Functional polymers for colloidal applications. I. Structural effects of lipophile‐modified polyacrylates on adsorption and dispersion ability

Ping-Lin Kuo, Ta‐Cheng ‐C Chang, Li‐Mei ‐M Lu

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Polyacrylic acids of four molecular weights are prepared. A series of poly(methylacrylate‐acrylic acid) copolymers with four specific methylacrylate/acrylic acid ratios and molecular weights has been successfully synthesized from the corresponding polyacrylic acids. These polymers and copolymers are used as dispersants for dispersing TiO2 into aqueous phase. Viscosity, sedimentation, and electron microscopy are used to evaluate their dispersion ability. The extent of adsorption and the zeta potential are measured to evaluate their adsorption behaviors on the surface of TiO2. The viscosity, sedimentation, and electron microscopy results are comparable parallel for showing the dispersing ability of a polymer or a copolymer. The polymer (or copolymer), which results in a lower viscosity, shows a slower sedimentation rate and a more homogeneous distribution of particles in microphotographs. The minimum viscosity needed to disperse TiO2 decreases with the decreasing molecular weight of polyacrylic acid. It was found that partial esterification of polyacrylic acid results in a broader range of minimum viscosity. The trend of the amount adsorbed is similar to that of zeta potential. These two results are used to interpret the viscosity curve.

Original languageEnglish
Pages (from-to)859-867
Number of pages9
JournalJournal of Applied Polymer Science
Volume44
Issue number5
DOIs
Publication statusPublished - 1992 Jan 1

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carbopol 940
Functional polymers
Polyacrylates
Viscosity
Adsorption
Acids
Copolymers
Sedimentation
Polymers
Molecular weight
Zeta potential
Electron microscopy
Esterification
Acrylics

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "Polyacrylic acids of four molecular weights are prepared. A series of poly(methylacrylate‐acrylic acid) copolymers with four specific methylacrylate/acrylic acid ratios and molecular weights has been successfully synthesized from the corresponding polyacrylic acids. These polymers and copolymers are used as dispersants for dispersing TiO2 into aqueous phase. Viscosity, sedimentation, and electron microscopy are used to evaluate their dispersion ability. The extent of adsorption and the zeta potential are measured to evaluate their adsorption behaviors on the surface of TiO2. The viscosity, sedimentation, and electron microscopy results are comparable parallel for showing the dispersing ability of a polymer or a copolymer. The polymer (or copolymer), which results in a lower viscosity, shows a slower sedimentation rate and a more homogeneous distribution of particles in microphotographs. The minimum viscosity needed to disperse TiO2 decreases with the decreasing molecular weight of polyacrylic acid. It was found that partial esterification of polyacrylic acid results in a broader range of minimum viscosity. The trend of the amount adsorbed is similar to that of zeta potential. These two results are used to interpret the viscosity curve.",
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Functional polymers for colloidal applications. I. Structural effects of lipophile‐modified polyacrylates on adsorption and dispersion ability. / Kuo, Ping-Lin; Chang, Ta‐Cheng ‐C; Lu, Li‐Mei ‐M.

In: Journal of Applied Polymer Science, Vol. 44, No. 5, 01.01.1992, p. 859-867.

Research output: Contribution to journalArticle

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AB - Polyacrylic acids of four molecular weights are prepared. A series of poly(methylacrylate‐acrylic acid) copolymers with four specific methylacrylate/acrylic acid ratios and molecular weights has been successfully synthesized from the corresponding polyacrylic acids. These polymers and copolymers are used as dispersants for dispersing TiO2 into aqueous phase. Viscosity, sedimentation, and electron microscopy are used to evaluate their dispersion ability. The extent of adsorption and the zeta potential are measured to evaluate their adsorption behaviors on the surface of TiO2. The viscosity, sedimentation, and electron microscopy results are comparable parallel for showing the dispersing ability of a polymer or a copolymer. The polymer (or copolymer), which results in a lower viscosity, shows a slower sedimentation rate and a more homogeneous distribution of particles in microphotographs. The minimum viscosity needed to disperse TiO2 decreases with the decreasing molecular weight of polyacrylic acid. It was found that partial esterification of polyacrylic acid results in a broader range of minimum viscosity. The trend of the amount adsorbed is similar to that of zeta potential. These two results are used to interpret the viscosity curve.

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