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采用原位聚合和混炼插层相结合技术制备了氢化丁腈橡胶/聚甲基丙烯酸镁/有机蒙脱土(HNBR/PMgMA/OMT)纳米复合材料,通过XRD,SEM和TEM等测试方法研究了HNBR/PMgMA/OMT纳米复合材料的结构、形态和性能.PMgMA离子簇与未反应完全的MgMA单体形成纳米-微米共存形态结构,PMgMA对HNBR有显著的增强效果,HNBR/PMgMA/OMT纳米复合材料具有良好的加工性能、物理机械性能和耐介质老化性能.TEM结果显示MgMA/OMT并用有助于OMT剥离分散,有机蒙脱土在硫化胶中形成以剥离和插层为主、反插层和未插层共存的微观结构;SEM显示当MgMA/OMT用量为20/10份时能明显改善复合材料的界面结合,此时纳米复合材料的拉伸强度、扯断伸长率和扯断永久变形分别为30.2 MPa,520%和30%;同时具有优异的耐热空气和耐油老化性能,耐热水性能也明显改善,在165℃的热空气、水和油中长期老化14天的老化系数分别达到0.61,0.63和0.84,其耐介质老化性能明显好于炭黑增强HNBR硫化胶及HNBR/PMgMA复合材料.良好的蒙脱土片层分散结构是提高HNBR/PMgMA/OMT纳米复合材料耐介质老化性能的主要原因.
HNBR / PMMA / OMM nanocomposites were prepared by a combination of in-situ polymerization and mixing intercalation. The XRD, SEM and TEM methods were used to study the properties of the composites. The structure, morphology and properties of HNBR / PMgMA / OMT nanocomposites were investigated.PMgMA clusters formed nanocomposite morphology with unreacted MgMA, and PMMA had a significant enhancement effect on HNBR.HNBR / PMgMA / OMT nanocomposites The composite material has good processability, physical and mechanical properties and media aging resistance. TEM results show that the combined use of MgMA / OMT contribute to the dispersion and dispersion of OMT, organic montmorillonite in the vulcanizate formed stripping and intercalation, Layer and non-intercalated microstructure. SEM showed that the interface bonding of the composites could be obviously improved when the content of MgMA / OMT was 20/10, the tensile strength, elongation at break and tearing of the nanocomposites Permanent set at 30.2 MPa, 520% and 30%, respectively. In addition, it has excellent heat-resistant air and oil aging resistance and significantly improved hot water resistance. Long-term aging at 165 ℃ in hot air, water and oil for 14 days The coefficients reach 0.61 and 0.6 respectively 3 and 0.84, respectively.Its resistance to media aging is obviously better than that of HNBR vulcanizates and HNBR / PMgMA composites.The good montmorillonite lamellar dispersion structure is the main factor to improve the media aging resistance of HNBR / PMgMA / OMT nanocomposites the reason.