Structure of polytetrafluoroethylene powders obtained by photochemical polymerization of gaseous monomerстатья
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Дата последнего поиска статьи во внешних источниках: 4 декабря 2016 г.
Аннотация:A set of physical methods is used to study the molecular, supramolecular, and topologic structure of polytetrafluoroethylene (PTFE) powders obtained from the gaseous phase of a monomer, tetrafluoroethylene (TFE) (C2F 4), under ultraviolet irradiation in the presence of different initiators. Morphological diversity of particles forming powders is found; the effect of technological modes on the regularities of the morphological powder structure is established. The method of nuclear magnetic resonance ( 19F NMR) of broad lines allowed detecting the difference in the rotational dynamics of fragments of macromolecular chains in samples synthesized under different conditions.