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Zhang W.,Ministry of Education Key Laboratory of Engineer Dielectrics and Its Application | Chen T.,Harbin University of Science and Technology | Mu J.,Wuxi Institute of Technology | Yang J.,Ministry of Education Key Laboratory of Engineer Dielectrics and Its Application | Zhao H.,Ministry of Education Key Laboratory of Engineer Dielectrics and Its Application
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

Aqueous-soluble sol with different ζ potentials was blended with ethylene vinyl acetate (EVA) in tetrahydrofuran to get masterbatch with water and solvent distilled, and then SiOx/LDPE nanomaterials were obtained by mixing LDPE with masterbatch. The effects of ζ potential of silica-sol on the size and dispersion were studied, and then mechanical and electrical properties of SiOx/LDPE nanomaterials were researched. The result shows the stability of silica-sol is closely related to the properties of SiOx/LDPE nanomaterials. Namely, as silica sol ζ potential is larger, the particle size of SiOx nanomaterials is smaller and the dispersion is more uniform. The mechanical properties of nanocomposites is better, the inhibition effect of space charge is more obvious as well, When the zeta potential is -16.80 mV, SiOx particle size is less than 100 nm, elastic modulus volume of 53.73 MPa, elongation at break of 972.41%, tensile strength of 10.13 MPa, work of fracture of 12.48 J/m2, charge injection of 2.5 C/m3~3.0 C/m3 for the composites.


Zhang W.,Harbin University of Science and Technology | Zhang W.,Ministry of Education Key Laboratory of Engineer Dielectrics and Its Application | Zhong L.,Harbin University of Science and Technology | Wu Y.,Harbin University of Science and Technology | And 5 more authors.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2014

This article compares the traditional method with the microwave-assisted method of nano-MgO preparation, and analyses the influence of Mg(OH)2 synthesized by the two methods on nano-MgO grain size and surface morphology, as well as the influence of different nano-MgO preparation methods on space charge, volume resistivity and DC breakdown field strength of the MgO/LDPE nanocomposites. The results show that the grain size of nano-MgO prepared by the traditional method is 22.74 nm, while that prepared by the microwave-assisted method is 12.76 nm. When the MgO content is 2 wt%, it can effectively reduce the space charge accumulation in the composite materials, and improve the volume resistivity and DC breakdown field strength. ©, 2014, Harbin Institute of Technology. All right reserved.


Zhang W.,Harbin University of Science and Technology | Zhang W.,Ministry of Education Key Laboratory of Engineer Dielectrics and Its Application | Wu Y.,Harbin University of Science and Technology | Yang J.,Harbin University of Science and Technology | And 6 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2013

In order to suppress space charge accumulation and improve dielectric properties of high voltage (HV) and extrahigh voltage (EHV) plastic power cable, ethylene-vinyl acetate copolymer (EVA) was added into MgO/LDPE nanocomposites. The influence of EVA type and content on the space charge, volume resistivity and direct current (DC) breakdown strength were studied. The particles dispersion in nano-composites was observed by SEM. The pictures show that the dispersion of EVA containing 14% VA in nano-composites is better than that containing 50% VA. It is also showed that the size of MgO particles is nanoscale ranging from 56 nm to 76 nm when the mass fractin of EVA (mass fraction of VA is 14%) is 9%. With the addition of EVA and nano-MgO particles, the density of space charge in nano-composites is reduced obviously, and the volume resistivity and DC breakdown strength of the nano-composites are improved.

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