Nt. Correia et al., ESTIMATION OF THE SURFACE-TENSION OF A SOLID - APPLICATION TO A LIQUID-CRYSTALLINE POLYMER, Journal of colloid and interface science, 189(2), 1997, pp. 361-369
The different methods available in the literature to calculate the sur
face tension of a solid from contact angle measurements are discussed
and compared. The discussion is based on the contact angles of water,
glycerol, and diiodomethane measured at 20 degrees C on the surface of
a side-chain liquid crystalline polymer, Some discrepancies exist amo
ng the results obtained with the different methods, mainly between the
values yielded by Neumann's equation and those obtained with approach
es that postulate the decomposition of the surface tension into severa
l terms associated with different types of molecular interactions (met
hods of Owens and Wendt and of Good and van Oss). The physicochemical
basis of these various treatments is discussed. (C) 1997 Academic Pres
s.