Polymer Chemistry

Fibers, Matrices and Interfaces

Heating the fiber to increase the polymer chain mobility often results in relaxation of the oriented molecules leading to degradation of fiber-axis properties. An alternative way is to use covalent, hydrogen and van der Waals interactions, or mechanical interlocking at the fiber–matrix interface. The properties of the fiber–matrix interface are of great importance for the macroscopic mechanical properties of composite materials. The two-dimensional interphases or finite-thickness interphases are considered when analyzing the interaction between fibers and matrix in composites. Polymer matrix is the continuous phase in the composites used to hold the reinforcing agent in its place, and its properties determine most of the degredative processes (delamination, impact damage, chemical resistance, water absorption, and high-temperature creep).