Binding of borax to poly(vinyl alcohol) in aqueous solution

Ochiai, Hiroshi; Fujino, Y.; Tadokoro, Yuji; Murakami, Ichiro

doi:10.1016/0032-3861(80)90212-8

Cited by 25 publications

(18 citation statements)

References 14 publications

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“…2 is in agreement with the result in Ref. 3. The applicability of the theory is also shown in the inset of Fig.…”

Section: Binding Isotherm Of Model Asupporting

confidence: 91%

“…Moreover, experimental observations indicate that there are two occupied binding sites per bound borate ion in dilute solution. 3 This implies that a didiol type of complex between two binding sites and a single borate ion is formed on the polymers. The shrinkage of PVA due to cross-links upon addition of borate ions in aqueous solution is also studied using dynamic light scattering.…”

Section: Binding Isotherm Of Model Amentioning

confidence: 99%

“…3,6 The values of K eq are estimated at 27.3 ͓M −1 ͔ and 11.4 ͓M −1 ͔ for the cases of PVA and HPG, respectively. Two neighboring monomers of PVA are identified as a statistical segment in the model.…”

Section: Binding Isotherm Of Model Amentioning

confidence: 99%

“…Complexation of polyvinyl alcohol ͑PVA͒ 3,5,11,16,17 or hydroxypropyl guar ͑HPG͒ 6,10 and borate ions ͑B͑OH͒ 4 −1 ͒ is another prominent example of molecular binding interactions. Isotactic diol groups of these hydrosoluble polymers are capable of binding borate ions in aqueous solution, causing the neutral polymers to become polyelectrolytes after complexation occurs.…”

Section: Introductionmentioning

confidence: 99%

“…1 In particular, phase separation induced by complexation between polymers and ionic molecules [2][3][4][5][6][7][8][9][10] is widely studied in experiments [11][12][13][14] and theory. [15][16][17][18] Noncovalent intermolecular interactions such as hydrogen bonding, dispersion, and electrostatic forces are often employed to bind smaller molecules onto polymers ͑adsorbents͒.…”

Section: Introductionmentioning

confidence: 99%

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Self-consistent field theory of polymer-ionic molecule complexation

Nakamura¹,

Shi²

2010

The Journal of Chemical Physics

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A self-consistent field theory is developed for polymers that are capable of binding small ionic molecules ͑adsorbates͒. The polymer-ionic molecule association is described by Ising-like binding variables, C i ͑a͒ ͑k⌬͒͑=0 or 1͒, whose average determines the number of adsorbed molecules, n BI .Polymer gelation can occur through polymer-ionic molecule complexation in our model. For polymer-polymer cross-links through the ionic molecules, three types of solutions for n BI are obtained, depending on the equilibrium constant of single-ion binding. Spinodal lines calculated from the mean-field free energy exhibit closed-loop regions where the homogeneous phase becomes unstable. This phase instability is driven by the excluded-volume interaction due to the single occupancy of ion-binding sites on the polymers. Moreover, sol-gel transitions are examined using a critical degree of conversion. A gel phase is induced when the concentration of adsorbates is increased. At a higher concentration of the adsorbates, however, a re-entrance from a gel phase into a sol phase arises from the correlation between unoccupied and occupied ion-binding sites. The theory is applied to a model system, poly͑vinyl alcohol͒ and borate ion in aqueous solution with sodium chloride. Good agreement between theory and experiment is obtained.

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“…2 is in agreement with the result in Ref. 3. The applicability of the theory is also shown in the inset of Fig.…”

Section: Binding Isotherm Of Model Asupporting

confidence: 91%

Section: Binding Isotherm Of Model Amentioning

confidence: 99%

Section: Binding Isotherm Of Model Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Self-consistent field theory of polymer-ionic molecule complexation

Nakamura¹,

Shi²

2010

The Journal of Chemical Physics

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Fractionation of Polymers

Barrales‐Rienda

Bello

et al. 1999

The Wiley Database of Polymer Properties

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Intrinsic viscosity of intramolecularly crosslinked polyelectrolyte: Poly(vinyl alcohol)/borax systems

Ochiai¹,

Kurita²,

Murakami³

1988

Makromol. Chem.

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The intrisic viscosity [q] of poly(viny1 alcohol) (PVA) was determined in aqueous solutions with various concentrations q, of borax (N%B40,) as functions of molecular weight Mand concentration cs of NaCl as an added salt. Polyelectrolyte viscosity behaviwr was observed for the systems containing both borax and NaCl, due to the complexation with negatively charged borate ions B(0H)c . [q] changes depending on the ionic strength I. It was found that the Stockmayer-Fixman treatment for the molecular-weight dependence of [q] is valid in the lower molecular-weight range (M < lo5), even though the present PVA chain contains some intrachain crosslinks. Theta conditions can be attained at an appropriate concentration of NaCl. The value of cso is dependent on q,, but the conformational parameter from the Stockmayer-Fixman treatment 4 is almost independent of q,. The effect of intrachain crosslinks becomes evident only as a considerably large negative value for the excluded volume parameter B at infinite ionic strength. In addition, the electrostatic part of the expansion factor 4' was found to be linearly correlated to a reduced parameter (M/Z)"z for all c, systems, from the slope of which the charge density was estimated.

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Binding of borax to poly(vinyl alcohol) in aqueous solution

Cited by 25 publications

References 14 publications

Self-consistent field theory of polymer-ionic molecule complexation

Self-consistent field theory of polymer-ionic molecule complexation

Fractionation of Polymers

Intrinsic viscosity of intramolecularly crosslinked polyelectrolyte: Poly(vinyl alcohol)/borax systems

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