a process for purifying a p copolymer to produce an improved high performance copolymer for pyroelectric conversion . pellets of a p 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 .