Enhancing thermal conductivity and mechanical properties of poly (methyl methacrylate) via adding expanded graphite and injecting water
Enhancing thermal conductivity and mechanical properties of poly (methyl methacrylate) via adding expanded graphite and injecting water
复制标题
添加膨胀石墨和注水提高聚甲基丙烯酸甲酯的导热性能和力学性能
DOI：
10.1016/j.compositesa.2017.08.010
复制
发表时间：
2017
影响因子：
8.7
通讯作者：
Ke Dong-Ying
中科院分区：
文献类型：
--
作者：
Wu Min;Huang Han-Xiong;Tong Jun;Ke Dong-Ying
采用水助混合挤出（WAME）技术制备了聚甲基丙烯酸甲酯/膨胀石墨（PMMA/EG）复合材料。扫描电镜和透射电镜观察结果表明，注水后制备的复合样品的EG具有较好的剥落和分散性。FTIR和流变学测量结果以及实验得到的拉伸屈服应力线性拟合结果证实，在注水制备的复合材料中形成了更多的EG层网络和更强的PMMA-EG界面相互作用。具有良好剥离和分散EG层的复合样品具有较高的导热系数和力学性能，这分别归因于界面热阻较低和界面相互作用较强。最后，通过分析高压水注入与挤出机螺杆提供的剪切力的联合作用，解释了WAME过程中促进聚甲基丙烯酸甲酯在PMMA基体中剥离和分散的机理。
Poly(methyl methacrylate)/expanded graphite (PMMA/EG) composites are prepared using water-assisted mixing extrusion (WAME) technique. Scanning and transmission electron microscopy micrographs show that the EG exhibits better exfoliation and dispersion in the composite samples prepared with water injection than that in those without water injection. More EG layer networks and stronger PMMA-EG interfacial interaction are formed in the composite samples prepared with water injection, which are confirmed by the results of the FTIR and rheological measurements and the linear fits of experimentally obtained tensile yield stresses. The composite samples with well exfoliated and dispersed EG layers exhibit higher thermal conductivity and mechanical properties, which are ascribed to lower interfacial thermal resistance and stronger interfacial interaction, respectively. Finally, a mechanism for promoted EG exfoliation and dispersion in the PMMA matrix during the WAME is interpreted by analyzing the combined effect of injected high-pressure water with the shear force provided by the extruder screw.