Thermal and theological properties of hydrophobically modified responsive gels

Tao Lowe, Myriam Benhaddou, Heikki Tenhu

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Thermally responsive hydrogels have been prepared of N-isopropylacrylamide (NIPAAM) and a fluorinated hydrophobic comonomer, either hexafiuoroisopropyl methacrylate (HFIPMA) or hexafluorobutyl methacrylate (HFBMA). Terpolymer gels containing an ionizable comonomer, methacrylic acid (MAA), were also synthesized. The swelling and mechanical properties of the gels were investigated in pure water and in aqueous NaCl solutions. All gels show thermosensitivity typical of polyNIPAAM, swelling at lower temperature and deswelling above a certain transition temperature. Hydrogels of NIPAAM and HFIPMA are homogeneous and the corresponding gel modified with methacrylic acid shows the character of a polyelectrolyte gel. However, hydrogels of NIPAAM and HFBMA are heterogeneous and the corresponding acidic gel does not behave as is typical of a polyelectrolyte gel. The acidic gel containing hexafluoroisopropyl-substituted comonomers has a high storage modulus G′, showing that this gel favourably combines the properties of hydrophobically associating polymers and polyelectrolytes. Comparison of the macroscopic gels with chemically similar latex particles showed that the thermal behavior of the particles is mainly determined by the chemical composition but not by the residual surfactant adsorbed onto the polymer particles.

Original languageEnglish (US)
Pages (from-to)51-57
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume200
Issue number1
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

Fingerprint

Gels
thermodynamic properties
gels
Methacrylates
Hydrogels
Polyelectrolytes
swelling
Swelling
Polymers
Hot Temperature
acids
Terpolymers
Acids
Latex
polymers
latex
Latexes
Surface-Active Agents
Particles (particulate matter)
Superconducting transition temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Thermal and theological properties of hydrophobically modified responsive gels. / Lowe, Tao; Benhaddou, Myriam; Tenhu, Heikki.

In: Macromolecular Chemistry and Physics, Vol. 200, No. 1, 01.01.1999, p. 51-57.

Research output: Contribution to journalArticle

Lowe, Tao ; Benhaddou, Myriam ; Tenhu, Heikki. / Thermal and theological properties of hydrophobically modified responsive gels. In: Macromolecular Chemistry and Physics. 1999 ; Vol. 200, No. 1. pp. 51-57.
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