Formation and Behavior of Residual Stresses in Particulate-Filled Polymer Composites with a Partially Crystalline Structure
М. П. Данилаев, С.А. Карандашов, A. G. Kiyamov, М. А. Клабуков, В. А. Куклин, I. N. Sidorov, A. I. Enskaya
Abstract
Submicron-sized dispersed particles have a different effect on the mechanical characteristics of polymer composite materials with an amorphous and partially crystalline structure. For a polymer composite with a partially crystalline structure, there are at least three factors affecting the mechanical properties of the composite: restricted mobility of amorphous phase macromolecules and crystallites, change in the degree of crystallinity, and development of residual stresses in the polymer matrix. The nature of residual stresses (positive or negative) in such polymer composites affects the ultimate strength characteristics of the composite material. The paper analyzes the causes of development of residual stresses and their behavior in composites with a partially crystalline structure of the polymer matrix, using the example of fluoroplast-42 filled with modified submicron aluminum oxide particles. It is shown that residual stresses are caused by the orthotropy of mechanical properties of the polymer matrix. In the case of a radial orientation of the polymer matrix macromolecules relative to the filler particle surface, the residual stress is positive and contributes to a decrease in mechanical properties of the polymer composite.