overhead stirrer ika work inc wilmington n c at room temperature the hexane supernatant was separated by centrifugation at 3 500 g for 20 minutes and the solid pellet recovered after decanting the hexane supernatant the pellet was subsequently extracted using 425 g of mibk aldrich chemical co inc milwaukee wis at room temperature with overhead stirring ika u00ae werke eurostar power control visc overhead stirrer ika work inc wilmington n c for 3 hours the supernatant solution of polymer in mibk was separated by centrifugation at 3 500 g for 20 minutes and the polymer precipitated by addition of 355 g of hexane the precipitated polymer was recovered by filtration using a funnel lined with fluted filter paper vwr scientific products west chester pa and dried overnight at 45 u00b0 c under vacuum of 1 mm hg under vacuum in a buichi rotavap to yield 13 gram of dried polymer the dried polymer was subjected to hot film pressing at 180 u00b0 c a suitable amount of pha typically 0 5 gram is placed between two pet sheets separated by shims to form a film of 100 micron thickness the film assembly i e two sheets shims and pha was placed between the heated 180 u00b0 c blocks of the press carver hydraulic press model 3912 carver inc wabash ind and a load of 10 tons was applied for 30 seconds the film was then cooled between aluminum blocks and then inspected for color and clarity this yielded a substantially clear film with substantially no fuming or objectionable odors at the operating temperature of 180 u00b0 c during.