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Epoxy resin was cured with a tertiary amine. The viscosity and dynamic mechanical properties during the curing reaction were measured by a cone-and-plate rheometer. A dual Arrhenius viscosity model was modified to predict the viscosity profile before gelation during the non-isothermal curing. The viscosity profile coincided with the experimental data. The activation energy of this system calculated using the modified model was 19.8 kcal mol–1 for the first region, and 17.3 kcal mol–1 for the second region. After gelation, the dynamic complex modulus was related to the reaction kinetics according to the rubber elasticity theory, and the activation energy was 15.3 kcal mol–1. Furthermore, the gelling point can be estimated from the rheological measurements. 相似文献
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M. Nagasawa H. Kinuhata H. Koizuka K. Miyamoto T. Tanaka H. Kishimoto T. Koike 《Journal of Materials Science》1995,30(5):1266-1272
In static bending fatigue tests, epoxy resins show practically no fatigue if the stress given to specimen is lower than a critical value, which is close to the bending strength of the specimen. In cyclic bending fatigue tests, on the other hand, the resins are easily fractured even though the stresses are far below the critical values. Some strain may be accumulated on the surface of specimen through cyclic deformations. However, the strain accumulated is reversible. If the specimen is allowed to rest, the strain disappears. If the strain reaches a critical value, an irreversible transition may be induced, probably in the arrangement of segments on the surface. A crack nucleus thus created may propagate and cause the final fracture of the specimen, following the fracture mechanics of elastic materials. The lifetime of epoxy resins under cyclic bending load is determined by the time required for creating a crack nucleus on surface. 相似文献
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Specimens, cut from a commercially produced epoxide resin reinforced by layers of glass cloth, were tested in tension at various strain-rates and temperatures, and at various orientations of the fibres to the tensile axis. Results are presented for elastic moduli, yield and fracture stresses, and elongations. These results give ample evidence of a decrease in the effectiveness of the reinforcement as deformation proceeds. Strain-ratechange tests show that the rate sensitivity of the composite rises rapidly as the strain increases beyond a critical value, which also indicates that the behaviour is increasingly governed by the properties of the matrix. 相似文献
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Post-yield behaviour, particularly strain softening, has been studied here for an epoxy resin to examine the effects of postcuring and plasticization by water and a non-volatile diluent dibutylphtalate. The significance of necking was examined by conducting compression tests (at room temperature) as well as tensile tests. In the case of tensile tests, elevated temperatures were used in order to achieve yielding. The amount of strain softening was found to be reduced by postcuring or by the addition of a plasticizer. In the case of postcuring, little change in yield stress occurred, whereas, with plasticizers, a reduction in yield stress does occur. 相似文献
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采用以超临界CO2为物理发泡剂的固态间歇发泡技术制备了环氧树脂微孔材料,利用SEM和DSC研究了环氧树脂微孔材料的制备工艺,分析了发泡前后环氧树脂的力学性能和介电性能。结果表明:环氧树脂片材的预固化度为75%~85%时,气体浓度达到5.11%~5.43%,气体饱和时间为48 h,泡孔排列紧密尺寸均匀。发泡温度的提高和发泡时间的延长会使环氧树脂微孔材料的平均泡孔直径逐渐增大,泡孔密度逐渐降低。当环氧树脂片材预固化度为75%、发泡温度为120 ℃、发泡时间为10 s时,环氧树脂微孔材料的平均泡孔直径为10.6 μm,泡孔密度为1.03×109 个/cm3,泡孔呈均匀致密的球形或多边形结构。与未发泡材料相比,环氧树脂微孔材料的断裂伸长率和冲击强度分别提高了43%和39%,介电常数降低了42%,介电损耗降低了50%。 相似文献
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海因环氧树脂是由海因或其衍生物经缩水甘油化而得到的含有乙内酰脲杂环的新型特种环氧树脂,保持了环氧树脂的原有应用性能,同时乙内酰脲的杂环结构又赋予其优异的电绝缘性、耐热性、耐候性和耐磨性等特性,具有广阔的应用前景。总结了1,3-二缩水甘油基海因、缩水甘油醚类海因环氧树脂和大分子海因环氧树脂3种类型海因环氧树脂的制备方法,简要介绍了近年来关于海因环氧树脂的基本性能研究,并对其在电子封装材料、覆铜板的基板材料、绝缘材料、材料抗菌剂及其它领域的应用进行了阐述,最后探讨了海因环氧树脂在工业重防腐领域中的应用潜力。 相似文献
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将无卤膨胀阻燃剂六(4-DOPO羟甲基苯氧基)环三磷腈(DOPOMPC)、聚磷酸铵(APP)及多壁碳纳米管(MWCNTs)复配后加入环氧树脂(EP)中,制备出新型阻燃复合材料DOPOMPC-APP-MWCNTs/EP。通过极限氧指数(LOI)、水平垂直燃烧和锥形量热法研究其阻燃性能。研究结果表明:MWCNTs的加入增强了膨胀阻燃体系的阻燃性能和力学性能,并在一定程度上改善了体系燃烧时的浓烟现象。当阻燃体系总质量分数为20%,MWCNTs质量分数为2%时,材料性能最优,其LOI达到36.8%,热释放速率峰值、有效燃烧热平均值、比消光面积平均值和CO释放率平均值与未阻燃EP相比分别下降了83.5%、31.5%、47.6%、50.0%,与DOPOMPCAPP/EP相比下降了83.5%、77.7%、83.7%、68.9%。SEM分析表明:添加MWCNTs后,燃烧炭层呈现出大面积交联网络状结构。 相似文献
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氰酸酯/双马来酰亚胺/环氧树脂三元共聚物及性能研究 总被引:2,自引:0,他引:2
采用双马来酰亚胺和环氧树脂与氰酸酯共聚对氰酸酯树脂进行改性,用FTIR跟踪了其固化过程。性能测试表明,当BCE:BMI:EP为5:2:3时,其固化物的冲击强度达到了12.2kJ·cm^-2,韧性有较大的提高;改性树脂的耐热性随着EP含量的增加而下降,当EP含量为30%时,Tg为233.7℃;改性后的氰酸酯树脂在1MHz频率下的介电常数和介电损耗角正切都比纯CE的有所增加,但上涨的幅度较小,仍具有优异的介电性能;DMA分析表明,在瓦温度时,损耗因子和损耗模量达到最大值,其中,tanδmax为0.359。 相似文献
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