Thickening of acrylic lattices with dispersions of crosslinked ethyl acrylate–methacrylic acid copolymers

Quadrat, O.; Mrkvičková, L.; Walterová, Zuzana; Štern, P.; Bradna, Pavel; Šňupárek, Jaromı́r

doi:10.1016/s0300-9440(02)00120-0

Cited by 10 publications

(11 citation statements)

References 13 publications

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“…The viscosity of their emulsions increased and then decreased again with an increase in the amount of ASE, but the light transmittance of the emulsion reduced monotonously with increasing in the amount of ASE. The result showed that the crosslink density in polymers play an important role in the properties of ASAT emulsions . As a linear acrylic polymer, ASAT1 emulsion had the lowest viscosity, highest light transmittance, whereas, the crosslink density of ASATs increased with increasing in the amount of the ASE, which resulted in high viscosity of the emulsion.…”

Section: Resultsmentioning

confidence: 99%

“…As a linear acrylic polymer, ASAT1 emulsion had the lowest viscosity, highest light transmittance, whereas, the crosslink density of ASATs increased with increasing in the amount of the ASE, which resulted in high viscosity of the emulsion. When excess amount of ASE used was used, the swelling ability of microgel decreased and the viscosity of the emulsion reduced . However, The emulsion of high crosslinked polymer had poor light transmittance because microgel with high crosslink density scattered the light rays …”

Section: Resultsmentioning

confidence: 99%

“…When excess amount of ASE used was used, the swelling ability of microgel decreased and the viscosity of the emulsion reduced . However, The emulsion of high crosslinked polymer had poor light transmittance because microgel with high crosslink density scattered the light rays …”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the shear thinning behavior of the emulsions became stronger and stronger with increasing in the amount of ASE. The reason was that the shear thinning behavior increased with increasing in crosslink‐density in polymer …”

Section: Resultsmentioning

confidence: 99%

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Properties of powdered associative alkali‐swellable acrylics thickeners synthesized by precipitation polymerization

Wang

et al. 2014

J of Applied Polymer Sci

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Powdered alkali‐swellable acrylics thickener (ASAT) was synthesized by precipitation polymerization with acrylic acid (AA) and stearyl acrylate (SA) as monomer, allyl sucrose ether (ASE) as crosslink agent and lauroyl peroxide (LPO) as initiator in the solvent of ethyl acetate. The powders were normal distribution in the range 1–80 μm and showed sensitive to pH in water. Before pH 7, both of the viscosity and the light transmittance of the APAT emulsion increased with enhancing pH value. ASE and SA played an important role in the properties of ASAT. When the amount of ASE was increased, the crosslink degree in the ASAT molecule increased. As the result, the viscosity of its emulsion increased firstly and then decreased, but the light transmittance of the emulsion decreased monotonously. Introduction of SA led to formation of an associative ASAT. Therefore, both of the viscosity and light transmittance of ASAT emulsion increased firstly and then decrease with increasing the amount of SA. Meanwhile, the associative ASAT emulsion showed shear thinning behavior, good salt tolerate, and less sensitivity to temperature. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40512.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Properties of powdered associative alkali‐swellable acrylics thickeners synthesized by precipitation polymerization

Wang

et al. 2014

J of Applied Polymer Sci

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“…[4] Microgel emulsions can be used as such, e.g. in aqueous coatings [5,6] or, after replacing water with an organic medium, in solventborne coatings. [7] Microgels have found use in the surface coatings industry, optics, magnetism, electronics, colloid chemistry, biochemistry and medicine.…”

Section: Introductionmentioning

confidence: 99%

Functionalised Microgels for Acrylic Coatings

Machotová

Šňupárek

2009

Macromolecular Symposia

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Summary: Aqueous acrylic dispersions of hydroxy-functionalised copolymer microgel particles crosslinked with allyl methacrylate were synthesized by emulsion polymerization. The microgels were investigated as reactive polymer fillers in mixtures with a water-borne film-forming dispersion. Properties of coatings cast from mixtures of aqueous dispersion of hard microgel particles and film-forming water-borne dispersion were investigated. The swelling behaviour of microgels in selected solvents (aliphatic ketones) as a function of microgel composition is discussed as well. It was found that the swelling ability of microgels decreased with growing degree of crosslinking. Microgels comprising copolymerised butyl methacrylate swelled less in aliphatic ketones than microgels without this comonomer. This work was focused mainly on the influence of microgels incorporated in the commercial solvent-borne acrylic binders on the properties of coatings. It was shown that the application of microgels that were redispersed in acetone did not affect the surface appearance and transparency of coatings. Moreover, the presence of microgel network precursors accelerated film curing at ambient temperature and improved the final hardness of coatings.

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Influences of feeding strategies on AA and MAA carboxylated latexes

Ocepek

Berce

Razboršek

et al. 2015

J of Applied Polymer Sci

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Semibatch, power feed, and shot‐addition feeding strategies were employed to synthesize carboxylated latex under acidic conditions, using emulsion polymerization. As a source of carboxyl groups, acrylic (AA) or methacrylic acid (MAA) was used. The distribution of carboxyl groups between feeding strategies were investigated using rheology, potentiometric/conductometric titrations, transmission electron microscopy, and FT‐IR spectroscopy. Upon alkalization, particle swelling was observed using dynamic light scattering. With increasing pH, both the AA‐ and MAA‐based latexes showed significant increase in hydrodynamic diameter as a consequence of the dissociation state of carboxyl groups. However, only MAA‐based latexes exhibit very pronounced increase in viscosity and storage modulus, and were therefore characterized as gels. The effect of feeding strategies was found to be more pronounced with the MAA functionalized latexes. By employing mentioned three procedures, significant differences in the rheological behavior of the neutralized dispersions were detected. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42062.

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Thickening of acrylic lattices with dispersions of crosslinked ethyl acrylate–methacrylic acid copolymers

Cited by 10 publications

References 13 publications

Properties of powdered associative alkali‐swellable acrylics thickeners synthesized by precipitation polymerization

Properties of powdered associative alkali‐swellable acrylics thickeners synthesized by precipitation polymerization

Functionalised Microgels for Acrylic Coatings

Influences of feeding strategies on AA and MAA carboxylated latexes

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