Mean activity coefficient of polyelectrolytes. XI. Activity coefficients of various salts of polyacrylic acid and carboxymethylcellulose

Asai, Kiyotsugu; Takaya, Katsuhiko; Ise, Norio

doi:10.1021/j100846a007

Cited by 17 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such findings are in agreement with the studies of PA protonation equilibrium in the presence of alkali metal and alkylammonium salts. 57 The osmotic coefficient investigations of alkali metal poly(acrylates) 60 also suggest the highest affinity of the polyanion toward Na + . Interestingly, quite similar osmotic coefficients of potassium and lithium PA were obtained, 60 whereas the herein reported aggregation experiments suggest stronger binding of smaller Li + cation.…”

Section: Macromoleculesmentioning

confidence: 99%

“…57 The osmotic coefficient investigations of alkali metal poly(acrylates) 60 also suggest the highest affinity of the polyanion toward Na + . Interestingly, quite similar osmotic coefficients of potassium and lithium PA were obtained, 60 whereas the herein reported aggregation experiments suggest stronger binding of smaller Li + cation. The more recent investigations of polyelectrolyte gel collapse in mixed solvents (water containing alcohols, DMSO, acetone, THF) 61,62 are also in accord with osmometric results.…”

Section: Macromoleculesmentioning

confidence: 99%

See 1 more Smart Citation

Conditions Leading to Polyelectrolyte Complex Overcharging in Solution: Complexation of Poly(acrylate) Anion with Poly(allylammonium) Cation

et al. 2016

View full text Add to dashboard Cite

Complexation between poly(acrylate) (PA) and poly(allylammonium) (PAH) macroions at pH = 7.0 was studied by means of electrokinetics, microcalorimetry, and DLS. At low polyelectrolyte concentrations and no electrolyte present strong overcharging of primary nanocomplexes occurred. In contrast, the increase in polyelectrolyte concentration led to flocculation taking place near the equivalence. The nanocomplex charge reversal was also achieved in the high polymer concentration regime by the abrupt instead of stepwise titrant addition. The procedure was successfully used in the case of several other polyion pairs. The presence of electrolyte affected the PAH–PA interpolyelectrolyte neutralization considerably, leading to ion-specific aggregation and extrinsic charge compensation. The complexation energetics was weakly influenced by ionic conditions. To the best of our knowledge, the reported results are the first direct evidence for primary complex overcharging. Their rationalization explains why interpolyelectrolyte neutralization in solution and at surfaces usually results in formation of neutral and charged products, respectively.

show abstract

Section: Macromoleculesmentioning

confidence: 99%

Section: Macromoleculesmentioning

confidence: 99%

Conditions Leading to Polyelectrolyte Complex Overcharging in Solution: Complexation of Poly(acrylate) Anion with Poly(allylammonium) Cation

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In aqueous systems, due to the strong hydration energies (or difficulty of dehydration) of ions, ion‐specificity for the counterion binding is not so marked, though well appreciable 4–6. For example, in the case of polyelectrolytes having carboxyl group such as poly(acrylic acid) (PAA), the binding degree for the alkali metal cations is higher for the smaller counterions than the larger ones; Li + > Na + > K + > Cs + 7, 8. The very inverse is the case for polymers with sulfate or sulfonate groups 9, 10.…”

Section: Introductionmentioning

confidence: 99%

Counterion mixing effects on the conformational transitions of polyelectrolytes. I. Volume phase transition and coil‐globule transition of alkali metal poly(acrylate)s

Hayashi

Wakagawa

Minato

et al. 2009

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Counterion mixing effects on the volume phase transition and the coilglobule transition of alkali metal poly(acrylate)s (PAAM) in aqueous organic solvents were investigated by observing the swelling behavior of PAAM gel and by measuring the solution viscosity and the conductivity as a function of the counterion mixing ratio. Marked transitions to the collapsed states were induced only for Li þ /Cs þ system in most solvent systems; namely, PAA gel significantly collapsed in the presence of Li þ and Cs þ counterions irrespective of the solvent species employed, while only a slight deswelling was observed for Li þ /K þ system in some aqueous organic solvents. Corresponding specific decrements in the solution viscosity and conductivity were also confirmed for the combination of Li þ and Cs þ in aqueous dimethyl sulfoxide (DMSO) system. A simple analysis of the conductivity decrement observed for Li þ / Cs þ system in 60 vol % DMSO suggested that only Cs þ is tightly bound upon addition of Li þ while no restriction is induced for Li þ upon mixing with Cs þ . A working hypothesis is proposed for the apparently intriguing behaviors of the counterions in the mixed system.

show abstract

“…The values for R h T and R g T corresponding to an ionic strength of 1!10 K2 mol/l and 18 8C (q-temperature) were calculated using the relation a 2 h Z R 2 h =R 2 h q [16] and R h /R g Z 0.6 at low salt concentration [13], where a 2 h is an expansion factor calculated according to empirical relation [17]:…”

Section: Resultsmentioning

confidence: 99%

Ultrafine nano-colloid of polyaniline

Dorey

Vasilev

Vidal

et al. 2005

Polymer

View full text Add to dashboard Cite

Mean activity coefficient of polyelectrolytes. XI. Activity coefficients of various salts of polyacrylic acid and carboxymethylcellulose

Cited by 17 publications

References 1 publication

Conditions Leading to Polyelectrolyte Complex Overcharging in Solution: Complexation of Poly(acrylate) Anion with Poly(allylammonium) Cation

Conditions Leading to Polyelectrolyte Complex Overcharging in Solution: Complexation of Poly(acrylate) Anion with Poly(allylammonium) Cation

Counterion mixing effects on the conformational transitions of polyelectrolytes. I. Volume phase transition and coil‐globule transition of alkali metal poly(acrylate)s

Ultrafine nano-colloid of polyaniline

Contact Info

Product

Resources

About