤维对玻璃纤维/环氧单向层板电学性能和力学性能的影响进行了研究。结果表明:用沃兰处理剂的GFPR复合单板具有极低的介电损耗和较高的击穿强度;用A—1160处理剂的GFRP复合单板除具有较高的击穿强度外,还具有优异的力学性能。     

低成本高频电路用覆铜板的研制

本文介绍了国内外高频电路用覆铜板的技术进步,着重研究了一种环氧改性异氰酸酯类粘合剂,结果表明采用该粘合剂／E型玻璃纤维布制备的层压板产品具有成本低,介电性能良好等特点。     

聚硫密封剂介电性能研究

研究了聚硫生胶、补强填料、树脂及偶联剂对聚硫密封剂力学性能及介电性能的影响,此外还对比了不同试样厚度对密封剂介电强度的影响.试验结果表明:未改性的液体聚硫橡胶的介电强度比改性聚硫橡胶高,综合考虑粘度、力学性能及工艺性能,选择改性胶与未改性胶共混作为生胶;气相二氧化硅作为补强填料时密封剂的介电性能比沉淀二氧化硅好;添加环氧树脂、酚醛树脂、环氧类偶联剂均可提高密封剂的介电强度,但需综合考虑密封剂的储存问题;密封剂试样厚度对其介电性能影响较大,可根据需要选择合适的材料厚度.     

偶联剂对制备环氧-低熔点金属复合材料的影响

通过相反转法制备环氧-低熔点金属复合材料。采用偶联剂改善了低熔点金属在基体中的分散性,利用扫描电子显微镜和数字电桥研究了金属粒子分散性对复合材料结构和性能的影响。结果表明,采用相反转法和合适的偶联剂能使低熔点金属均匀地分散在环氧树脂基体中,有效地增加复合材料的介电性能。     

聚四氟乙烯覆铜板的制备及性能研究

本文制备了玻璃纤维布增强聚四氟乙烯覆铜板;分析了偶联剂对预浸片性能的影响。讨论了树脂含量对预浸片介电性能和弯曲强度的影响;探讨了纤维布含量对剥离强度的影响。对覆铜板介电性能理论值与试验值进行了对比分析。结果表明,选用6032硅烷偶联剂处理玻璃纤维布、树脂含量为70%时得到综合性能好的聚四氟乙烯覆铜板。预浸片介电常数的理论值与试验值较吻合,预浸片介质损耗因子理论值与试验值相差较大。     

PMI泡沫塑料及其夹层结构的高频介电性能研究

本文研究了密度和厚度对PMI泡沫塑料及其碳纤维、玻璃纤维夹层结构10GHz的高频介电性能的影响。结果表明,PMI泡沫塑料的厚度对其高频介电性能影响不大;随着密度的增加,PMI泡沫塑料的高频介电性能呈近线性规律增大,并与理论计算值基本一致;随着厚度的增加,其碳纤维夹层结构和玻璃纤维夹层结构的高频介电性能均不断降低,并逐渐接近纯PMI泡沫塑料的介电性能,其规律符合串联公式模型;玻璃纤维夹层结构的高频介电性能低于碳纤维夹层结构。     

增韧型硅烷偶联剂在复合材料中的应用

复合材料是指由基体树脂、增强材料（填料、玻璃纤维）、功能性助剂（偶联剂、脱模剂、增韧剂）等经过特定设备加工而成的材料,主要有不饱和聚酯复合材料、酚醛模塑料、环氧塑封料、环氧灌封料、环氧浇注料、环氧玻璃纤维布等。其特点为：高强度、高电性能、成型性好等。     

5528氰酸酯树脂基玻璃纤维增强复合材料性能研究

本文对新型的5528改性氰酸酯树脂基玻璃纤维增强复合材料的耐热性能、力学性能、耐湿热性能、介电性能进行研究，结果表明：5528氰酸酯树脂基玻璃纤维增强复合材料具有良好的力学性能和介电性能。其中石英玻璃纤维增强复合材料的介电常数为3．40，介电损耗正切值为0．00393，并且对频率显示出优秀的稳定性；而高强玻璃纤维增强复合材料的介电损耗正切值为0．00925，远远优于环氧和双马树脂基复合材料。5528氰酸酯基玻璃纤维复合材料适合高性能透波材料或高频印刷电路板应用。     

