ABSTRACT
The physical behavior of a polymer depends not only on the general chemical composition but also on the more subtle differences in microstructure. As it is now possible to exercise a larger degree of control over the synthesis of specific structures, it is prudent at this point to elaborate on the types of microstructural variations encountered before discussing how each can be produced. Several kinds of isomerism or microstructural variations can be identified, and these are grouped under four main headings: architectural, orientational, configurational, and geometric.
