A Solder Alloy Filled Z-Axis Conductive Epoxy Adhesive

Epoxy adhesives filled with four different volume fractions of eutectic tin-bismuth solder alloy were prepared and the effect of filler content on the electrical and mechanical properties of these anisotropic electrically conductive adhesives was investigated. The results show that the adhesive containing the lowest amount of the filler alloy had the best combination of conductivity, insulation resistance and shear strength. The DSC-measurements suggested that the filler melts before the cure of the resin begins which allows the filler to wet and bond well to the conductors. This was verified by SEM/EPMA examinations. A temperature cycling test and high humidity, high temperature treatment were conducted on the best composite adhesive. The temperature variation had no effect on conductivity of the joints while humid and hot environment decreased the conductivity.     

环氧丙烯酸酯涂料的紫外固化研究

采用E-44环氧树脂与丙烯酸反应，用翁盐作催化剂，制备了适于配制竹木基涂饰的紫外光固化的环氧丙烯酸酯预聚物，讨论了催化剂的种类对合成反应的影响。对固化产物进行了红外表征。光引发剂种类和交联剂含量对固化速率的影响、光引发剂含量对凝胶含量的影响、灯距对固化时间的影响、固化时间对涂膜性能的影响也进行了讨论。     

Curing of mixtures of epoxy resins and 4‐methyl‐1,3‐dioxolan‐2‐one with several initiators

Diglycidyl ether of bisphenol A or 3,4‐epoxycyclohexylmethyl 3,4‐epoxycyclohexane carboxylate were mixed with different proportions of 4‐methyl‐1,3‐dioxolan‐2‐one and cured using lanthanide triflates as initiators. In order to compare the materials obtained, conventional initiators such as boron trifluoride complexes and N,N‐dimethylaminopyridine were also tested. The curing process was followed by differential scanning calorimetry (DSC) and Fourier transform IR in attenuated total reflectance mode. This technique proved that the carbonate accelerates the curing process because it helps to form the active initiating species, although it was not chemically incorporated into the network and remained entrapped in the material. The DSC kinetic study was also reported. © 2006 Wiley Periodicals Inc. J Appl Polym Sci 102: 2086–2093, 2006     

用增钙粉煤灰配制高强混凝土的试验研究

本文探讨了利用增钙粉煤灰配制高强混凝土的可行性。研究结果表明，增钙粉煤灰的品质，取代水泥率等因素对混凝土的性能产生直接影响，采用品质较好的增钙粉煤灰取代２０％左右的水泥（超量系数为１．２），可配制Ｃ６０等级的高强混凝土，其它物理力学性能均满足高强混凝土要求。     

Hygrothermal aging of rubber‐modified and mineral‐filled dicyandiamide‐cured DGEBA epoxy resin. III. Dielectric spectroscopy investigation

The effects of moisture absorption on the dielectric properties of a rubber‐modified, mineral‐filled, epoxy resin based on the diglycidyl ether of bisphenol A cured with dicyandiamide are reported. Samples of the resin were aged by immersing in deionized water, or 5% w/w NaCl solution, at elevated temperatures. Dielectric measurements were carried out over the frequency range 10^?1 to 6 × 10⁵ Hz. A featureless dielectric spectrum was observed with both real and imaginary dielectric permittivity increasing with the amount of absorbed water. The change in the dielectric properties with absorption of water was independent of presence of salt, temperature of exposure, and aging history, although a hysteresis of the hydration–dehydration process was observed at low frequencies. Two types of absorbed water were observed—water molecularly dispersed within the epoxy matrix and clustered water in spherical microcavities. The time dependence of the real dielectric permittivity measured at 10 kHz was found to closely resemble that of the water absorption, which allowed the activation energy of diffusion to be calculated from both dielectric and gravimetric data. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1011–1024, 2002; DOI 10.1002/app.10368     

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。     

混合催化剂合成水性环氧丙烯酸酯的研究

通过环氧丙烯酸树脂和双羟基化合物反应,获得具有亲水性链段的水性环氧丙烯酸酯。研究了催化剂用量和反应温度对转化率的影响,确定了以混合催化剂的最佳反应条件。采用FT-IR红外光谱对所合成的数值进行了表征,实验结果表明可以获得目的产物。     

纳米有机蒙脱土改性邻甲酚醛环氧树脂的研究

利用插层复合技术制备了邻甲酚醛环氧树脂／蒙脱土纳米复合材料，对固化产物利用X射线衍射(XRD)分析有机蒙脱土的层间距变化。通过对复合材料的力学性能测试表明，少量有机化蒙脱土的加入可以较大地提高材料的拉伸强度和冲击强度，起到了同时增韧增强的作用。并且环氧树脂／蒙脱土复合材料的热分解温度和热变形温度也有明显提高。     

炭黑－环氧树脂导电复合材料的研究

本文研究了炭黑－环氧树脂复合材料的制备工艺及炭黑填充率对材料电阻率的影响。实验结果表明，加入表面活性剂，明显改善了炭黑在环氧树脂中分布的均匀性。炭黑－环氧树脂材料具有明显的渗流效应，正温度系数效应即ＰＴＣ效应，非线性伏安特性和电磁波屏蔽效应。     

双组分环氧胶粘剂在我厂的应用

简单介绍了双组分环氧胶粘剂的特点、组成及固化反应机理 ,并且详细叙述了我厂双组分环氧胶粘剂的组分、配制工艺和灌胶工艺以及讨论了双组分环氧胶粘剂在我厂的应用情况 ,为我厂的军品及民用电器产品的灌封胶接提供了广泛的前景