amounts set forth in table 1 thf 30 ml and 3 ml of a 10 mg ml stock solution of vazo u2122 64 dissolved in thf were added to the reaction flask the reaction mixture was sparged with nitrogen gas for 30 minutes and then heated to 64 u00b0 c in an oil bath under a blanket of nitrogen for 48 hours the reaction mixture was allowed to cool and then was precipitated into cold diethylether 500 ml the copolymer was isolated by filtration and dried in a vacuum oven at 45 u00b0 c overnight the amounts for tris ma and dma for examples 2a and 2b are set forth below in table 2 into a 100 ml round bottom flask was added tris ma and dma in the amounts set forth in table 2 thf 30 ml and 3 ml of a 10 mg ml stock solution of vazo u2122 64 dissolved in thf were added to the reaction flask the reaction mixture was sparged with nitrogen gas for 0 5 hour and then heated to 64 u00b0 c in an oil bath under a blanket of nitrogen for 48 hours the reaction mixture was allowed to cool and then was precipitated into cold hexane 500 ml the copolymer was isolated by filtration and dried in a vacuum oven at 45 u00b0 c overnight the amounts for tris ma and maa for examples 3a 3d are set forth below in table 3 into a 100 ml round bottom flask was added tris ma and maa in the amounts set forth in table 3 thf 30 ml and 3 ml of a 10 mg ml stock solution of vazo u2122 64 dissolved in methanol were added to the reaction flask the reaction.