环氧基纤维增强复合材料的应用

举例阐述了环氧基纤维增强复合材料在国内外覆铜箔板、航空航天、运动器材、管道容器、化工防腐和结构加固6个方面的应用,以及环氧基树脂生产和研发情况,指出大力发展环氧基复合材料势在必行。     

几个高性能树脂基复合材料的研究

介绍了短纤维增强树脂基复合材料、聚酰亚胺纳米杂化薄膜材料和环氧基纳米复合材料方面的研究工作，简要概括了短玻璃纤维、短碳纤维以及与颗粒混合增强树脂基复合材料的研究结果，报道了聚酰亚胺纳米杂化薄膜材料和环氧基纳米复合材料的一些低温性能研究结果。     

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。     

纤维直径及浸润剂对高强度玻璃纤维及其复合材料性能的影响

高强度玻璃纤维是一种力学性能优异的特种玻璃纤维,是高性能复合材料三大增强纤维(碳纤维、芳纶纤维、高强度玻璃纤维)之一.本文研究了不同直径系列及不同增强环氧型浸润剂系列对400孔高强度玻璃纤维及其复合材料性能的影响关系.通过原丝拉伸断裂强力、及NOL环拉伸、剪切强度的对比发现,①JA型浸润剂在拉丝工艺匹配和复合材料性能方面均明显优于FE-5浸润剂;②纤维直径在9～13μm范围内变化时对高强度玻璃纤维复合材料的性能没有影响.     

声发射在纤维增强聚合物基复合材料中的应用进展

综述了近年来声发射(AE)技术应用于监测纤维增强聚合物基复合材料力学性能的研究进展。分析了聚合物基复合材料AE技术检测原理及特性,并总结了AE技术在分析玻璃纤维、碳纤维、其他传统纤维以及植物纤维增强聚合物基复合材料损伤、断裂过程中的应用。结合AE技术在监测纤维增强聚合物基复合材料力学性能中存在的问题对其研究趋势进行了展望。     

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。     

纤维增强环氧树脂基复合材料的研究进展

综述了纤维增强环氧树脂基复合材料的应用及研究进展,其中包括玻璃纤维(GF)增强、碳纤维(CF)增强,芳纶纤维,混杂纤维及植物纤维增强等。     

聚合物复合材料技术的现状与新动向

介绍了玻璃纤维增强复合材料、碳纤维增强复合材料、天然纤维增强复合材料、芳香族聚酰胺纤维增强复合材料的生产情况,重点讨论了纳米纤维复合材料、生物基复合材料、高性能聚合物复合材料的研发进展,对国内聚合物复合材料的发展提出了建议。     

环氧基纤维增强复合材料应用面面观

环氧树脂是优良的热固性树脂。它与目前大量应用的不饱和聚酯树脂相比,具有更优良的物理性能、电绝缘性能、耐化学腐蚀性能、耐热和粘合性能。众所周知,在国内,环氧树脂除用作粉末涂料、地坪、封装料、粘结剂以外,在纤维增强复合材料领域中,环氧树脂大显身手。它与高性能纤维:PAN基碳纤维、芳纶纤维、聚乙烯纤维、玄武岩纤维、S或E玻璃纤维复合,便成为不可替代的重要的基体材料和结构材料, 广泛运用在电子电力、航天航空、运动器材、建筑补强、压力管罐、化工防腐等六个领域。据粗略调查了解,我国目前用于环氧基纤维增强复合材料所需环氧树脂总量在15万吨左右,且每年以20%的速度增长。下面分别介绍环氧基纤维增强复合材料在各个领域中的应用现状。     

国内树脂基复材产量可达530万吨

<正>国内树脂基复材2015年产量预计达530万吨。据专家介绍,复合材料是由两种或两种以上不同物质以不同方式组合而成的,能够融合和发挥各种材料的优点,扩大材料的应用范围。树脂基复合材料就是其中的一大类。树脂基复合材料以有机聚合物为基体,添加相应的纤维增强体构成,也称纤维增强材料,是目前技术较为成熟、应用最为广泛的一类复合材料。根据纤维增强体的不同,树脂基复合材料可划分为玻璃纤维增强材料、碳纤维复合材料、芳纶纤维增强复合材料等。     

