Effect of PE⁃g⁃MAH on Properties of Polyamide 6/Conductive Carbon Black Composites

doi:10.19491/j.issn.1001-9278.2021.03.007

Abstract

Abstract:

Maleic anhydride-grafted polyethylene （PE-g-MAH） was used to simultaneously improve the antistatic properties and toughness of polyamide 6 （PA6）/carbon black （CB） composite. A series of PA6/CB， PA6/PE?g?MAH and PA6/PE-g-MAH/CB composites were prepared by melting extrusion and injection molding. Their morphologies and crystallization properties were investigated by using scanning electron microscopy and differential scanning calorimetry， and their mechanical and electrical properties were examined. The results indicated that the toughness of PA6 decreased significantly with the addition of 7.5 wt% CB. CB can generate heterogeneous nucleation on the crystallization of PA6. There is good miscibility between PE-g-MAH and PA6， resulting in a fine dispersion of PE-g-MAH in the PA6/CB matrix or PA6. The addition of PE-g-MAH improved the dispersion of CB particles and changed the selective location of CB in the PA6 matrix， leading to an increase in the electric conductivity of PA6/PE-g-MAH/CB ternary composites. PE-g-MAH can effectively improve the impact strength and elongation at break of pure PA6 and PA6/CB composite. A low content of PE-g-MAH can enhance the crystal formation of PA6 in the composites.

Key words: polyamide 6, maleic anhydride-grafted polyethylene, conductive carbon black, morphology, electrical conductivity

CLC Number:

TQ323.6

LI Yin, ZHOU Song, LU Chaofei, LUO Yumei, BAI Xiaodong. Effect of PE⁃g⁃MAH on Properties of Polyamide 6/Conductive Carbon Black Composites[J]. China Plastics, 2021, 35(3): 44-49.

Figures/Tables 7

References 18

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样品编号	PA6/%	PE?g?MAH/%	CB/%
1^#	100	0	0
2^#	95	5	0
3^#	90	10	0
4^#	85	15	0
5^#	80	20	0
6^#	70	30	0
7^#	92.5	0	7.5
8^#	87.5	5	7.5
9^#	82.5	10	7.5
10^#	77.5	15	7.5
11^#	72.5	20	7.5
12^#	62.5	30	7.5

样品编号	PA6/%	PE?g?MAH/%	CB/%
1^#	100	0	0
2^#	95	5	0
3^#	90	10	0
4^#	85	15	0
5^#	80	20	0
6^#	70	30	0
7^#	92.5	0	7.5
8^#	87.5	5	7.5
9^#	82.5	10	7.5
10^#	77.5	15	7.5
11^#	72.5	20	7.5
12^#	62.5	30	7.5

样品编号	PE?g? MAH/%	CB/ %	拉伸强度/MPa	拉伸模量/MPa	断裂伸长率/%	冲击强度/ kJ·m^-2
1^#	0	0	63.27	631.17	54.36	13.07
2^#	5	0	50.59	407.62	121.70	16.72
3^#	10	0	44.75	365.03	137.23	20.09
4^#	15	0	42.85	355.95	164.35	20.49
5^#	20	0	34.49	348.39	191.34	26.89
6^#	30	0	33.06	321.95	203.03	36.08
7^#	0	7.5	47.26	769.50	7.25	7.15
8^#	5	7.5	47.39	496.96	22.49	7.83
9^#	10	7.5	43.88	445.06	34.61	9.40
10^#	15	7.5	39.93	433.96	35.39	9.94
11^#	20	7.5	38.76	424.75	36.53	11.13
12^#	30	7.5	32.06	392.52	29.20	13.03

样品编号	PE?g? MAH/%	CB/ %	拉伸强度/MPa	拉伸模量/MPa	断裂伸长率/%	冲击强度/ kJ·m^-2
1^#	0	0	63.27	631.17	54.36	13.07
2^#	5	0	50.59	407.62	121.70	16.72
3^#	10	0	44.75	365.03	137.23	20.09
4^#	15	0	42.85	355.95	164.35	20.49
5^#	20	0	34.49	348.39	191.34	26.89
6^#	30	0	33.06	321.95	203.03	36.08
7^#	0	7.5	47.26	769.50	7.25	7.15
8^#	5	7.5	47.39	496.96	22.49	7.83
9^#	10	7.5	43.88	445.06	34.61	9.40
10^#	15	7.5	39.93	433.96	35.39	9.94
11^#	20	7.5	38.76	424.75	36.53	11.13
12^#	30	7.5	32.06	392.52	29.20	13.03

CB含量/%	表面电阻/Ω	体积电阻率/Ω?cm
0	1.62×10¹²	1.64×10¹³
2.5	7.07×10¹¹	5.65×10¹²
5.0	1.35×10¹¹	1.76×10¹²
7.5	3.43×10⁹	7.10×10⁹
10.0	2.60×10⁵	1.16×10⁶