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研究了风电叶片用低黏度环氧树脂在70℃、90℃和110℃固化温度下固化物的性能变化。气相色谱–质谱分析低黏度环氧树脂主要由双酚A环氧树脂和1,4–丁二醇二缩水甘油醚组成,固化剂为多元胺的成分,再通过红外光谱对70℃、90℃和110℃3组样件进行分析,结果显示,随着固化温度升高,固化物中起到体型网络交联的醚键的含量呈下降趋势,同时羰基和亚甲基含量增加,这些都说明在此固化温度区间内,固化温度升高,高分子的交联度呈下降趋势。对环氧浇铸体和玻璃钢样件的力学性能测试显示,从70℃到110℃固化温度升高样件的各项力学性能呈下降趋势。 相似文献
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The joint effect of chemical functionalization and polymer melt blending conditions on carbon nanotube dispersion in polypropylene, as well as its influence on the electrical and mechanical properties of the resulting composites were investigated. Melt blending was performed using a prototype twin screw extruder enabling sampling along the barrel. The carbon nanotube dispersion was assessed by optical and scanning electron microscopy. The functionalization reaction was tailored for compatibility with the polymer, and characterized by X-ray photoelectron spectroscopy. In particular, nanotubes covalently bonded to polypropylene showed distinctive dispersion ability, while the carbon nanotube dispersion remained stable even after re-melting. However, the polypropylene-functionalized nanotubes produced composites with higher electrical resistivity, possibly due to the insulating effect of the polymer bonded to the nanotubes surface. 相似文献
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累托石/NR纳米复合材料的结构与性能研究 总被引:4,自引:2,他引:2
研究乳液法和熔体法制备的累托石/NR纳米复合材料的结构与性能。结果表明,乳液法累托石/NR纳米复合材料为层间无高分子插入的隔离型纳米复合材料,熔体法累托石/NR纳米复合材料为典型的插层型纳米复合材料;当应变小于100%时,熔体法制备的复合材料应力较大,当应变大于100%时,乳液法制备的复合材料应力较大;当累托石用量较小时,乳液法制备的复合材料撕裂强度高于熔体法制备的复合材料;乳液法和熔体法制备的两种复合材料热稳定性差别不大,均好于纯NR。 相似文献