Light scattering, viscosity and dynamic birefringence of solutions of poly-n-vinylimidazole

Eskin, V.Ye.; Magarik, S.Ya.; Zhurayev, U.B.; Rudkovskaya, G.D.

doi:10.1016/0032-3950(78)90183-1

Cited by 15 publications

(7 citation statements)

References 3 publications

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“…Two linear regions were apparent: for low MM and for higher MM, with the 106 kDa fraction (n 1/2 = 33.6) being the point of transition. Our data obtained from DLS measurements are consistent with the literature where a similar discontinuity between lowand high-molecular-weight PVI samples has been reported for PVI in methanolic solutions using static light scattering and viscometry, 20 thus confirming the reliability of DLS analysis. The observed transition in the coil size and the protonation behaviours may arise from intra-coil interactions of the polymers, although extensive experimentation would be required in order to fully address this issue.…”

Section: Characterisation Of Pvi Samplessupporting

confidence: 91%

“…20 Potentiometry measurements of PVI solutions with or without sodium silicate were conducted in a temperature-controlled cell at 20 ¡ 0.1 uC using a Multitest IPL-113 ionometer with a combined pH electrode. PVI solutions were titrated against standard 0.1 M HCl.…”

Section: Methodsmentioning

confidence: 99%

“…The molecular weight of the PVI samples was determined by viscometry using the Mark-Houwink-Sakurada equation with parameters taken from the literature. 20 Potentiometry measurements of PVI solutions with or without sodium silicate were conducted in a temperature-controlled cell at 20 ¡ 0.1 uC using a Multitest IPL-113 ionometer with a combined pH electrode. PVI solutions were titrated against standard 0.1 M HCl.…”

Section: Methodsmentioning

confidence: 99%

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Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

et al. 2008

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We show, for the first time, inhibition of silicic acid condensation over a wide range of pH, especially below 9 using certain molecular mass fractions of poly(1-vinylimidazole) (PVI). This is achieved by stabilisation of molybdate-active Si species, which are crucial to condensation and growth to form silica. The structure of the resulting composites depends on the molecular mass of the PVI chains. Long-chain macromolecules can ''encapsulate'' Si species giving rise to stable soluble complexes. Short PVI chains stimulate association of silica particles and at neutral pH precipitation occurs. Protonation of imidazole units in acidic pH results in dissolution of the precipitates. We believe that the results presented herein using PVI as a model system will help elucidate the mechanisms underpinning the molecular interactions between (bio)macromolecules and inorganic materials.

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Section: Characterisation Of Pvi Samplessupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

et al. 2008

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“…21 The molecular masses (MM) of these fractions were determined by viscosity measurement. 22 PVI-7, PVI-14, PVI-48, PVI-106, PVI-240, and PVI-530 were used in this study where the numbers indicate the average MM in kDa. P-His with MM of 39 kDa was used as a reference material.…”

Section: Introductionmentioning

confidence: 99%

Imidazole catalyzed silica synthesis: Progress toward understanding the role of histidine in (bio)silicification

et al. 2009

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Histidine is an amino acid present in proteins involved in biosilica formation and often found in peptides identified during phage display studies but its role(s) and the extent of its involvement in the silica precipitation process is not fully understood. In this contribution we describe results from an in vitro silicification study conducted using poly-histidine (P-His) and a series of different molecular weight synthetic polymers containing the imidazole functionality (polyvinyl imidazole, PVI) for comparison. We show that the presence of imidazole from PVI or P-His is able to catalyze silicic acid condensation; the effect being greater for P-His. The catalytic mechanism is proposed to involve the dual features of the imidazole group-its ability to form hydrogen bonds with silicic acid and electrostatic attraction toward oligomeric silicic acid species

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“…M" was determined in ethanol at 25 °C to be 81 x 103 by using known K and a values. 19 Molecular weights of PVIm formed in the conventional polymerization were determined in 0.1 N HC1/1 M NaCl by a one-point viscometric measurement (cp = 0.3 g/dL) at 25 °C using known K and a values.42 2.2. Polymerizations. All polymerizations were performed at 50 °C with 2,2'-azobis(2-amidinopropane)-2HCl (AAP) as initiator.…”

Section: Introductionmentioning

confidence: 99%

Template polymerization of N-vinylimidazole along poly(methacrylic acid) in water. 1. Influence of template concentration

Grampel¹,

Tan²,

Challa³

1990

Macromolecules

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The radical polymerization of N-vinylimidazole (Vim) was studied in the presence of hydrochloric acid (conventional polymerization), isobutyric acid (blank polymerization), and poly(methacrylic acid) (PMAA) (template polymerization) in aqueous solution at 50 °C. The conventional polymerization showed a deviation from normal kinetics above [VIm]o =* 0.25 M due to the presence of a so-called degradative addition of the radical to the monomer. This side reaction could be fully suppressed by decreasing the pH below 3, resulting in a rate increase. However, at [VIm]o below 0.25 M, a pH reduction led to a decrease in rate. This was explained in terms of electrostatic repulsions between charged chain radicals and the protonated monomers. In the blank polymerization the degradative addition occurred above the higher [VIm]o =* 0.45 M, which is probably due to interactions of Vim with isobutyric acid. Template polymerizations were studied by using variable concentrations of PMAA at a constant [VIm]0 of 0.41 M. Rate enhancements with respect to the blank polymerization were observed up to a factor 6, beyond [PMAA] of 0.18 repeat unit mol/dm3 (=baseM) only. A mechanism is proposed in which rate enhancements arise from the propagation of templateassociated radicals with adsorbed mobile monomers. Complexation of these radicals with the template required the attainment of a critical number of electrostatic interactions, which was calculated.

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Light scattering, viscosity and dynamic birefringence of solutions of poly-n-vinylimidazole

Cited by 15 publications

References 3 publications

Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

Imidazole catalyzed silica synthesis: Progress toward understanding the role of histidine in (bio)silicification

Template polymerization of N-vinylimidazole along poly(methacrylic acid) in water. 1. Influence of template concentration

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