TAGGED POLYMER AND METHOD

1 . A polymer composition comprising:

a copolymer comprising—

(i) a first monomer comprising (a) a compound of formula (I), formula (I′), or formula (I″), or (b) a compound or an isomer of formula (II), wherein the first monomer is a tagging monomer, and

(ii) at least one second monomer comprising at least one polymerizable double bond or at least one polymerizable triple bond;

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , and R 28 are independently selected from the group consisting of hydrogen, hydroxyl, C 1 -C 6 alkoxy, C 2 -C 6 alkenoxy, C 2 -C 6 alkynoxy, —N(R′)(R″), C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, and C 4 -C 14 aryl,

wherein R 40 is selected from the group consisting of C 1 -C 6 alkoxy, C 2 -C 6 alkenoxy, C 2 -C 6 alkynoxy, —N(R′), —N(R′)(R″), C 2 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, and C 4 -C 14 aryl,

wherein R′ and R″ are independently selected from the group consisting of hydrogen and C 1 -C 6 alkyl, and

wherein the isomers of Formula (II) comprise a compound of Formula (IIi), a compound of Formula (IIii), a compound of Formula (IIiii), or a combination thereof—

2 . The polymer composition of claim 1 , wherein the copolymer has a weight average molecular weight (Mw) of at least 1,000,000 Da.

3 . The polymer composition of claim 1 , wherein the first monomer is present in the copolymer at an amount of about 0.01% to about 5%, by weight, based on the weight of the copolymer.

4 . The polymer composition of claim 1 , wherein the at least one second monomer comprises acrylamide, sodium acrylate, or a combination thereof.

5 . The polymer composition of claim 1 , wherein the first monomer comprises the compound of formula (I), wherein R 1 , R 2 , R 4 , R 5 , R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 are hydrogen, or formula (I′) or (I″), wherein R 1 , R 2 , R 4 , R 5 , R 7 , and R 8 are hydrogen.

6 . The polymer composition of claim 5 , wherein R 3 and R 6 are hydroxyl.

7 . The polymer composition of claim 5 , wherein R 3 and R 6 are —N(R′)(R″).

8 . The polymer composition of claim 7 , wherein R′ and R″ are independently selected from hydrogen and an unsubstituted C 1 -C 6 alkyl.

9 . The polymer composition of claim 1 , wherein the first monomer comprises the compound or isomer of formula (II), wherein R 13 , R 14 , R 15 , R 17 , R 18 , R 19 , R 20 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , and R 28 are hydrogen.

10 . The polymer composition of claim 9 , wherein R 16 and R 21 are hydroxyl.

11 . The polymer composition of claim 9 , wherein R 16 and R 21 are —N(R)(R″).

12 . The polymer composition of claim 11 , wherein R′ and R″ are independently selected from hydrogen and an unsubstituted C 1 -C 6 alkyl.

13 . The polymer composition of claim 1 , wherein the copolymer is an anionic copolymer.

14 . The polymer composition of claim 1 , wherein the first monomer is an end group of the copolymer.

15 . A method comprising:

providing a system comprising a fluid in circulation, wherein the fluid comprises the polymer composition of any one of claims 1 to 14 ;

measuring with an analytical technique an amount of the first monomer in the system or the fluid to determine an amount of the polymer composition in the system or the fluid, wherein the measuring is performed periodically or continuously; and

optionally (i) adding an additional amount of the polymer composition to the system or the fluid if the amount of the polymer composition in the system or the fluid is less than a predetermined value, or (ii) removing a portion of the polymer composition from the system or the fluid if the amount of the polymer composition in the system or the fluid is greater than the predetermined value.