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The effect of grafted polymeric lubricant molecular weight on the frictional characteristics of nylon 6,6 fibers
Author(s) -
Michielsen Stephen
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990705)73:1<129::aid-app15>3.0.co;2-z
Subject(s) - lubricant , radius of gyration , materials science , grafting , polymer chemistry , composite material , adhesion , radius , synthetic fiber , polymer science , polymer , fiber , computer security , computer science
Boundary friction between two crossed nylon 6,6 fibers has been reduced up to 6× by grafting polymeric lubricants to the surface. A modified adhesion model of friction, accommodating multiple materials on the surface, explains the variation in the friction coefficient with the molecular weight of the lubricant. The friction coefficient is proportional to the fraction of the surface covered by the grafted chain, represented by π R 2 G / A , where A is the surface area per graft site, and R G is the radius of gyration of the lubricant. It is also shown that for larger the grafted chains, the appropriate surface area fraction depends on π R 2 G /3 A . It is argued that if R G of the grafted lubricant is larger than half the distance between graft sites, the next nearest graft site is used due to steric blocking of the nearest graft site. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 129–136, 1999