This book explores the role of various surface phenomena in the structural and mechanical behaviour of amorphous and semicrystalline polymers, providing a useful framework for the development of new and innovative polymer-based materials. The text discusses the healing of interfacial surfaces, investigates strain softening and the phenomena taking place upon deformation of polymers in active liquid media, covers the Rehbinder effect, describes the properties of polymers in environmental or solvent crazing, details the applied aspects of surface phenomena in polymers and polymer systems, and more.