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

doi:10.19491/j.issn.1001-9278.2022.02.001

Abstract

Abstract:

The microcellular foam composites with a fiber structure were prepared using polypropylene （PP）， poly（ethy?lene 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 pro?perties， 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.

Key words: in?situ fibrillation, injection foaming, polypropylene, poly（ethylene terephthalate）, carbon nanotube, electroma?gnetic shielding

CLC Number:

TQ328

SONG Renda, WU Gaojian, CHEN Junxiang, ZHANG Youchen, YANG Weimin, XIE Pengcheng. Preparation and its electromagnetic shielding performance of PP/PET/CNTs foaming composites[J]. China Plastics, 2022, 36(2): 1-7.

Figures/Tables 8

Fig.1. Experimental flow chart

样品	$结晶温度 / ℃$	结晶焓/J·g^-1	$熔融温度 / ℃$	$结晶度 / %$
A1	110.83	63.28	151.50	31.21
A2	115.61	70.53	152.31	35.71
A3	115.03	66.92	154.67	34.86
A4	116.92	62.73	154.09	33.54

样品	$结晶温度 / ℃$	结晶焓/J·g^-1	$熔融温度 / ℃$	$结晶度 / %$
A1	110.83	63.28	151.50	31.21
A2	115.61	70.53	152.31	35.71
A3	115.03	66.92	154.67	34.86
A4	116.92	62.73	154.09	33.54

Tab.1. Crystallization properties of the composite materials

Fig.2. Non?isothermal crystallization curve of the composites

Fig.3. SEM images of the network of PET fibers

Fig.4. SEM images of injection?molded nanocomposites foam

Fig.5. EMI SE of non?foaming splines

Fig.6. EMI SE of microcellular foaming splines

Fig.7. Tensile properties of the composites

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