Water-soluble copolymers. XLV. Ampholytic terpolymers of acrylamide with sodium 3-acrylamide-3-methylbutanoate and 2-acrylamido-2-methylpropanetrimethylammonium chloride

Journal Article · Mon May 10 04:00:00 EDT 1993 · Journal of Applied Polymer Science; (United States)

DOI:https://doi.org/10.1002/app.1993.070480617· OSTI ID:6482709

McCormick, C L; Salazar, L C ^[1]

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1. Univ. of Southern Mississippi, Hattiesburg (United States)

Water-soluble, low charge density polyampholytes have been synthesized by free-radical terpolymerization of acrylamide (AM) with sodium 3-acrylamide-3-methylbutanoate (NaAMB) and 2-acrylamido-2-methylpropanetrimethylammonium chloride (AMPTAC). Terpolymer compositions obtained by [sup 13]C0NMR reflect monomer feed concentrations. Molecular weights and second virial coefficients range from 3.43 to 19.4 [times] 10[sup 6] g/mol and from 1.63 to 3.61 mL mol/g[sup [minus]2], respectively, as determined by low-angle laser light scattering. Ionic associations were explored by investigating the dilute solution properties as a function of terpolymer concentration, terpolymer charge density, and added electrolytes. Terpolymers with 0.5, 2.5, and 5.0 mol% of both of the cationic (AMTAC) and anionic (NaAMB) monomers were soluble in deionized water, whereas those with 10 and 15 mol% of each monomer required electrolyte addition. The higher-density terpolymers undergo a 700% increase in intrinsic viscosity upon changing NaCl concentration from 0.05 to 1M. Polyelectrolyte behavior could be induced by decreasing solution pH below the pK[sub a] of the NaAMB mer. Intermolecular ionic associations resulting in gel networks were studied utilizing dynamic mechanical analysis.

• OSTI ID: 6482709
• Journal Information: Journal of Applied Polymer Science; (United States), Journal Name: Journal of Applied Polymer Science; (United States) Vol. 48:6; ISSN 0021-8995; ISSN JAPNAB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACRYLAMIDE
AMIDES
CARBON 13
CARBON ISOTOPES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPOLYMERIZATION
COPOLYMERS
ELECTROLYTES
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
MOLECULAR WEIGHT
NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERIZATION
POLYMERS
SOLUBILITY
STABLE ISOTOPES
SYNTHESIS