Abstract
The glass transition temperature ( T g) of a series of statistical copolymers of vinylidene fluoride and trifluoroethylene has been determined experimentally. Its variation as a function of the chemical composition of the copolymers has been discussed based on the Fox, Di Marzio and Couchman equations. Using T g = −42°C for poly(vinylidene fluoride) and a value of T g usually reported for polytrifluoroethylene ( T g = 31°C, a significant discrepancy has been obtained between experimental and predicted values. Thus, it has been suggested that the glass transition temperature for polytrifluoroethylene is located in the range of −20 to −10°C, which is consistent with Wunderlich's thermal analysis data.
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