Interactions of thermally responsive polyelectrolyte latices with low molar mass organic molecules studied by light scattering

Tao Lowe, Heikki Tenhu

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A latex of a thermally responsive polyelectrolytic copolymer of N-isopropylacrylamide, methyl methacrylate, and methacrylic acid was synthesized by emulsion polymerization. An aqueous latex of the copolymer and its mixtures with low molar mass organic compounds, ibuprofen, protocatechuic acid, and ephedrine, were studied by dynamic light scattering at temperatures from 20 to 80 °C. In this temperature range, pure copolymer latex particles gradually collapse with increasing temperature. The interactions of low molar mass compounds with the copolymer strongly depend on the ratio of hydrophilic and hydrophobic structural units in the polymer and in the low molar mass compounds. Ibuprofen and protocatechuic acid were strongly bound to the copolymer latex, causing a decrease in the particle size and a sharpening of the volume transition of the latex particles. Ephedrine is a water-soluble substance, and it was bound to the polymer particles below the lower critical solution temperature LCST. Binding of ephedrine to the polymer led to aggregate formation; the aggregates break down when temperature is increased above the LCST.

Original languageEnglish (US)
Pages (from-to)1590-1594
Number of pages5
JournalMacromolecules
Volume31
Issue number5
DOIs
StatePublished - Mar 1 1998
Externally publishedYes

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Molar mass
Latex
Polyelectrolytes
Latexes
Light scattering
Copolymers
Ephedrine
Molecules
Polymers
Ibuprofen
Particles (particulate matter)
Acids
Temperature
Methacrylates
Emulsion polymerization
Dynamic light scattering
Organic compounds
Particle size
Water
protocatechuic acid

All Science Journal Classification (ASJC) codes

  • Materials Chemistry

Cite this

Interactions of thermally responsive polyelectrolyte latices with low molar mass organic molecules studied by light scattering. / Lowe, Tao; Tenhu, Heikki.

In: Macromolecules, Vol. 31, No. 5, 01.03.1998, p. 1590-1594.

Research output: Contribution to journalArticle

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