功能化石墨烯/埃洛石纳米管对聚丙烯的协同强韧化改性研究

以功能化氧化石墨烯(GO)-埃洛石纳米管(HNTs)杂化材料(GO@HNTs)为纳米填料,以聚丙烯(PP)为基体,通过熔融共混法制备了不同GO@HNTs 含量的GO@HNTs/PP纳米复合材材料,并对所得杂化填料和PP纳米复合材料的结构与性能进行系统研究。研究结果表明,功能化GO与HNTs之间存在化学相互作用,二者之间形成的“屏障效应”抑制了彼此在PP基体中的团聚。仅添加0.5%GO@HNTs杂化纳米填料后,PP复合材料的拉伸强度和冲击强度分别较纯PP提高了17.5%和80.4%,与单独添加相同含量的GO或HNTs所得复合材料的力学性能相比,GO@HNTs杂化纳米填料对PP基体具有明显的协同增强增韧改性作用。与纯PP相比,GO@HNTs/PP试样表现出更高的储能模量、损耗模量和玻璃化转变峰值。由于GO@HNTs的“异相成核效应”和“物理热阻效应”,有效提高了PP纳米复合材料的结晶温度、熔融温度、结晶度和耐热分解温度。

Synergistic Strengthening-Toughening Modification of Polypropylene with Functional Graphene/Halloysite Nanotubes

Nanocomposites of GO@HNTs/PP were prepared through melt blending method with polypropylene (PP) as matrix and hybrid nanofillers (GO@HNTs) composed of functionalized graphene oxide (GO) and halloysite nanotubes (HNTs) as filler. The structures and properties of the prepared hybrid nanofillers and PP nanocomposites were systematically investigated. Results show that there is chemical interactions between functionalized GO and HNTs, resulting in formation a "barrier effect" between them and inhibit the aggregation of the two species in the PP matrix. The tensile strength and impact strength of PP nanocomposites with 0.5% GO@HNTs hybrid nano-filler increased by 17.5% and 80.4%, respectively, compared with those of pure PP. Compared with the mechanical properties of composites prepared by adding the same content GO or HNTs alone, GO@HNTs hybrid nano-filler had obvious synergistic strengthening-toughening effect on the PP matrix. GO@HNTs/PP exhibited higher storage modulus, loss modulus and glass transitional temperatures than those of pure PP. The crystallization temperature, melting temperature, crystallinity and thermal decomposition temperature of PP nanocomposites are effectively increased due to the “heterogeneous nucleation effect” and “physical insulation effect” of GO@HNTs.