Evaluation of the dielectric properties of grease containing copolymers and ester

• Published in: Journal of applied polymer science 2012-07, Vol.125 (2), p.1439-1447
• Main Authors: Hassan, Amaly M., Youssif, Mona A., Mazrouaa, Azza M., Abou Shahba, Rehab M., Youssif, Maha A. E.
• Format: Article
• Language: English
• Subjects: Anhydrides; Applied sciences; Atacticity; Blends; Copolymers; copolymers and ester grease; Corrosion prevention; dielectric grease; Esters; Exact sciences and technology; Forms of application and semi-finished materials; Greases; Materials science; Polymer industry, paints, wood; Polymers; Polypropylenes; Stearates; Technology of polymers; wax gel grease
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.35619

Poly(1‐octadecene‐co‐maleic anhydride) bis behanate ester, poly(1‐octadecene‐co‐maleic anhydride) bis stearate ester, and ethylene glycol bis stearate ester were prepared and their structures were confirmed by IR spectroscopy. Wax gel was prepared from base oil blend (base lube oil grade 260/290, transformer oil) and microcrystalline wax in ratio 2.3 : 1, respectively, in the presence of antioxidant and anticorrosion additives in ratio of 0.1–2%. Atactic polypropylene was added in mixture with the above copolymers and ester to the wax gel in different proportions. Dielectric constant, dielectric loss, and volume resistivity at frequency range of 1–103 kHz 35°C have shown better results than that of wax gel alone. The grease which includes poly(1‐octadecene‐co‐maleic anhydride) bis behanate ester in mixture with atactic polypropylene recorded the best results. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012