环氧树脂的改性研究进展及发展趋势

重点对环氧树脂的几种改性结构的研究进展进行了综述,并分析了不同改性结构的利与弊。最后对环氧树脂的未来研究方向和发展趋势进行了展望。     

环氧基POSS改性环氧树脂的研制与性能研究

以苯基三乙氧基硅烷(PTES)和β-3,4-环氧环己基乙基三甲氧基硅烷(A186)为原料，甲醇、乙醇混合溶液为溶剂，酸性条件下水解制得含有Si—H键的环氧基低聚倍半硅氧烷(EP-POSS)，通过傅里叶红外光谱(FT-IR)、核磁共振氢谱(¹H NMR)、核磁共振硅谱(²⁹Si NMR)等手段对其结构进行表征。用制备的EP-POSS对环氧树脂进行改性，分析了EP-POSS用量对树脂涂层附着力、耐冲击性、疏水性、耐热稳定性的影响。结果表明：当EP-POSS加入量为5%时，环氧树脂涂层附着力达到1级，耐冲击性达到50 cm，对水的接触角为90°，热稳定性大幅提升。     

Adhesion Tests Using Epoxy Quasicrystal Composites

Abstract

Quasicrystals (QC) are usually complex metal alloys with atypical structures. Due to their physical, mechanical and surface properties, quasicrystals have been widely studied. Although methods to manufacture quasicrystalline materials are well known, much effort has been expended in obtaining suitable quasicrystalline materials for use in industry. As quasicrystalline materials are very brittle, they are usually used in powder form as a reinforcement for additives in composites as well as in coating technology. In this work, Al–Cu–Fe quasicrystalline powder was used as a reinforcement in epoxy resin and the influence of the quasicrystal particles incorporation on the adhesive properties of the epoxy was investigated. Single lap joints (SLJ) adhesion tests were performed in order to assess the shear mode bond strength. Results show that the effect of QC reinforcement is not linear with respect to the adherence of the composites.     

The effect of different metallic catalysts on the coreaction of cyanate/epoxy

The curing reaction between the diepoxy and dicyanate mixed resins in the presence of three different catalysts Cu(AcAc)₂, manganese octoate, and copper octoate was investigated. The thermal behavior was monitored using differential scanning calorimeter; the transformations of structures during the isothermal and heating process were explored by Fourier transform infrared spectroscopy; the changes of the carbonic‐framework of polymer and intermediate products were analyzed by nuclear magnetic resonance. Conclusions can be drawn as follows: Similar to noncatalyzed system, the overall reaction still occurs in two steps: cyclotrimerization of cyanate ester to produce triazine rings, coupled with the formation of some secondary intermediate products, and coreaction of epoxy and triazine rings to form oxazolidinone rings at high temperature. The catalysts can accelerate the curing process and decrease the curing temperature as well as gel time, and manganese octoate presents the best effect on curing rate. But the mechanisms and the structures of intermediate products of metallic‐catalyzed epoxy/cyanate are not changed by the addition of catalysts. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2293–2302, 2006     

光固化涂料用低粘度环氧丙烯酸酯的研究

采用双羟基化合物与环氧树脂进行反应,制取低粘度改性环氧树脂,然后用丙烯酸酯化,制得光固化涂料用低粘度环氧丙烯酸酯。研究了催化剂类型和用量对环氧树脂改性反应,以及不同结构、不同链长双羟基化合物和双羟基化合物与环氧树脂当量比对环氧丙烯酸酯粘度及其配制的光固化涂料的性能影响。确定了环氧树脂改性反应和丙烯酸酯化反应的最佳条件。     

聚氨酯-环氧树脂复合体系的制备及性能研究

利用甲苯二异氰酸酯（TDI）与聚醚多元醇N-330及聚四氢呋喃二元醇（PF-15）为原料,制得了结构不同的聚氨酯预聚体。进一步将其与环氧树脂（E-51与E-20）进行接枝反应,最后加入固化剂双氰胺,制成了一系列环氧树脂-聚氨酯（EPR-PU）复合体系。详细考察了环氧树脂与聚氨酯预聚体的结构及用量、触变剂白碳黑的用量对EPR-PU体系性能的影响。结果表明,当原料组成的质量比为m（E-51）∶m（E-20）∶m（PU-D）∶m（PU-A）=3∶2∶0.06∶0.54时,所得EPR-PU体系同时具有较高的剪切、剥离及断裂强度。     

