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• W2066556712 abstract "Abstract Low‐charge‐density ampholytic terpolymers composed of acrylamide, sodium 3‐acrylamido‐3‐methylbutanoate (NaAMB), and (3‐acrylamidopropyl)trimethylammonium chloride were prepared via free‐radical polymerization in 0.5 M NaCl to yield terpolymers with random charge distributions. NaOOCH was used as a chain‐transfer agent during the polymerization to eliminate the effects of the monomer feed composition on the degree of polymerization (DP) and to suppress gel effects and broadening of the molecular weight distribution. The terpolymer compositions were obtained via 13 C NMR spectroscopy, and the residual counterion content was determined via elemental analysis for Na + and Cl − . The molecular weights (MWs) and polydispersity indices (PDIs) were determined via size exclusion chromatography/multi‐angle laser light scattering (SEC–MALLS); the terpolymer MWs ranged from 1.3–1.6 × 10 6 g/mol, corresponding to DPs of 1.6–1.9 × 10 4 repeat units, with all terpolymers exhibiting PDIs of less than 2.0. Intrinsic viscosities determined from SEC–MALLS data and the Flory–Fox relationship were compared to intrinsic viscosities determined via low‐shear dilute‐solution viscometry and were found to agree rather well. Data from the SEC–MALLS analysis were used to analyze the radius of gyration/molecular weight ( R g – M ) relationships and the Mark–Houwink–Sakurada intrinsic viscosity/molecular weight ([η]– M ) relationships for the terpolymers. The R g – M and [η]– M relationships revealed that most of the terpolymers exhibited little or no excluded volume effects under size exclusion chromatography conditions. Potentiometric titration of terpolymer solutions in deionized water showed that the apparent p K a value of the poly[acrylamide‐ co ‐sodium 3‐acrylamido‐3‐methylbutanoate‐ co ‐(3‐acrylamidopropyl)trimethylammonium chloride] terpolymers increased with increasing NaAMB content in the terpolymers and increasing ratios of anionic monomer to cationic monomer at a constant terpolymer charge density. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 3236–3251, 2004" @default.
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• W2066556712 date "2004-05-20" @default.
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• W2066556712 title "pH-Responsive ampholytic terpolymers of acrylamide, sodium 3-acrylamido-3-methylbutanoate, and (3-acrylamidopropyl)trimethylammonium chloride. I. Synthesis and characterization" @default.
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• W2066556712 doi "https://doi.org/10.1002/pola.20173" @default.
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