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PA6/OMMT/SiO2纳米复合材料的制备及力学性能研究 总被引:3,自引:0,他引:3
以天然蒙脱土为原料,11-氨基酸作为有机插层剂与蒙脱土层间的阳离子进行交换制备OMMT,用原位聚合法制备PA6/OMMT/SiO2纳米复合材料,用X射线衍射仪、FT-IR光谱仪、差示扫描量热仪等对OMMT、纳米复合材料的结构及力学性能进行表征。结果发现,添加3%(质量含量,下同)OMMT的PA6/OMMT复合材料的拉伸强度、弯曲强度和弯曲模量较纯PA6分别提高了19%、13.8%、14%;而纳米SiO2的加入使纳米复合材料的拉伸和弯曲强度、刚性和韧性得到提高的同时,明显改善了蒙脱土使纳米复合材料缺口冲击强度下降的趋势,当纳米SiO2含量为1%时,缺口冲击强度提高了近33.5%。 相似文献
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In order to improve the stress corrosion cmcking(SCC) resistance of 7A05Al alloy, four different heat treatment processes were performed. After the heat treatments, the stress corrosion cracking resistance, mechanical properties and microstructures of 7A05Al alloys were studied. The results show that the retrogression and reaging(RRA) treated specimens possess the highest SCC resistance with slightly reduced strength compared with the other specimens. Thus RRA is the best process in terms of the optimal combination of SCC resistance and strength. Further TEM observation reveals that the RRA treated specimens are characterized by the fine equiaxed grains, dispersed second phase and wide PFZ. The pre-aging treated specimens show lower SCC resistance but higher strength as compared with the RRA treated ones. Equiaxed grains are also observed in the pre-aging treated samples by TEM, indicating that the anisotropy is eliminated. However, the dual aging and deformation plus aging treated specimens are demonstrated by large anisotropy. 相似文献
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有机插层剂对聚酰胺6/MMT纳米复合材料制备的影响研究 总被引:1,自引:0,他引:1
以烷基胺、季铵盐和氨基酸作为有机插层剂与蒙脱土片层进行阳离子交换,制备出层间距不同的有机蒙脱土。采用熔融插层法和原位聚合法分别制备聚酰胺(R%)/蒙脱土(MMT)纳米复合材料,并利用XRD、FT-IR、TEM对有机蒙脱土及纳米复合材料进行结构表征。研究结果表明:用烷基胺、季铵盐和氨基酸有机插层剂改性的蒙脱土层间距由原来的1.25nm分别增大到3.21nm、3.99nm和1.82m;季铵盐有机插层剂更适用于熔融插层法制备PA6/MMT纳米复合材料,而氨基酸有机插层剂更适用于原位聚合法制备PA6/MMT纳米复合材料。 相似文献