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Hollow-particle latexes: Preparation and properties
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2001 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 39, no 9, 1435-1449 p.Article in journal (Refereed)
Abstract [en]

Hollow-particle latexes were prepared according to the following stages: (1) the preparation of the methyl methacrylate-methacrylic acid (MAA)-ethylene glycol dimethacrylate copolymer (I) latex, (2) the preparation of a shell (II) based on polystyrene or styrene-acrylonitrile-divinyl benzene copolymer polymerized onto copolymer (I) particles, and (3) the neutralization of the core (I) carboxyl groups with a base (NH4OH or NaOH) at temperatures close to the glass-transition temperature of the polymer (II). The neutralization resulted in the expansion of the particles and formed water-filled hollow particles. The microspheres had an overall diameter of 460-650 nm and a hollow diameter of 300-450 nm. Rheological studies and particle size measurements by transmission electron microscopy and dynamic light scattering of the copolymer (I) latex indicate that the maximum particle swelling occurred at an approximately equimolar MAA/base ratio. It was found that even without the neutralization of the MAA units, a small hollow formation in the latex particles occurred during stage 2 because one volume of the copolymer (I) retained about 8 volume parts of water. It was also discovered that the final hollow-particle geometry after neutralization depends on the shell copolymer thickness and type as well as on the conditions during stage 3, that is, the time, temperature, base type, and concentration. The opacifying ability of the synthesized hollow particles was investigated in latex coatings. The opacifying ability values were generally in agreement with the hollow-particle geometry. The only exception was related to the copolymer (I)/copolymer (II) ratio. The maximum hollow volume was obtained at this value equal to 1/8, whereas the highest opacifying ability was observed at 1/10.

Place, publisher, year, edition, pages
2001. Vol. 39, no 9, 1435-1449 p.
Keyword [en]
Carboxylated particles, Core-shell particles, Hollow-formation mechanism, Hollow-particle latex, Neutralization of carboxyl groups
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13224DOI: 10.1002/pola.1120OAI: oai:DiVA.org:ri-13224DiVA: diva2:973420
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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Publisher's full texthttp://onlinelibrary.wiley.com/doi/10.1002/pola.1120/abstract
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Journal of Polymer Science Part A: Polymer Chemistry
Materials Engineering

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
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