Effect of carbon nanotube modification method on properties of polyamide 11

doi:10.19491/j.issn.1001-9278.2022.02.010

Abstract

Abstract:

In this paper， two surface modification methods， acid treatment and polyethyleneimine （PEI） grafting， were employed to modify multi?walled carbon nanotubes （MWCNTs）. The resultant acid?etched MWCNTs （a?MWCNTs） and PEI?grafted MWCNTs （PEI?MWCNTs） were melt blended with polyamide 11 （PA11） to obtain the PA11/a?MWCNTs and PA11/PEI?MWCNTs composites. Their microscopic morphology， dispersibility， thermal stability， crystallinity and mechanical properties were investigated using scanning electron microscope， thermogravimetric analyzer， infrared spectrometer， and differential scanning calorimeter. The results indicated that the PA11/PEI?MWCNTs composites exhibited much better performance. When the content of PEI?MWCNTs was 3 wt%， the composites achieved tensile strength of 62.7 MPa and a Young’s modulus of 1 017 MPa， which are higher than pure PA11 by 37 % and 65 %， respectively. In addition， their degree of crystallinity increased by 14.6 %.

Key words: polyamide 11, polyethyleneimine, multi?walled carbon nanotube, composite material

CLC Number:

TQ328

LI Bo, GONG Jun, JIN Xueyi, MENG Xiaoyu. Effect of carbon nanotube modification method on properties of polyamide 11[J]. China Plastics, 2022, 36(2): 61-66.

Figures/Tables 7

Fig.1. SEM images of carbon nanotubes

Fig.2. Infrared spectra of carbon nanotubes

Fig.3. TG curves of carbon nanotubes

Fig.4. Mechanical properties of the composites

Fig.5. SEM images of the stretched section of the composites

Fig.6. DSC curves of PA11 and different composite materials

样品	熔点/℃	熔融焓/J·g^-1	结晶度/%
PA11	188.2	38.80	20.5
PA11/MWCNTs⁃0.3 %	189.6	48.26	25.5
PA11/a⁃MWCNTs⁃0.3 %	187.5	42.64	24.6
PA11/PEI⁃MWCNTs⁃0.3 %	189.4	42.37	23.5

Tab.1. Crystallization property of PA11 and different composite materials

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