ABSTRACT
The statistical, grafted and block co-polymers have recently found extensive application in producing polymeric materials, because their properties can be modified as required by varying the reaction mixture composition. The composition of a co-polymer is specified by the initial ratio of monomers, and, in the case of their complete conversion, corresponds to the specified composition. The compositional heterogeneity of a co-polymer can be quantitatively characterized by the function of the compositional distribution of macro- molecules. One should distinguish the functions of momentary and conversion compositional distribution. Synthesis of block co-polymers is usually achieved by means of the ‘living’ polymerization technique. Chromatographic fractionation of co-polymers is based on the dependence of the adsorbability of macromolecules on their chemical composition and that of the solubility of co-polymers on their composition and molecular weight. The regularities found for oligoethers are also true for other polymeric and oligomeric systems.