Toughening of epoxy resins with aromatic polyesters

Polyesters, prepared by direct polycondensation from bisphenol A and aliphatic dicarboxylic acids [adipic acid (AD), suberic acid, sebacic acid (SE), and dodecanedioic acid], were used to improve the toughness of the diglycidyl ether of the bisphenol A/diaminodiphenyl methane epoxy system. Polyesters had the number average molecular weight (M_n) ranging from 4300 to 19,200 g/mole. The epoxy systems modified with the AD system (M_n = 6400 g/mole) and the SE system (M_n = 10,200 g/mole) showed phase separated structures with discrete domains of 0.2 μm, but other systems showed smooth fracture surfaces when observed by scanning electron microscopy. The modified epoxy systems except for the AD system and SE system showed two tan δ peaks corresponding to the α and β transitions of the epoxy resin. The modified epoxy systems showed maximum values of K_1c at around 10 wt % of polyester and maximum flexural properties at 5 wt % of polyester. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2464–2473, 2000     

Effect of copper on the curing and structure of a DICY‐containing epoxy composite system

The curing and structure of an epoxy system containing dicyandiamide (DICY) as hardener were studied as a function of temperature and the presence or absence of copper with the use of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy in photoacoustic mode (FTIR‐PAS). Spectroscopic analysis of specimens taken from the DSC helped to clarify the reaction mechanism in terms of the different schemes that have been proposed. The initial stages, corresponding to the first peak in the DSC exotherm, involve the usual epoxide‐amine reactions closely followed by a reaction between DICY nitrile groups and hydroxyl groups to form structures containing iminoether and urea groups. These reactions are slightly retarded in the presence of copper. At higher temperatures, corresponding to the second peak in the exotherm, these structures are transformed into others believed to contain urethane ester groups. This reaction, which may be considered to constitute a form of degradation, is significantly accelerated in the presence of copper. The effect is particularly large around 180°C, a temperature commonly used to cure such systems, so the results have important practical implications, for example, in the lamination of circuit boards. © 2000 Government of Canada. Exclusive worldwide publication rights in the article have been transferred to John Wiley & Sons, Inc. J Appl Polym Sci 75: 1458–1473, 2000     

纳米SiO_2的表面改性及其在环氧丙烯酸酯中的应用

以甲基丙烯酸异氰酸乙酯(IEM)作为改性剂对纳米SiO2表面进行改性,探讨了相关因素对反应的影响。通过傅立叶红外光谱、热重分析和扫描电子显微镜对改性前后纳米SiO2的表面化学结构、热性能以及在溶液中的分散情况进行了分析表征,考察了改性后的纳米SiO2对环氧丙烯酸酯(EA)力学性能的影响。结果表明,改性后的纳米SiO2分散性较好,对EA的力学性能有较大改善,能同时达到增强增韧的效果。     

Influences of the alkoxy group number and treatment condition on the structure of glycidoxy functional silane-treated layer on silica particles analyzed by 1H pulse NMR

The surface treatment of spherical silica particles using a silane coupling agent with a glycidoxy group was conducted and the effect of the alkoxy group number on the molecular mobility of the silane chain was investigated by ¹H pulse nuclear magnetic resonance (NMR). Silanes with di-alkoxy and tri-alkoxy structures were used, and the silica particles were treated with 2-propanol solution and heated at 120?°C for 24?h after solvent evaporation. The surface coverage of the silica surface was in the range from two to three layers. For multilayer coverage, linear chain and network structures were expected to form on the surface by polycondensation reaction using the di- and tri-alkoxy structures, respectively. However, the relaxation times for silane chains with both di- and tri-alkoxy structures measured by pulse NMR were short, which indicates that both silane chains formed rigid network structures. Fourier transform infrared spectroscopic analysis revealed that ring opening of the epoxy group occurred, followed by reaction to form the network structure, even with the di-alkoxy structure. Ring opening of the epoxy group could be reduced by setting the heating temperature at 80?°C. There was a significant difference in flexibility between the silane-layers with di- and tri-alkoxy structures after heating at 80?°C, as reflected by the relaxation time.