results are shown in table iii as follows it is apparent that by adding vbc to the mixes of vinyl pyridine dvb or dmaema dvb or dmapma dvb the mixes were homogenous thus no solvent was needed for the polymerization upon polymerization the vbc also reacts with a portion of the tertiary amine resulting in a membrane with both quaternary and tertiary amines with an attendant high cross linking degree the a 3 membranes tested as shown in table iii exhibited a very high 93 and higher acid current efficacy by adding the vbc to react with a portion of the tertiary amine in the monomers such as vinyl pyridine dmaema dmapma etc we can control the ratio of quaternary and tertiary amines in the resulting membrane and can also increase membrane cross linking a high current efficiency can be obtained from aliphatic monomers such as dmaema dmapma etc due to the resulting high crosslink degree and low water content of the membranes resistance is also decreased due to the introduction of quaternary amines in the membrane in one preferred aspect of the invention the anion block anion selective membrane is a polymerization reaction product of i dmaemc ii dvb and iii vbc the molar ratio of i ii iii may be on the order of 20 60 30 70 1.