功能化石墨烯/弹性体协同强韧化聚丙烯纳米复合材料的制备和性能研究

Preparation and Performance of Polypropylene Nanocomposites Toughened-Reinforced Synergetically with Functionalized Graphene and Elastomer

利用乙二胺功能化石墨烯(GS-EDA)为纳米填料,马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)弹性体为增韧剂,经熔融共混法制备了PP/POE-g-MAH/GS-EDA纳米复合材料。并采用红外光谱(FTIR)、扫描电子显微镜(SEM)、示差扫描量热仪(DSC)、热失重分析(TGA)、力学性能、热变形温度和熔融指数测试分别对填料和所得纳米复合材料的结构和性能进行了测试和表征。研究表明,EDA已成功接枝于石墨烯的表面上;POE-g-MAH的酐基与GS-EDA的氨基发生了作用改善了共混体系的界面相容性并促进了GS-EDA在PP基体中的分散性。当GS-EDA含量为0.5%(质量分数)时,复合材料的拉伸强度、弹性模量和冲击强度分别较PP/POE-g-MAH提高了25.2%、32.5%和26.9%,此时复合材料的综合力学性能也最好。添加GSEDA提高了复合材料的结晶温度、熔融温度和结晶度。GS-EDA的加入使PP/POE-g-MAH/GS-EDA复合材料的热稳定性提高,而熔融指数逐渐降低。

Using ethylenediamine functionalized graphene （GS-EDA） as nano-filler and maleic anhy- dride grafted polyolefin elastomer （POE-g-MAH） as toughening agent, the PP/POE-g-MAH/GS-EDA nanocomposites were prepared by melt blending method. The morphology and properties of nano-filler and the prepared nanocomposites were characterized in detail by means of Fourier transform infrared spectroscopy （FTIR）, scanning electron microscope （SEM）, differential scanning calorimetric analysis （DSC）, thermogravimetric analysis （TGA）, mechanical properties, thermal deformation temperature and melt flow rate tests. The results indicated that EDA was successfully grafted onto GS. The reactions between the GS-EDA and POE-g-MAH could improve effectively the interfacial compatibility of blending systems and the dispersion of GS-EDA in the matrix. The tensile strength, elastic modulus and impact strength of the nanocomposites with 0.5 mass% GS-EDA increased by 25.2%, 32.5% and 26.9% respectively in comparison with those of PP/POE-g-MAH without GS-EDA. The comprehensive mechanical performance could also be acquired for the PP/POE-g-MAH/GS-EDA nanocomposite with 0.5 mass% GSEDA. The crystalline temperature, melting temperature and the degree of crystalline of the PP/POE-g-MAH/GS-EDA composites increased due to the GS-EDA incorporation. The thermal stability of all the PP/ POE-g-MAH/GS-EDA composites is improved, while the melt flow rate decreased gradually, with the addition of GS-EDA.