- Volume 22 Issue 2
Relationships between surface tension and solubility parameter and between critical surface tension and dispersion component of solubility parameter of polymers were determined by using a modified Hildebrand-Scott equation, in which relation factors are fixed as 2.04 and 1.85, respectively. Poly(ethylene) (PE), non-polar, nylon 6, strongly polar, and PET, weakly polar, were used as model polymers. The polymer films having different crystallinity were prepared by annealing, and their surface tension, including dispersion and polar components were determined from the contact angle data by Kaelble method. The solubility parameter components of the polymer films were calculated from the modified Hildebrand-Scott equation. In addition the effect of crystallinity on the solubility parameter was examined in relation to the crystal structural and conformational changes of the polymer films.