: Large macromolecules consisting of repeating structural units. They serve as the "matrix" or base for more complex systems.

: Physical mixtures of two or more different polymers.

: A class of composites where at least one dimension of the filler (e.g., carbon nanotubes, nanoclays) is less than . 2. Comparative Overview

: Heterogeneous mixtures with distinct phases and multiple Tgcap T sub g

The specialized field of focuses on tailoring material properties by mixing multiple components at various scales. 1. Fundamental Definitions