A process for purifying a P(VDF-TrFE) copolymer to produce an improved
high performance copolymer for pyroelectric conversion. Pellets of a
P(VDF-TrFE) copolymer are dissolved in a solvent to form a solution.
Subsequently, anhydrous ethanol is added to the solution to initiate
copolymer gel precipitation, after which the solution is separated to
obtain the gel precipitate, which is subsequently washed and dried. The
resulting copolymer has fewer impurities and higher resistivity, thereby
being suitable for use in applications such as pyroelectric converters.
The purified copolymer also exhibits phase transition characteristics
that allow for increased power output.