Interactions between polyelectrolytes and sparingly soluble salts

Füredi-Milhofer, Helga; Sarig, S.

doi:10.1016/0960-8974(96)00006-x

Cited by 71 publications

(57 citation statements)

References 53 publications

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“…For this to happen, an important requirement is that the polyelectrolyte must have a high anionic charge density to guarantee strong electrostatic interaction with the crystal surface of the mineral. 48 The reason that low molecular weight Poly-A has better dispersing properties is related to the chain length of the Poly-A. Low molecular weight polyelectrolytes extend more easily as they becomes ionized, thus exposing a greater number of carboxylates.…”

Section: Dispersion Resultsmentioning

confidence: 99%

Polyacrylic acid (poly-A) as a chelant and dispersant

Kuila¹,

Blay²,

Borjas³

et al. 1999

J. Appl. Polym. Sci.

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Polyacrylic acid was synthesized in water by persulfate-initiated polymerization (solution polymerization) of glacial acrylic acid in the absence of a chain-transfer agent. The final product is odorless and colorless. Chelation for calcium ions using a calcium electrode show that our poly(acrylic acid) has a higher chelation capacity than that of existing commercial poly(acrylic acids). A design of experiments was performed to optimize the synthesis conditions to obtain poly(acrylic acid) with a high maximum chelation value. These studies also helped us to gain insight into its high chelation capacity. The chelation capacity for calcium reaches its highest values when polymerization near isothermal conditions is done ϳ 95°C with an acrylic acid concentration of Յ21 wt % and an addition time Ͼ1 h. These conditions favor higher molecular weight poly(acrylic acid) with a polydispersity ϳ 4. The dispersion properties of our poly(acrylic acid) are similar to those of the commercial ones. This dual capability of chelation and dispersion is absent in commercial chelants such as ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), and their analogs. At pH Ͼ 7, chelation of calcium by our poly(acrylic acid) is much higher than that observed with EDTA. Characterization by NMR, Raman, FTIR, and molecular modeling are included in an attempt to understand structural features that can explain the higher chelation capacity of our atactic poly(acrylic acid).

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Section: Dispersion Resultsmentioning

confidence: 99%

Polyacrylic acid (poly-A) as a chelant and dispersant

Kuila¹,

Blay²,

Borjas³

et al. 1999

J. Appl. Polym. Sci.

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“…Thus polymers with certain molecular weight and at defined concentration ranges may act as catalysts of the crystal growth process (33)(34)(35)(36). In the case of cellulose ion binding is weak both due to the weak acid-base behavior of the ionizable hydroxyl groups and also because of their stereochemical arrangement.…”

Section: Fig 3-continuedmentioning

confidence: 99%

Calcium Carbonate Deposition on Cellulose

Dalas

Klepetsanis

Koutsoukos

2000

Journal of Colloid and Interface Science

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“…[29,30] and have therefore long attracted the attention of scientists. Attempts have been recently made to define the general principles governing such interactions and to use this knowledge to propose additives with specific influences on the crystallization processes of interest [31,32].…”

Section: Introductionmentioning

confidence: 99%

Growth morphology of gypsum in the presence of copolymers

Montagnino

Costa

Massaro

et al. 2011

Cryst. Res. Technol.

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Gypsum is the most abundant natural sulphate, and in industrial application it plays an important role in gypsum based binders. Furthermore, it plays a critical role in the hydration of Portland cement, and then gypsum is one of the most important cement additive. In this paper we investigated the role of two commercial polymeric additives in modifying the crystal habits and size of gypsum, growth in aqueous solution. These two additives belong to the categories of acrylic polymers and they are known only by their commercial names of SP1 and SP3. We found that these substances can act as shape modifiers mainly at concentration over 0.04% by weight, with a shortening in the elongation of gypsum crystal and some change in the characters of {001} form, from stepped to flat, due to a change in the growth mechanism

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Interactions between polyelectrolytes and sparingly soluble salts

Cited by 71 publications

References 53 publications

Polyacrylic acid (poly-A) as a chelant and dispersant

Polyacrylic acid (poly-A) as a chelant and dispersant

Calcium Carbonate Deposition on Cellulose

Growth morphology of gypsum in the presence of copolymers

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