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Poly( l ‐lysine)‐ graft ‐poly(ethylene glycol): a versatile aqueous lubricant additive for tribosystems involving thermoplastics
Author(s) -
Lee Seunghwan,
Spencer Nicholas D.
Publication year - 2007
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.50
Subject(s) - aqueous solution , lubricant , ethylene glycol , polyethylene glycol , materials science , chemical engineering , peg ratio , polymer chemistry , adsorption , polyamide , cubic zirconia , chemistry , organic chemistry , composite material , ceramic , finance , engineering , economics
The adsorption and aqueous lubricating behaviour of poly( l ‐lysine)‐ graft ‐poly(ethylene glycol) (PLL‐ g ‐PEG) have been investigated for tribopairs involving thermoplastic materials, including polypropylene, polyamide‐6,6 and polyethylene. A major finding is that PLL‐ g ‐PEG adsorbs onto both hydrophobic, non‐polar surfaces and hydrophilic, polar (negatively charged) surfaces from aqueous solution, and thus plays as a very unique and effective aqueous boundary lubricant additive for the sliding contact of thermoplastics against themselves as well as against many hydrophilic, polar materials, including metals (e.g. stainless steel) or ceramics (e.g. zirconia, ZrO 2 ). Copyright © 2007 John Wiley & Sons, Ltd.