Evaluation of the dielectric properties of grease containing copolymers and ester

• Published in: Journal of applied polymer science Vol. 125; no. 2; pp. 1439 - 1447
• Main Authors: Hassan, Amaly M., Youssif, Mona A., Mazrouaa, Azza M., Abou Shahba, Rehab M., Youssif, Maha A. E.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.07.2012; Wiley; Wiley Subscription Services, Inc
• 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; Lubricating oil; Dielectric loss; Polymer blends; Olefin copolymer; Dielectric properties; Propylene polymer; dielectric grease; Antioxidant; Experimental study; copolymers and ester grease; Property formulation relationship; Wax; Lubricating grease; Additive; Stabilizer agent; wax gel grease; Maleic anhydride copolymer; Olefin polymer; Permittivity; Atactic polymer; Apparent viscosity; Rheological properties
• 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