GB/HDPE复合材料拉伸性能及介电性能研究

采用小粒径玻璃微珠（GB）与HDPE熔融共混,研究了玻璃微珠用量及表面处理对复合材料拉伸性能及介电性能的影响。研究结果表明,无论玻璃微珠表面处理与否,GB／HDPE复合材料的拉伸强度和拉伸弹性模量均随着玻璃微珠用量的增加而增大;经过偶联剂KH550和EB151处理的玻璃微珠与HDPE复合后,拉伸强度和拉伸弹性模量有一定的提高。复合材料的介电常数随玻璃微珠用量增加呈现增大的趋势,经过改性的复合材料的介电常数比未经改性的有所增加,而玻璃微珠的添加和界面改性对介电损耗的影响不大。     

Effect of coupling agents on the mechanical properties of mica/epoxy and glass fiber/mica/epoxy composites

The effect of coupling agents, two silane and one zirconate, on the mechanical properties of mica/epoxy and glass fiber/mica/epoxy composites has been investigated. The results showed that tensile modulus and flexural strength and modulus values were improved by the surface treatment of the coupling agents. The property retention was also found to be better in the case of coupling agent-treated mica/epoxy samples after boiling in water for 2h. In the case of glass fiber/mica/epoxy composites, the flexural modulus and interlaminar shear strength values improved with increase in mica content, but the effect of coupling agents was not pronounced.     

Processing of composites with titanate coupling agents—a review

It is proposed that titanium-derived coupling agents react with free protons at the inorganic interface to form organic monomolecular layers on the inorganic surface, which causes inorganic/organic phase compatibilization resulting in new composite property, catalysis, adhesion, and rheology performance standards. Processing techniques and rheology effects using titanates are discussed. The injection pressures of CaCO₃, carbon black filled polystyrene, and glass-fiber, talc-filled poly(phenylene sulfide) are shown to be reduced 50 percent by use of cumyl phenyl type titanate. Adhesion effects are discussed in many composites such as epoxy/aluminum, acrylic/slate, carbon fiber/polyester, etc., followed by data showing significant property improvements in 1/16 inch milled glass fiber and Wollastonite RRIM urethane, printed circuit boards and amide and anhydride cured aramid fiber-reinforced epoxy.     

表面处理对玻纤/碳纤增强橡胶基密封复合材料性能的影响

采用压延成张工艺制备碳纤维和玻璃纤维混杂增强非石棉橡胶基密封复合材料(NAFC),以横向抗拉强度作为表征混杂增强橡胶基密封材料中纤维与橡胶界面粘结性能的指标.通过扫描电镜(SEM)对材料横向拉伸试样断口进行形貌分析,及对材料的耐油、耐酸、耐碱性能进行测试,探讨了不同表面处理工艺对纤维与基体界面粘结效果的影响.研究结果表明,对玻璃纤维采用偶联剂KH-550浸渍后涂覆环氧树脂涂层,对碳纤维在空气氧化后涂覆环氧树脂涂层,可有效增强纤维、基体的界面粘结,所制得的混杂纤维增强复合材料具有较好的机械性能和耐介质性能.     

高能辐照对国产芳纶纤维/环氧复合材料界面性能影响

芳纶纤维因其表面惰性、光滑使其与树脂浸润性差,界面结合强度低。以环氧氯丙烷为介质1,采用60Coγ-射线辐照方法对国产芳纶纤维进行表面改性,以界面剪切强度（IFSS）和层间剪切强度（ILSS）表征芳纶/环氧复合材料界面结合性能。结果表明在400kGy辐照剂量下改性效果最好;经高能辐照处理的芳纶纤维表面能升高,并失去了原有的光滑表面,且纤维表面氧含量有大幅度提高,使得纤维表面活性增大。     

Effects of organo‐montmorillonite on the mechanical and morphological properties of epoxy/glass fiber composites

Epoxy composites filled with glass fiber and organo‐montmorillonite (OMMT) were prepared by the hand lay‐up method. The flexural properties of the epoxy/glass fiber/OMMT composites were characterized by a three‐point bending test. The flexural modulus and strength of epoxy/glass fiber were increased significantly in the presence of OMMT. The optimum loading of OMMT in the epoxy/glass fiber composites was attained at 3 wt%, where the improvement in flexural modulus and strength was approximately 66 and 95%, respectively. The fractured surface morphology of the epoxy/glass fiber/OMMT composites was investigated using field emission scanning electron microscopy. It was found that OMMT adheres on the epoxy/glass fiber interface, and this is also supported by evidence from energy dispersive X‐ray analysis. Copyright © 2007 Society of Chemical Industry     

