利用电子束辐照法制备纳米石墨片(GnPs)-羧基丁腈橡胶(XNBR)复合材料,研究辐射剂量对胶乳共混体系稳定性的影响,并对GnPs-XNBR复合材料的交联度、热稳定性、电性能及其形貌予以表征.结果表明:辐照后GnPs-XNBR复合材料的交联度、热稳定性和体积电阻率提高,而共混乳液的稳定性显著降低.辐照强化了乳胶粒子与石墨片之间的界面结合,形成胶乳粒子包覆石墨片的核-壳结构,进而提高石墨片在基体中分散均匀性,并使GnPs-XNBR复合材料的热稳定性和介电常数提高,导电性和介电损耗降低.
The graphite nanoplatelets(GnPs)-carboxylated acrylo nitrile butadiene rubber(XNBR) composites were prepared via emulsion blending by the electron beam irradiation.The effects of the irradiation dose on the emulsion stability,crosslinking degree,thermal stability,electrical performance and the morphology of GnPs-XNBR were characterized.The results show that crosslinking degree,the thermal stability and the volume resistance rate of GnPs-XNBR increase after irradiation,while the stability of the emulsion decrease obviously.The interface interaction between the rubber particles and graphite nanoplatelets and the distribution of graphite nanoplatelets in the rubber matrix are enhanced through the core-shell structure formation attributed to the irradiation,which resulte in the increment of thermal stability and dielectric constant,and also the decrement of the conductivity and dielectric loss of the GnPs-XNBR.
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