Partially fluorinated thermally responsive latices of linear and crosslinked copolymers

Tao Lowe, Myriam Benhaddou, Heikki Tenhu

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A series of thermally responsive copolymers of N-isopropylacrylamide (NIPAAM) with a fluorinated hydrophobic comonomer, either hexafluoroisopropyl-methacrylate (HFIPMA) or 2,2,3,3,4,4-hexafluorobutylmethacrylate (HFBMA) and a hydrophilic comonomer, methacrylic acid (MAA), were synthesized by emulsion polymerization. The chemical structures of the copolymers were studied by the IR technique. Dynamic light scattering (DLS) showed that aqueous latices of the copolymers exhibited swelling-des welling changes typical to PNIPAAM; the degree of swelling as well as the temperature at which the polymers collapse depended on the chemical structure of the comonomers. Endotherms related to the contraction of the polymers were studied by differential scanning calorimetry (DSC). A combination of DLS and DSC results revealed that the hydrophobic and hydrophilic units in the copolymers strongly affected the swelling behavior, as well as the local environment of the PNIPAAM chains. The comonomer HFIPMA increased the hydrophobicity of NIPAAM, reduced the swelling, and caused coagulation of the copolymer of NIPAAM and HFIPMA at temperatures above the critical temperature. Hydrophobicity of HFIPMA also affected the rheological properties of the latex. The HFBMA comonomer increased the swelling of the latex particles. Methacrylic acid added into the associating copolymers made the copolymers to show poly electrolyte behavior with an increase of swelling and a decrease of the enthalpy change upon the collapse.

Original languageEnglish (US)
Pages (from-to)2141-2152
Number of pages12
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume36
Issue number12
DOIs
StatePublished - Sep 15 1998

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Latex
latex
Latexes
copolymers
swelling
Copolymers
Swelling
Methacrylates
Dynamic light scattering
Hydrophobicity
hydrophobicity
Differential scanning calorimetry
Polymers
light scattering
heat measurement
acids
scanning
Acids
Emulsion polymerization
polymers

All Science Journal Classification (ASJC) codes

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

Cite this

Partially fluorinated thermally responsive latices of linear and crosslinked copolymers. / Lowe, Tao; Benhaddou, Myriam; Tenhu, Heikki.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 36, No. 12, 15.09.1998, p. 2141-2152.

Research output: Contribution to journalArticle

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