Amphiphilic derivatives of carboxymethylcellulose: Evidence for intra-and intermolecular hydrophobic associations in aqueous solutions
BORSALI, Redouane
Centre de Recherches sur les Macromolécules Végétales [CERMAV]
Laboratoire de Chimie des polymères organiques [LCPO]
Centre de Recherches sur les Macromolécules Végétales [CERMAV]
Laboratoire de Chimie des polymères organiques [LCPO]
BORSALI, Redouane
Centre de Recherches sur les Macromolécules Végétales [CERMAV]
Laboratoire de Chimie des polymères organiques [LCPO]
< Leer menos
Centre de Recherches sur les Macromolécules Végétales [CERMAV]
Laboratoire de Chimie des polymères organiques [LCPO]
Idioma
en
Article de revue
Este ítem está publicado en
Polymer Engineering and Science. 2008, vol. 48, n° 10, p. 2011-2026
Wiley-Blackwell
Resumen en inglés
The intra and/or intermolecular associations of CMC-g-poly(N,N-dihexylacrylamide) copolymers in aqueous systems were studied by static (SLS) and dynamic (DLS) light scattering, viscometry, and rheology. The copolymers ...Leer más >
The intra and/or intermolecular associations of CMC-g-poly(N,N-dihexylacrylamide) copolymers in aqueous systems were studied by static (SLS) and dynamic (DLS) light scattering, viscometry, and rheology. The copolymers containing 1 to 6 mol % of hydrophobic groups were synthesized by free radical micellar copolymerization. Their associations were evaluated in different solvents (0.5 M NaCl, synthetic formation water (SFW) and Milli-Q water), as a function of the polymer concentration, hydrophobicity, temperature, and ionic strength. Rheological behavior was investigated in SWF at 55 degrees C. The results indicated that polymer-polymer interactions increase with the increase of the hydrophobic group lengths grafted onto the CMC backbone. The copolymer with the highest concentration of hydrophobic groups (6 mol %) had the lowest values of intrinsic viscosity, weight-average molar mass (M-w), and hydrodynamic radius (RH), indicating a strongly compact structure due to intramolecular hydrophobic associations. The rheological behavior of the copolymers in SFW showed that the high polymer concentration and the high temperature together with the intermolecular hydrophobic interactions and the bridges formed between divalent cations and carboxilate groups were not enough to promote a significant increase in the size of the aggregates.< Leer menos
Palabras clave en inglés
WATER-SOLUBLE POLYMERS
RHEOLOGICAL PROPERTIES
SODIUM CARBOXYMETHYLCELLULOSE
MICELLAR COPOLYMERIZATION
MODIFIED POLYACRYLAMIDES
SOLUTION BEHAVIOR
SURFACTANT
ACRYLAMIDE
AGGREGATION
CELLULOSE
Orígen
Importado de HalCentros de investigación