Polymers, preparation and use thereof

A polymer comprising a moiety of Formula I:

• wherein
• A at each occurrence independently is O, NR2, or C(R3)2;
• R1 or R2 at each occurrence independently is hydrogen, alkyl, alkenyl, aryl, arylalkyl, cycloalkyl, heteroaryl, or heterocyclyl, wherein each of the alkyl, alkenyl, aryl, arylalkyl, cycloalkyl, heteroaryl, and heterocyclyl optionally is substituted with one or more suitable substituents;
• R3 at each occurrence is hydrogen, alkyl, alkenyl, aryl, arylalkyl, cycloalkyl, heteroaryl, heterocyclyl, hydroxyl, alkoxyl, aroxyl, ester, sulfide, sulfinyl, sulfonyl, halo, cyano, nitro, carbonyl, or carboxylate, wherein each of the alkyl, alkenyl, aryl, arylalkyl, cycloalkyl, heteroaryl, heterocyclyl, alkoxyl, aroxyl, ester, sulfide, sulfinyl, sulfonyl, carbonyl, and carboxylate optionally is substituted with one or more suitable substituents, or
• two R3 groups are combined to form oxo or imino;
• R4 at each occurrence is hydrogen or alkyl;
• x is 0, 1, or 2;
• and
• m and n each at each occurrence is an integer;
• or a salt thereof.