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Investigation on Dielectric Properties of Montmorillonite Modified Polyethylene Nano-Composites

Author: LiRuPeng
Tutor: LiChangMing
School: Harbin University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Polyethylene / montmorillonite nanocomposites Electrical aging Breakdown field strength Dielectric properties
CLC: TB383.1
Type: Master's thesis
Year: 2007
Downloads: 31
Quote: 0
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Abstract


Polyethylene (LDPE) is a wide range of applications in the field of electrical insulation , plastics , nano-modified LDPE will have good scientific value and engineering significance . However , the reported polymer nanocomposites are mainly restricted to the study of polar materials of the composite material chemical and mechanical properties of the polyethylene nanocomposite technology , especially its dielectric properties was $ Not much. In this paper, melt intercalation Preparation of Polyethylene / Montmorillonite Nanocomposites test by X-ray diffraction (XRD) , scanning electron microscopy (SEM) and atomic force microscopy ( AFM ) analysis, confirmed: Add compatibilizer polyethylene / organic montmorillonite nanocomposites ( LDPE / C / O - MMT ) formed exfoliated nanocomposites . Low-density polyethylene (LDPE) sample , LDPE and montmorillonite original soil melt blending composite ( M - LDPE ) polyethylene sample and add a compatibility agent / organic montmorillonite nanocomposites materials ( LDPE / C / O - MMT ) electrical aging test , comparative study of the different samples strong EB breakdown field , dielectric loss factor tan insulation resistance -ity of the variation with the aging time , and the dielectric loss factor tan and insulation ρv of the resistivity with temperature variation . Experimental results show that : the aging before LDPE / C / O - MMT nano- composite material sample breakdown field strength higher than that of pure LDPE and the value of the M - LDPE sample EB , and electric residue breakdown field strength after aging percentages also significantly greater than the remaining value of the material sample ; LDPE / C / O - MMT sample dielectric loss factor tanδ versus temperature curve showing the typical characteristics of the polarization , and its tan value before the aging of the electric rear are significantly higher than that of pure LDPE and M - LDPE sample value , but after a electrical aging tan value increase is not obvious ; LDPE / C / O - MMT sample performance insulation resistance - temperature characteristic curve which is different from pure LDPE and conventional polymer dielectric characteristic peaks at 50 to 60 ° C. the temperature range significantly higher than LDPE and the value of the M- LDPE .

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