Comportamento dinâmico-mecânico e relaxações em polímeros e blendas poliméricas

Abstract

DYNAMIC MECHANICAL BEHAVIOR AND RELAXATIONS IN POLYMERS AND POLYMERIC BLENDS. Dynamic mechanical analysis (DMA) is widely used in materials characterization. In this work, we briefly introduce the main concepts related to this technique such as, linear and non-linear viscoelasticity, relaxation time, response of material when it is submitted to a sinusoidal or other periodic stress. Moreover, the main applications of this technique in polymers and polymer blends are also presented. The discussion includes: phase behavior, crystallization; spectrum of relaxation as a function of frequency or temperature; correlation between the material damping and its acoustic and mechanical properties.