abstract |
A polymeric reagent having a structure of ** Formula ** wherein: POLI1 is a poly (alkylene oxide); POLI2 is a poly (alkylene oxide); (a) is 0, 1, 2 or 3; (b) is 0, 1, 2 or 3; (e) is 0, 1, 2 or 3; (f) is 0, 1, 2 or 3; (g ') is 0, 1, 2 or 3; (h) is 0, 1, 2 or 3; (j) is from 0 to 20; each R1 is independently H or an organic radical selected from the group consisting of alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl and substituted aryl; X1, when present, is a first spacer moiety; X2, when present, is a second spacer moiety; X5, when present, is a fifth spacer remainder; X6, when present, is a sixth spacer remainder; X7, when present, is a seventh spacer remainder; X8, when present, is an eighth spacer residue; R5 is a branched radical; and Z is a reactive group. |