Influence of electronic properties of naphthalene compounds on contact angles.
Contact angles of a homologous series of naphthalene compounds on films of a fluorinated acrylate polymer (EGC-1700) deviate from an ideal pattern of contact angles. The deviations increase with the electronegativity of the constituent atoms of the liquid molecules. The results suggest that an uneven distribution of electrostatic charges over the molecules creates strong dipole moments, giving rise to fairly strong dipole-dipole and dipole-induced dipole interactions between liquid molecules and the EGC-1700 chains, which have large dipole moments. In comparison, contact angles of the same probe liquids on the films of Teflon AF 1600, which have small dipole moments, fall on a smooth curve representing the surface tension of the polymer film.
Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's, College Road, Toronto, Ontario, Canada M5S 3G8.
Hossein
H
Tavana
Michael L
ML
Hair
A Wilhelm
AW
Neumann
D003198:Computer Simulation; D004583:Electrons; D008567:Membranes, Artificial; D008689:Methacrylates / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D009281:Naphthalenes / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011138:Polytetrafluoroethylene / Q000737:chemistry; D013499:Surface Properties
D008567:Membranes, Artificial; D008689:Methacrylates; D009281:Naphthalenes; D011108:Polymers; C512713:poly(2,2,3,3,4,4,4-heptafluorobutyl methacrylate); D011138:Polytetrafluoroethylene