Study on the Mechanical and Electrical Properties of Polypropylene-based Insulating Materials by Mixing Process

doi:10.11985/2021.02.005

Abstract

Abstract:

Use polypropylene(PP) as the matrix, ethylene-octene copolymer(POE) elastomer and styrene-ethylene/butylene-styrene triblock copolymer(SEBS) as fillers, the elastomer/polypropylene composite is prepared by two mixing methods of twin screw extruder and torque rheometer. Studies show that the mechanical toughness of elastomer/polypropylene composites is improved compared to pure PP, but the electrical strength of the material reduces, and the accumulation of space charges increases. Among them, SEBS/PP composites have the best mechanical toughness and the highest electrical strength. The shear stress of the twin screw is stronger, so the material elastomer prepared by its mixing is more uniform, the crystallinity increases, and the electric strength increases. But at the same time, stronger shear stress will also degrade PP macromolecular chains, leading to increased space charge accumulation.

Key words: Polypropylene, elastomer, blending process, mechanical properties, electrical properties

CLC Number:

TM85

YANG Jun, YANG Jiaming, ZHAO Xindong, YANG Xu, WANG Xuan. Study on the Mechanical and Electrical Properties of Polypropylene-based Insulating Materials by Mixing Process[J]. Journal of Electrical Engineering, 2021, 16(2): 33-41.

Figures/Tables 13

References 14

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试样编号	熔融温度T_c/℃	结晶温度T_m/℃	结晶度X_c(%)
PP流变仪	118.2	169.8	37.40
30POE/PP流变仪	117.3	167.6	26.82
30SEBS/PP流变仪	119.5	169.0	27.60
PP双螺杆	118.1	169.2	40.91
30POE/PP双螺杆	117.2	168.3	27.14
30SEBS/PP双螺杆	119.6	168.1	28.21

试样编号	断裂伸长率(%)	拉伸断裂应力/ MPa	拉伸屈服应力/MPa
PP流变仪	579.1	29.2	21.7
30POE/PP流变仪	482.5	19.1	14.1
30SEBS/PP流变仪	528.3	26.9	12.4
PP双螺杆	513.4	27.0	24.2
30POE/PP双螺杆	499.0	20.2	14.3
30SEBS/PP双螺杆	518.8	26.0	12.1

试样编号	重量/(g/10 min)
PP流变仪	1.9
30POE/PP流变仪	1.7
30SEBS/PP流变仪	1.8
PP双螺杆	1.8
30POE/PP双螺杆	1.6
30SEBS/PP双螺杆	1.5

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