Rheological Properties of Hydrophobically Associative Copolymers Prepared in a Mixed Micellar Method Based on Methacryloxyethyl-dimethyl Cetyl Ammonium Chloride as Surfmer

Table 1

Structural parameters of the copolymers.

Sample^a	Polymer composition mol %			𝑁𝐻^b	Polymer characterization
	AM	DMDCC	SDS		𝑆^c	10^−6×𝑀𝑤; g mol^−1	[𝜂]; mL g^−1	[𝜂]^dcalc; mL g^−1	Solubility in water^e
PAM	100	0	0	0	0	3.50	610	755	++
0.5DM4.5	99.5	0.5	1.75	4.5	25	3.15	586	697	++
0.5DM9.3			0.8	9.3	12.4	3.29	540	720	+
0.5DM12.7			0.5	12.7	9	3.25	520	714	+
0.5DM92			0	92	0.6	1.64	299	428	±
0.75DM4.6	99.25	0.75	5.5	4.6	25	2.22	335	536	++
0.75DM9.3			2.1	9.3	17	3.06	470	683	+
0.75DM12.8			1.35	12.8	13	3.35	418	730	+
0.75DM92			0	92	0	/	/	/	−

aThe first number indicated the mole frication of hydrophobic monomer, and the final number indicated the rounded value of 𝑁_𝐻 (e.g., 0.5DM5 stands for a polymer that contains 0.5 mol % of DMDCC with 𝑁_𝐻≈4.5). ^bNumber of hydrophobes per micelle ≈ hydrophobic block length. ^cNumber of hydrophobic blocks per chain (i.e., stickers)³⁰ calculated using the relationship 𝑆=(𝑀_𝑊/2𝑚)[𝐻]/𝑁_𝐻, where 𝑚 is the molecular weight of the monomer unit (acrylamide, 𝑚 = 71) and 𝑀_𝑊/2𝑚 corresponds to the number average degree of polymerization, N. ^dIntrinsic viscosity calculated using relationship [𝜂]=9.33×10⁻³𝑀_𝑊^0.75 established for PAM³¹. ^e++, easily soluble; +, soluble; ±, cloudy solution; −, difficult to dissolve.