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无规羧基丁腈橡胶改性环氧树脂 总被引:5,自引:0,他引:5
介绍以无规羧基丁腈橡胶为增韧剂,用三乙醇胺、低分子量聚酰胺等为固化剂改善环氧树脂阻尼性能的方法。利用扫描电子显微镜等研究了环氧树脂/丁腈橡胶体系的微观结构形态以及橡胶种类、用量等对增韧效果的影响。 相似文献
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以无规则羧基丁腈橡胶(RCBN)为改性剂,对羧基丁腈橡胶改性环氧树脂的制备工艺及产品性能进行了研究。利用红外光谱及化学分析法等手段,探讨了催化剂用量、反应温度和反应时间对改性环氧树脂性能的影响;通过固化产物力学性能分析,对改性环氧树脂固化性能进行了评价。结果表明:质量配比为环氧树脂:RCBN:催化剂为100:15:0.3的反应体系中于120℃,反应150min,获得了环氧值0.40、黏度(40℃)90—95Pa·s、酸值小于0.4mg/g的改性环氧树脂产品,改性环氧/改性胺411固化产物剪切强度为18.41MPa,断裂伸长率为4.41%;无规则羧基丁腈橡胶对环氧树脂有显著的增韧效果。 相似文献
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用液态丁腈橡胶(LNBR)对环氧树脂(EP)进行增韧改性,制备出LNBR/EP复合材料。通过对不同含量LNBR的环氧树脂复合材料力学性能测试,结果表明:当LNBR含量为20 phr时,复合材料冲击强度、拉伸强度和断裂伸长率达到23.6 KJ/m2、60.2 MPa和26.32%;利用SEM对复合材料分析得到LNBR增韧使环氧树脂从脆性断裂变为韧性断裂;利用差示扫描量热法对复合材料的热性能分析得到:随着LNBR份数增多,体系Tg温度逐渐降低。 相似文献
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树脂类结合荆工具,是超硬材料制品分类中的重要组成部分之一.为了改善环氧树脂的综合应用性能,试验以纳米氢氧化铝作为增强体,分析评价了制备的纳米复合材料的阻燃和机械性能.试验结果表明,油酸钠是氢氧化铝改性的有效表面活性荆,其在氢氧化铝中的添加量达到1%时改性效果最好,氢氧化铝的活化指数可以达到98.21%.复合材料的阻燃性能随着氢氧化铝填充量的增大而提高,而机械性能则随填充量的增大先提高后减小.为使复合材料有较佳的综合性能,纳米氢氧化铝在环氧树脂中的适宜填充量为60%~80%. 相似文献
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橡胶弹性体增韧环氧树脂的研究进展 总被引:1,自引:0,他引:1
综述了环氧树脂增韧改性的研究现状,详细介绍了丁晴橡胶、丙烯酸酯橡胶和聚氨酯弹性体增韧环氧树脂的研究进展,展望了橡胶弹性体增韧环氧树脂的前号。 相似文献
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In this article, the structure and properties of the epoxy resin (EP) modified by polyurethane (PU) prepolymers were studied. The three types of polyurethane prepolymers, namely, polycarbonate-type PU (TPC), polyether-type PU, and polycarbonate–polyether-type PU were employed. The samples were analyzed by means of an infrared spectrometer, a differential scanning calorimeter, a scanning electron microscope, a transmission electron microscope, a scanning tunnel microscope, and a thermal gravimeter. The results show that the EP modified by TPC is of excellent thermal resistance and mechanical properties. Specifically, when the ratio of PU to EP is 10/100 (wt/wt), optimal properties are achieved. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 887–893, 1998 相似文献
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Rubber-modified epoxy adhesives are used widely as structural adhesive owing to their properties of high fracture toughness. In many cases, these adhesively bonded joints are exposed to cyclic loading. Generally, the rubber modification decreases the static and fatigue strength of bulk adhesive without flaw. Hence, it is necessary to investigate the effect of rubber-modification on the fatigue strength of adhesively bonded joints, where industrial adhesively bonded joints usually have combined stress condition of normal and shear stresses in the adhesive layer. Therefore, it is necessary to investigate the effect of rubber-modification on the fatigue strength under combined cyclic stress conditions. Adhesively bonded butt and scarf joints provide considerably uniform normal and shear stresses in the adhesive layer except in the vicinity of the free end, where normal to shear stress ratio of these joints can cover the stress combination ratio in the adhesive layers of most adhesively bonded joints in industrial applications.In this study, to investigate the effect of rubber modification on fatigue strength with various combined stress conditions in the adhesive layers, fatigue tests were conducted for adhesively bonded butt and scarf joints bonded with rubber modified and unmodified epoxy adhesives, wherein damage evolution in the adhesive layer was evaluated by monitoring strain the adhesive layer and the stress triaxiality parameter was used for evaluating combined stress conditions in the adhesive layer. The main experimental results are as follows: S–N characteristics of these joints showed that the maximum principal stress at the endurance limit indicated nearly constant values independent of combined stress conditions, furthermore the maximum principal stress at the endurance limit for the unmodified adhesive were nearly equal to that for the rubber modified adhesive. From the damage evolution behavior, it was observed that the initiation of the damage evolution shifted to early stage of the fatigue life with decreasing stress triaxiality in the adhesive layer, and the rubber modification accelerated the damage evolution under low stress triaxiality conditions in the adhesive layer. 相似文献
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