reduced pressure 0 002 torr at 100 u00b0 c for 24 hours the polymer yield was 6 27 g an intrinsic viscosity of 1 37 dl g was measured in methanesulfonic acid at 30 u00b0 c and at a concentration of 0 25 g dl into the bottom of a 250 ml three neck round bottom flask equipped with a mechanical stirrer thermometer and a nitrogen inlet outlet was charged with 25 g anhydrous dimethylsulfoxide dmso the solvent was stirred under nitrogen for 30 minutes after at which time 0 07 g of sodium hydride 60 dispersion in oil was added the solution was heated to 75 u00b0 c for a period of one hour during which the sodium hydride dissolved and the clear solution took a greenish tint the solution was cooled to 40 u00b0 c and 1 00 g of polymer v u03b7 1 37 d lg methanesulfonic acid 30 u00b0 c 0 25 g dl was added the suspension was stirred for 16 hours at 40 u00b0 c during which time the polymer completely dissolved and a red homogenous solution resulted the solution was cooled to room temperature and 0 1 g 2 5 mmole of allyl bromide was added the mixture was stirred under slightly positive nitrogen for 16 hours during which time the polymer solution became yellow and finally precipitated out the polymer the mixture was poured into 500 ml of water and allowed to stir until the polymer was broken into fine suspension the polymer was collected by suction filtration and extracted in a soxhlet extraction apparatus with.