Study of polyether thermoelastoplasts by the 1H and 13C NMR method

The degree of polycondensation and the nature of the end groups in a series of polyalkyleneoxylglycols (polyethylene, polytetramethylene and polypropyleneoxyglycols and also the copolymer of propyleneoxyglycol and tetrahydrofuran), used for synthesis of polyether elastoplasts (PETEP), have been determined by 13C NMR. For polyether thermoelastoplasts based on 1,4-butanediol, dimethyl terephthalate and polyalkyleneoxyglycols, an analysis of the composition was made. For PETEP based on ethylene glycol, dimethyl terephthate and polyalkyleneoxyglycols, both composition and chain structure was determined. It was shown that degradation of polyalkyleneoxyglycol does not occur in the synthesis of PETEP. The content of the components in PETEPS coincides with the composition of the original mixture and the monomer units were shown to be randomly distributed in them.