By J. D. Andrade (auth.), J. D. Andrade (eds.)
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The temperature dependence of contact angles of PTFE (relatively high crystallinity) and n-decane, as calculated from the data of capillary rise. (From ref. 24) 2-2 TEMPERATURE DEPENDENCE OF CONTACT ANGLE OF POLY(2-HYDROXYETHYL METHACRYLATE) AND RELATED COPOLYMERS. In general, the contact angle measurement is performed by placing a pure liquid droplet on a solid surface. To ensure the hydration of the polymer surface, a water-liquid-solid system is chosen as an experimental system. The interfacial surface tension between two phases(i,j) can be approximated by 27-29J (5) 29 t- <1 20 40 60 80 100 120 140 T (oC) Fig.
13) Polymer molecules have much greater freedom for rearrangement in the bulk or at a surface; therefore, they may orient themselves differently at the surface and in the bulk. Thus, the polymer surface has a large mobility and is deformable. Because of mobility of polymer surfaces, it is interesting to study the temperature dependence of polymer surface properties. Whereas there exists a large amount of isothermal contact angle data, mostly obtained at room temperature, only rather small numbers of studies of the temperature dependence of contact angles has been carried out.
For "this displacement, the ratio dA 12/dA 23 depends on the sharpness of the edge and the diameter of the capillary and is always greater than cos8, which remains equal to zero during the process. Since Eq. (10) is not generally valid, Eq. (7) can't be correct. Several experiments prove that the equilibrium postulated in Eq. (7) does not exist. For example, a bar of 10% gelatin gel was partly immersed in a large mercury drop. 004cm. An approximate calculation predicts that the height of the ridge is of atomic dimensions whenever the modulus of elasticity of the solid is above about 10 8 dyn/cm2.