微孔发泡PP/PET/CNTs复合材料的制备及其电磁屏蔽效能研究

采用聚丙烯(PP)、聚对苯二甲酸乙二醇酯(PET)、碳纳米管(CNTs)制备了具有纤维结构的微孔发泡复合材料,借助层叠器内部流道的变化,实现了造粒阶段PET的连续化原位成纤.通过差示扫描量热仪(DSC)、扫描电子显微镜(SEM)、矢量网络分析仪和万能试验机对复合材料的结晶性能、表观形态、电磁屏蔽效能(EMI SE)和拉...

Preparation and its electromagnetic shielding performance of PP/PET/CNTs foaming composites

The microcellular foam composites with a fiber structure were prepared using polypropylene(PP),poly(ethylene terephthalate)(PET),and carbon nanotubes(CNTs)as raw materials.The in-situ formation of PET continuous fiber in the granulation stage was realized through changing the internal flow channel of the laminator.The crystalline properties,apparent morphology,electromagnetic shielding effectiveness(EMI SE),and tensile properties of the obtained composite materials were characterized using differential scanning calorimeter,scanning electron microscope,vector network analyzer,and universal testing machine.The results indicated that the composites containing 2.5 wt%PEG achieved optimal electromagnetic shielding performance,presenting the optimal in-situ fiber forming and microcellular foaming effects.This is beneficial to the construction of a conductive network based on CNTs.The microcellular foaming materials exhibited an EMI SE of 29.84 dB,and their mechanical properties were related to the fiberizing effect.The better the fiberizing effect,the stronger was the ability to bear external forces.