oups of the formula --C(O)--NH--NH2 or hydrazone groups of the formula --C(O)--NH--N???CR1,R2, wherein R is a member selected from the group consisting of a divalent alkylene group or alicyclic group having from 0 to 34 carbon atoms and a divalent aromatic ring and R1 and R2 are selected from the group consisting of H and (C1 -C6) alkyl and alicyclic groups, the amount of bis-hydrazide or bis-hydr