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Oligomeric fluorinated additives as surface modifiers for solid polymers
Author(s) -
Berneit Marianne K.
Publication year - 1977
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760170706
Subject(s) - materials science , polymer , wetting , polystyrene , adsorption , substrate (aquarium) , chemical engineering , surface energy , surface tension , polymer chemistry , adhesion , copolymer , diffusion , polymer substrate , composite material , organic chemistry , chemistry , oceanography , physics , quantum mechanics , engineering , thermodynamics , geology
Successful modification of the surface properties of solid polymers was obtained by the adsorption of appropriate partially fluorinated oligomers at polymer/air and polymer/substrate inter faces during the formation of these interfaces. These additives, in concentrations of 0.25 percent, effectively lowered the critical surface tension of wetting, γ c , of such polymers as polystyrene, poly(methylmethacrylate), and poly(vinylidene chloride) copolymers by as much as 26 dyn/cm. The obtained low γ c values of 14 dyn/cm correspond to surfaces containing closely packed CF 3 and CF 2 groups. Adhesion of additive‐containing polymer films to various substrates was demonstrated to be a function of additive diffusion to the polymer/substrate interface, its subsequent adsorption and molecular orientation at that interface, and the surface energy of the substrate. The fluorinated additive molecules also have the advantage of being sufficiently mobile in the solidified polymer to reach and repair the interfaces.