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Open AccessArticle

Preparation Nano-Structure Polytetrafluoroethylene (PTFE) Functional Film on the Cellulose Insulation Polymer and Its Effect on the Breakdown Voltage and Hydrophobicity Properties

1
The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
Postdoctoral Station of Power Engineering and Engineering Thermophysics, Chongqing University, Chongqing 400044, China
3
College of Power Engineering, Chongqing University, Chongqing 400044, China
4
College of Engineering and Technology, Southwest University, Chongqing 400715, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 851; https://doi.org/10.3390/ma11050851
Received: 21 April 2018 / Revised: 14 May 2018 / Accepted: 16 May 2018 / Published: 21 May 2018
Cellulose insulation polymer is an important component of oil-paper insulation, which is widely used in power transformer. The weight of the cellulose insulation polymer materials is as high as tens of tons in the larger converter transformer. Excellent performance of oil-paper insulation is very important for ensuring the safe operation of larger converter transformer. An effective way to improve the insulation and the physicochemical property of the oil impregnated insulation pressboard/paper is currently a popular research topic. In this paper, the polytetrafluoroethylene (PTFE) functional film was coated on the cellulose insulation pressboard by radio frequency (RF) magnetron sputtering to improve its breakdown voltage and the hydrophobicity properties. X-ray photoelectron spectroscopy (XPS) results show that the nano-structure PTFE functional film was successfully fabricated on the cellulose insulation pressboard surface. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) present that the nanoscale size PTFE particles were attached to the pressboard surface and it exists in the amorphous form. Atomic force microscopy (AFM) shows that the sputtered pressboard surface is still rough. The rough PTFE functional film and the reduction of the hydrophilic hydroxyl of the surface due to the shielding effect of PTFE improve the breakdown and the hydrophobicity properties of the cellulose insulation pressboard obviously. This paper provides an innovative way to improve the performance of the cellulose insulation polymer. View Full-Text
Keywords: cellulose insulation pressboard; magnetron sputtering; polytetrafluoroethylene; nano structure; breakdown; hydrophobicity cellulose insulation pressboard; magnetron sputtering; polytetrafluoroethylene; nano structure; breakdown; hydrophobicity
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Hao, J.; Liu, C.; Li, Y.; Liao, R.; Liao, Q.; Tang, C. Preparation Nano-Structure Polytetrafluoroethylene (PTFE) Functional Film on the Cellulose Insulation Polymer and Its Effect on the Breakdown Voltage and Hydrophobicity Properties. Materials 2018, 11, 851.

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