Thermoresponsive behaviour in aqueous solution of poly(maleic acid-alt-vinyl acetate) grafted with poly(N-isopropylacrylamide)

The synthesis of a thermoresponsive graft copolymer consisting of a maleic acid/vinyl acetate alternating copolymer backbone (MAc‐alt‐VA) and poly(N‐isopropylacrylamide) (PNIPAM) side chains is reported. Turbidimetric measurements in dilute aqueous solutions showed that no macroscopic phase separati...

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Bibliographic Details
Published in:Polymer international 2004-08, Vol.53 (8), p.1176-1179
Main Authors: Vasile, Cornelia, Bumbu, Gina-Gabriela, Mylonas, Ioannis, Bokias, Georgios, Staikos, Georgios
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
graft copolymers
maleic acid copolymers
Physicochemistry of polymers
poly(N-isopropylacrylamide)
Polymer industry, paints, wood
Technology of polymers
thermothickening
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Summary:The synthesis of a thermoresponsive graft copolymer consisting of a maleic acid/vinyl acetate alternating copolymer backbone (MAc‐alt‐VA) and poly(N‐isopropylacrylamide) (PNIPAM) side chains is reported. Turbidimetric measurements in dilute aqueous solutions showed that no macroscopic phase separation takes place when the temperature is raised above the lower critical solution temperature (LCST) of PNIPAM, even at pH = 2. Moreover, in semi‐dilute aqueous solutions, a pronounced thermally induced viscosity increase (thermothickening) was observed. This thermoresponsive behaviour has been attributed to the interconnection of the hydrophilic MAc‐alt‐VA graft copolymer backbones by means of the hydrophobic PNIPAM side chain aggregates formed as the temperature increases above the LCST of this polymer. Copyright © 2004 Society of Chemical Industry
ISSN:0959-8103
1097-0126
DOI:10.1002/pi.1529