用于辐照改性的PBO纤维复合材料的树脂体系配方设计及其性能研究

结合γ-射线辐照改性PBO纤维表面技术,将辐照介质(接枝体化合物)作为树脂基体的一个成分设计出环氧树脂基体配方.通过浸润试验、树脂浇铸体力学试验、纤维湿法缠绕工艺试验和Microbond界面剪切试验等方法研究了树脂基体的各项性能.结果表明,与另外几种常用的树脂基体相比,本文设计的树脂基体与表面改性PBO纤维的浸润性能和界面粘接性能有明显的提高.树脂浇铸体力学性能满足高性能纤维复合材料的要求.     

Effects of solvent and temperature on the coupling agent/epoxy resin interface

Increased wetting of the coupling agent/epoxy resin interface was observed when γ-glycidoxypropyltrimethoxysilane, polyfunctional aminosilane and γ-aminopropyltriethoxysilane were applied respectively from methyllethylketone, dimethylformamide and water on woven glass cloths which had been cleaned at 300°C. However, when factory-applied coupling agents were burnt off the woven cloths and fresh coupling agents re-applied, it was found that the nature of the factory-applied coupling agent influenced subsequent wetting. Thinner glass fibres showed a greater improvement in wetting rate than thicker fibres in those solvents identified to be good for improved wettability, irrespective of the heat-cleaning temperature.     

偶联剂对短玻纤增强PA66微观结构及性能影响研究

利用双螺杆挤出机制备短玻纤增强尼龙66(GF／PA66)复合材料，研究多种偶联剂对GF／PA66的微观结构及性能的影响。结果表明，偶联剂的加入，不仅使GF在PA66基体中基本呈均匀分布，而且使材料的结构及性能有较大的改善；复合偶联剂All00 A B的改性效果优于单独使用A1100；复合偶联剂中All00的最佳含量为1．5％；随着GF含量的增加，材料的综合性能提高，但当GF含量大于35％时，材料的综合性能开始有所降低；All00 A B改性的GF／PA66的失效机理为界面的脱粘、脱粘后的摩擦和纤维的拔出。     

THE INFLUENCE OF SILANE COUPLING AGENT COMPOSITION ON THE SURFACE CHARACTERIZATION OF FIBER AND ON FIBER-MATRIX INTERFACIAL SHEAR STRENGTH

It is well known that the fiber-matrix interface in many composites has a profound influence on composite performance. The objective of this study is to understand the influence of composition and concentration of coupling agent on interface strength by coating E-glass fibers with solutions containing a mixture of hydrolyzed propyl trimethoxysilane (PTMS) and γ-aminopropyl trimethoxysilane (APS). The failure behavior and strength of the fiber-matrix interface were assessed by the single-fiber fragmentation test (SFFT), while the structure of silane coupling agent was studied in terms of its thickness by ellipsometry, its morphology by atomic force microscopy, its chemical composition by diffuse reflectance infrared Fourier transform (DRIFT), and its wettability by contact angle measurement. Deposition of 4.5 ×10 -3 mol/L solution of coupling agent in water resulted in a heterogeneous surface with irregular morphology. The SFFT results suggest that the amount of adhesion between the glass fiber and epoxy is dependent not only on the type of coupling agent but also on the composition of the coupling agent mixture. As the concentration of APS in the mixture increased, the extent of interfacial bonding between the fiber and matrix increased and the mode of failure changed. For the APS coated glass epoxy system, matrix cracks were formed perpendicular to the fiber axis in addition to a sheath of debonded interface region along the fiber axis.     

Einfluß der Faserbehandlung auf das Feuchteverhalten von glasfaserverstärkten Epoxidharzen

The strength of glass fiber reinforced epoxy resins can be significantly reduced under exposure to moisture. Besides other factors, the interface between fiber and matrix plays an important role. It is responsible for a proper load transfer between fibers and matrix by coupling effects and significantly affects the moisture behavior of the composite. In the present study, glass fibers were treated with different sizes under defined conditions and embedded in three epoxy matrix systems. The composites were exposed to different moisture conditions. The change of the shear and impact behavior due to moisture was determined. It will be shown that the composites with coupling agent treated fibers are significantly more resistant to moisture than composites with poor fiber/matrix adhesion. Furthermore, it will be shown that also the binder plays an important role if the material is subjected to moisture.