Further investigation of the osmotic properties of hydrogen and sodium polystyrenesulfonates

Reddy, Micaela B.; Marinsky, Jacob A.

doi:10.1021/j100716a007

Cited by 78 publications

(59 citation statements)

References 1 publication

(1 reference statement)

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“…Also, the high osmotic coefficient of sample III suggests that HPSS formed in the cation exchange process is probably unstable at room temperature and undergoes some form of transformation leading to creation of greater number of osmotically active particles. This is in agreement with the observation of Reddy and Marinsky [14], mentioned earlier in this paper. According to these authors such increase in osmotic coefficient may be due to various reactions that HPSS may undergo at room temperature such as degradation, crosslinking, sulfone formation.…”

Section: Osmotic Coefficient Of Napsssupporting

confidence: 94%

“…We demonstrate that one of the sources by which "foreign" molecules may be introduced is a possible uncontrolled degradation of the polystyrene sulfonic acid (HPSS), which is formed as an intermediate during ion-exchange-based purification. This has already been suggested by Reddy and Marinsky [14]; however, we have subjected the phenomenon to a more detailed study here. In addition our experiment suggests that the ion exchange process itself may introduce ionic species not present in the original sample.…”

Section: Introductionsupporting

confidence: 58%

“…Indeed, several researchers [5,21,22] have employed ion exchange method for purification of NaPSS. However, as reported by Reddy and Marinsky [14], polystyrene sulfonic acid-an intermediate formed during ion exchange-is unstable at room temperatures, and thus any associated "degradation" process may inadvertently introduce impurities in the original sample, if proper care is not taken. In essence for experimental investigations, it is necessary to ensure that there are no additional substances present in a polyelectrolyte system such as NaPSS; or that, if present, they are trace levels, such that they do not affect the properties of the molecule.…”

Section: Introductionmentioning

confidence: 94%

“…Ion-exchange-based purification constitutes a critical step for removal of possible ionic impurities from the original NaPSS sample. Here we followed the procedure due to Reddy and Marinsky [14], which is as follows. The solution of D-NaPSS is first eluted through the anionic resin (Amberlite IRA 400C in hydroxide form) column for 4-5 cycles.…”

Section: Ion Exchangementioning

confidence: 99%

“…Different types of possible impurities have been suggested: surface-active agents [3] or inorganic salts such as Na 2 SO 4 [5]. The presence of the above impurities has strong effect on the polyelectrolyte properties like viscosity [4,[6][7][8][9][10][11], osmotic coefficiency [12][13][14][15], surface tension [16][17][18][19], and so forth. So the removal of the impurities from the commercial sample is essential.…”

Section: Introductionmentioning

confidence: 99%

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On the Importance of Purification of Sodium Polystyrene Sulfonate

Sen

Roy

Juvekar

2012

ISRN Analytical Chemistry

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Ion exchange is commonly employed for purification of sodium polystyrene sulfonate (NaPSS), a molecule widely used as a model polyelectrolyte. However, the present work demonstrates that the ion exchange process itself may introduce some extraneous species into NaPSS samples by two possible mechanisms: (i) chemical transformation of polystyrene sulfonic acid (HPSS), a relatively unstable intermediate formed during ion exchange and (ii) release of small amount of “condensed” acid from cationic resins during the elution of NaPSS molecules. Based on these observations, it is proposed that simple dialysis is adopted as a standard protocol for the purification of primary NaPSS sample.

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Section: Osmotic Coefficient Of Napsssupporting

confidence: 94%

Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 94%

Section: Ion Exchangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Importance of Purification of Sodium Polystyrene Sulfonate

Sen

Roy

Juvekar

2012

ISRN Analytical Chemistry

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Polyelectrolytes

Hoagland¹

2003

Encyclopedia of Polymer Science and Technology

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Polyelectrolytes are polymers that develop substantial charge when dissolved or swollen in a highly polar solvent medium such as water. The attendant electrostatic interactions — within a single polyelectrolyte, between polyelectrolytes, or with molecules/surfaces — produce physical properties much different than those for neutral polymers. Most polyelectrolyte solution and gel properties vary sharply with addition of simple electrolytes, which screen electrostatic interactions according to concentration. Scientists are just beginning to understand polyelectrolyte electrostatic interactions, which are known to play an important role in the natural world. Important concepts for polyelectrolytes are counterion condensation, electrostatic persistence length, electrostatic excluded volume, and Donnan equilibrium. Properties such as low angle scattered intensity, solution viscosity, osmotic pressure, polyelectrolyte and counterion diffusion coefficients, conductivity, adsorption, complexation, electric and magnetic birefringence, electrophoresis, titration, and gel swelling can only be understood by accounting properly for electrostatic interactions. These distinctive properties underlie applications in colloid stabilization, surface modification, rheology control, and controlled release.

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