氧化镍负载纳米石墨微片/聚乙烯的热稳定性

Thermal Stability of Nickel Oxide Supported Graphite Nanosheet/Polyethylene Nanocomposites

将膨胀石墨(EDG)经酸化与超声波处理制备纳米石墨微片(GN),采用溶胶-凝胶法在GN悬浮液中制备氧化镍(NiO)负载纳米微片(NiO/GN),用溶液法将NiO/GN加入聚乙烯(PE)中制备纳米复合材料.以X-射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)为表征手段研究了GN和NiO/GN的结构和形貌,并采用热重分析(TG)评价了纳米复合材料的热稳定性.研究结果表明,经酸化和超声波处理所制备的GN仍具有良好的片层结构,片层厚度大幅度降低,经负载后NiO均匀分散在纳米微片上,与PE相比,纳米石墨微片的加入提高了PE/GN的热稳定性,而PE/NiO/GN的热稳定性显著降低.

Graphite nanosheet （GN） was prepared by treating expanded graphite （EG） with acid and ultrasonic. Nickel oxide （NiO） was loaded on the surface of GN by sol-gel method in the suspension of GN. NiO supported GN （NiO/GN） was added to polyethylene （PE） to obtain nanocomposites by solution mixing. The structure and morphology of GN and NiO/GN were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） while the thermal stabilities of PE based nanocomposites were evaluated by thermogravimetric analysis （TG）. The results proved the well layered structure of GN with very thin layers of nano-size. NiO was found homogeneously dispersed on the surface of GN. PE/GN nanocomposites showed the similar thermal degradation behaviors with PE while the thermal stability of PE/NiO/GN nanocomposites was obviously impaired.