Modification of Cu‐PE‐PTFE composite coatings on rubber surface by low‐energy electron beam dispersion with glow discharge

Abstract

Polytetrafluoroethylene (PTFE) composite coatings doped with copper acetate and polyethylene (PE) were fabricated on rubber substrate by electron beam dispersion technique. The effects of dopant nature and glow discharge treatment on morphology, structural and tribological properties of the coatings were investigated. The results showed that Cu and PE doping change the surface structure of PTFE-based composite coatings due to the chemical reactions between the dispersion products. Cu-PE-PTFE coatings show the columnar and layered growth models without and with discharge treatment. Cu adding decreases the crystallinity, branched degree and unsaturated degree of PE coatings, but increases the branched degree and unsaturated bonds in the PE-PTFE coatings. Glow discharge enhances the crystallinity and ordering degree of composite coatings. Friction experiments indicated the significant difference of composite coatings in the nature of their destruction during friction. PE-PTFE coating is characterized of the brittle fracture with clear failure boundaries but Cu-PE-PTFE coating shows a rough surface without cracking and delaminating after friction. Cu doping increases the dynamic coefficient of friction of PE and PE-PTFE composite coatings, but discharge plasma decreases the dynamic coefficient of friction. Cu-PE-PTFE composite coating after discharge treatment has the decreased dynamic coefficient of friction and improved wear resistance. POLYM. ENG. SCI., 58:103-111, 2018.

Influence of pore-forming agent on wear resistance of composite coating

“…As shown in Figure 2, the static contact angle of 0% PS is 86.58°, while the contact angles of the composite coatings (2% PSP, 4% PSP, 6% PSP) are very similar and significantly larger than the contact angle of 0% PS. This is due to the presence of PTFE with a small surface energy which fills the pores in composite coating [22-25].

Figure 2 Water contact angle of the coatings.

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Modification of nitrile‐butadiene rubber surface by immersion into 1,1,2‐trifluoro‐1,2,2‐trichlor‐ethane and its physio‐chemical properties

“…6 Tailoring rubber with modified properties in both the surface and the bulk is one of the most intense areas of research in elastomer chemistry. [7][8][9] The two potential approaches to modify the major rubber properties are bulk modification and surface treatment. Bulk modification of rubber is technologically attractive and relatively simple, typically achieved by adding various additives to the crude rubber before vulcanization or modifying the rubber at the latex stage.…”

“…Tailoring rubber with modified properties in both the surface and the bulk is one of the most intense areas of research in elastomer chemistry 7–9 . The two potential approaches to modify the major rubber properties are bulk modification and surface treatment.…”