Thermodynamics of aqueous solutions of polyvinylpyrrolidone

Sadeghi, Rahmat; Zafarani-Moattar, Mohammed Taghi

doi:10.1016/j.jct.2004.04.008

Cited by 96 publications

(85 citation statements)

References 13 publications

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“…Studies of various models of solutes have demonstrated that a rise in the partial volume occurs with a loss of solvation [21]. The same behavior was reported in the literature [21][22][23][24]. Assuming the observations above for polymeric solutions and considering the behavior of V for binary and ternary solutions at various temperatures, we may conclude that the loss of solvation of XG or CMC increases with increasing temperature and that the apparent specific volume increases with increasing temperature.…”

Section: Resultssupporting

confidence: 82%

Kinematic Viscosity and Density of Binary and Ternary Mixtures Containing Hydrocolloids, Sodium Chloride, and Water

et al. 2010

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The kinematic viscosity and density of binary aqueous solutions containing xanthan gum and ternary aqueous solutions containing carboxymethyl cellulose and sodium chloride have been measured from 303 K to 318 K at different values of pH. The viscosity and density for binary and ternary systems showed increases with a higher concentration of hydrocolloids (xanthan gum or carboxymethyl cellulose) and reductions with increasing temperature. The presence of NaCl in the ternary systems produced an electro-viscous effect that influenced the viscosity and density of the system. The models used to predict the viscosity, density, and apparent specific volume demonstrated satisfactory results in comparisons with experimental data.

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Section: Resultssupporting

confidence: 82%

Kinematic Viscosity and Density of Binary and Ternary Mixtures Containing Hydrocolloids, Sodium Chloride, and Water

et al. 2010

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“…The approximate validity of such a correlation for aqueous solutions of poly(VP) is supported by viscosity measurements of Sadeghi et al [43] Their data for polymer-water solutions show an exponential increase in viscosity toward higher polymer weight fraction. The <k t > values for polymerization in aqueous solution of 20, 40, 50, 70, and 80 wt.-% VP as well as for bulk VP polymerization are presented in Figure 4.…”

Section: Resultsmentioning

confidence: 78%

Termination Kinetics of 1‐Vinylpyrrolidin‐2‐one Radical Polymerization in Aqueous Solution

Schrooten

Buback

Hesse

et al. 2011

Macro Chemistry & Physics

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Termination kinetics of 1‐vinylpyrrolidin‐2‐one radical polymerization in aqueous solution has been studied at 40 °C between 20 and 100 wt.‐% VP. The <kt>/kp values from laser single‐pulse experiments with microsecond time‐resolved NIR detection of monomer conversion, in conjunction with kp from literature, yield chain‐length‐averaged termination rate coefficients, <kt>. Because of better signal‐to‐noise quality, experiments were carried out at 2 000 bar, but also at 1 500, 1 000, and 500 bar, thus allowing for estimates of <kt> at ambient pressure. The dependence of <kt> on monomer conversion indicates initial control by segmental diffusion followed by translational diffusion and finally reaction diffusion control. To assist the kinetic studies, viscosities of VP–water mixtures at ambient pressure have been determined. magnified image

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“…Poly(vinyl pyrrolidone) (PVP) is a biocompatible polymer [16] widely used as excipient for drugs for oral dosage forms [17] as well as promoter of cell growth and differentiation. PVP exhibits high solubility in water and many organic solvents [18], giving low viscous polymer solutions [19].…”

Section: Introductionmentioning

confidence: 99%

Inkjet printing as a technique for filling of micro-wells with biocompatible polymers

Marizza

Keller

Boisen

2013

Microelectronic Engineering

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a b s t r a c tWe present an innovative technique to dispense precise amounts of polymer solutions into large arrays of microscopic wells. An inkjet printer (NP 2.1 GeSim, Germany) is used to fill micro-wells with poly (vinyl pyrrolidone) (PVP K10). The micro-wells are fabricated with cavity diameters of 300 lm down to 50 lm with SU-8 with two steps of negative photolithography. Inkjet printing is shown to be a suitable technique to dispense defined volumes of solution (down to 0.3 nL) in a highly reproducible way. The filling with polymer can be controlled varying the concentration of the solution and the number of dispensed droplets. Solutions of up to 20 wt.% PVP in water are successfully spotted.

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Thermodynamics of aqueous solutions of polyvinylpyrrolidone

Cited by 96 publications

References 13 publications

Kinematic Viscosity and Density of Binary and Ternary Mixtures Containing Hydrocolloids, Sodium Chloride, and Water

Kinematic Viscosity and Density of Binary and Ternary Mixtures Containing Hydrocolloids, Sodium Chloride, and Water

Termination Kinetics of 1‐Vinylpyrrolidin‐2‐one Radical Polymerization in Aqueous Solution

Inkjet printing as a technique for filling of micro-wells with biocompatible polymers

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