SECTION 4.9 – Plasticity of Polymers

摘要: This chapter deals with the explanation of plasticity polymers. In crystalline materials, is interpreted in terms motion linear defects or dislocations. Plasticity polymers refers to large deformations amorphous a temperature range below and near glass transition temperature, semicrystalline their melting temperature. Semicrystalline are very often deformed when phase rubberlike state. mobility component allows, at beginning deformation, relative displacements lamellae. Then, plastic deformation polymer crystals takes place, essentially by crystallographic slip. At strains, lamellar broken into smaller blocks connected fragments molecules. lamellar-to-microfibrillar transformation occurs macroscopic neck. The ultimate step extension network. Consequently, can be modeled using micromacro approaches based on slip mechanisms, whereas strain-hardening high strain treated rubber elasticity formalism. When glassy state, combines specific mechanisms phases.