1. - PRIMARY DEFINITIONS
The constitution of a polymeric substances is customarily described in terms of its structural units. These may be defined in the most general terms as group having a valence of two or more; the terminal units coming at the ends of polymer chains represent minor exceptions in that they possess a valence of only one.
Flory, P. J. Principle of Polymer Chemistry (Cornell University Press, 1971). p. 29
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