Mobility of the Spin Probe TEMPO in Glassy Metathesis Polymers with Substituents Containing Flexible Si–O–Si Groupsстатья
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Дата последнего поиска статьи во внешних источниках: 30 апреля 2017 г.
Аннотация:Glassy metathesis polymers (glass transition temperatures of 110–236°C) containing substituents
with flexible Si–O–Si groups are studied by the spinprobe method with the use of the stable nitroxyl radical TEMPO. A high mobility of the spin probe not correlating with the free volume of polymers is reported. These results and the earlier discovered thermodynamic selectivity of the indicated polymers (high permeability coefficients of higher hydrocarbons) make it possible to infer that Si–O–Si groups are responsible for the observed behavior similarly to that in siloxane rubbers.