ABSTRACT
The surface tension of a solid polymer cannot be measured directly, as reversible formation of its surface is difficult. Many indirect methods have been proposed, including the liquid homolog (molecular weight dependence) method, polymer melt (temperature dependence) method, equation of state method, harmonic-mean method, geometric-mean method, critical surface tension, and others. The first four methods give remarkably consistent and reliable results, and are preferred [1]. The last two methods often give variable and low values. In this chapter, these methods are discussed. The constitutive and morphological effects on solid surface tensions are also analyzed.
