A method of making a copolymeric material comprising at least two repeat units of formula 1': wherein: each R 1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo; each Y is independently an alkylene, aralkylene, or a combination thereof; each G is independently a bond or a divalent residue equal to a diamine of formula R 3 HN-G-NHR 3 minus the two -NHR 3 groups; each R 3 is independently hydrogen or alkyl or R 3 taken together with G and with the nitrogen to which they are both attached form a heterocyclic group; each n is independently an integer of 0 to 300; each p is independently an integer of 1 to 25; and each q is independently an integer of 1 to 2, and the average of q is no greater than 1.05 the method comprising: (a) adding an oxalate ester of formula II to a solvent wherein: each R 2 is independently an alkyl, haloalkyl, aryl, or aryl substituted with an alkyl, alkoxy, halo, alkyoxycarbonyl, or bound through the N, wherein each R 4 is independently hydrogen, alkyl, or aryl or R 4 taken together form a ring; (b) reacting the oxalate ester with a polydiorganosiloxane diamine of formula III until essentially no polydiorganosiloxane diamine or oxalate ester remains to form the reaction product of formula IV (c) adding one or more diamines of formula V to the reaction product of formula IV to form the repeat unit of formula I' and (d) adding one or more amine-based capping agents of formula VI to halt polymerization and modify end groups of formula I' wherein R 4 is hydrogen or methyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo; G is alkyl n, alkyl-aryl (CH2-ArCH2), aryl, heteroaryl, heterocycle, or carbocycle; and R 5 is hydrogen (as part of alkyl chain or aryl group), aryl, heteroaryl, a primary amine, secondary amine, tertiary amine, amide, carbamate, or urea. each R 1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo; each Y is independently an alkylene, aralkylene, or a combination thereof; each G is independently a bond or a divalent residue equal to a diamine of formula R 3 HN-G-NHR 3 minus the two -NHR 3 groups; each R 3 is independently hydrogen or alkyl or R 3 taken together with G and with the nitrogen to which they are both attached form a heterocyclic group; each n is independently an integer of 0 to 300; each p is independently an integer of 1 to 25; and each q is independently an integer of 1 to 2, and the average of q is no greater than 1.05 the method comprising: (a) adding an oxalate ester of formula II to a solvent wherein: each R 2 is independently an alkyl, haloalkyl, aryl, or aryl substituted with an alkyl, alkoxy, halo, alkyoxycarbonyl, or bound through the N, wherein each R 4 is independently hydrogen, alkyl, or aryl or R 4 taken together form a ring; (b) reacting the oxalate ester with a polydiorganosiloxane diamine of formula III until essentially no polydiorganosiloxane diamine or oxalate ester remains to form the reaction product of formula IV (c) adding one or more diamines of formula V to the reaction product of formula IV to form the repeat unit of formula I' and (d) adding one or more amine-based capping agents of formula VI to halt polymerization and modify end groups of formula I' (a) adding an oxalate ester of formula II to a solvent wherein: each R 2 is independently an alkyl, haloalkyl, aryl, or aryl substituted with an alkyl, alkoxy, halo, alkyoxycarbonyl, or bound through the N, wherein each R 4 is independently hydrogen, alkyl, or aryl or R 4 taken together form a ring; (b) reacting the oxalate ester with a polydiorganosiloxane diamine of formula III until essentially no polydiorganosiloxane diamine or oxalate ester remains to form the reaction product of formula IV (c) adding one or more diamines of formula V to the reaction product of formula IV to form the repeat unit of formula I' and (d) adding one or more amine-based capping agents of formula VI to halt polymerization and modify end groups of formula I' wherein R 4 is hydrogen or methyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo; G is alkyl n, alkyl-aryl (CH2-ArCH2), aryl, heteroaryl, heterocycle, or carbocycle; and R 5 is hydrogen (as part of alkyl chain or aryl group), aryl, heteroaryl, a primary amine, secondary amine, tertiary amine, amide, carbamate, or urea.