TY - JOUR
T1 - Polyester textile functionalisation through incorporation of pH/thermo-responsive microgels. Part I: Microgel preparation and characterisation
AU - Glampedaki, Pelagia
AU - Krägel, Jürgen
AU - Petzold, Gudrun
AU - Dutschk, Victoria
AU - Miller, Reinhard
AU - Warmoeskerken, Mijn M.C.G.
PY - 2012
Y1 - 2012
N2 - The present study aims at investigating the properties of pH/thermo-responsive polyelectrolyte microgels intended for surface functionalisation of textiles. Microgels were prepared to have their pH/thermo-responsiveness expressed within the physiological pH and temperature range. They consisted of pH/thermo-responsive microparticles of poly(N-isopropylacrylamide-co-acrylic acid) either alone or complexed with the pH-responsive natural polysaccharide chitosan. Basic characterisation included observation of the microgel morphology and determination of the polyelectrolyte isoelectric points and of the lower critical solution temperatures of the microgels. The analyses were performed by means of scanning electron microscopy, potentiometric titration and differential scanning calorimetry, respectively. Further physicochemical characterisation was conducted using bulk rheology, UV–vis spectroscopy, dynamic light scattering and electrophoresis. These analyses revealed that the studied thermo-responsive microparticles and their complexes with chitosan undergo a volume-phase transition from swollen and hydrophilic to de-swollen and hydrophobic at temperatures close to the average human body temperature. Kinetics measurements showed that this transition is completed in approximately 15 min. Furthermore, the polyelectrolyte complexes exhibit a change of surface charge from positive to negative values at pH 6, i.e. within the physiological pH range. It was, therefore, confirmed that the polyelectrolyte microgels investigated in this study were successfully prepared to have pH/thermo-responsive properties suitable for textile functionalisation
AB - The present study aims at investigating the properties of pH/thermo-responsive polyelectrolyte microgels intended for surface functionalisation of textiles. Microgels were prepared to have their pH/thermo-responsiveness expressed within the physiological pH and temperature range. They consisted of pH/thermo-responsive microparticles of poly(N-isopropylacrylamide-co-acrylic acid) either alone or complexed with the pH-responsive natural polysaccharide chitosan. Basic characterisation included observation of the microgel morphology and determination of the polyelectrolyte isoelectric points and of the lower critical solution temperatures of the microgels. The analyses were performed by means of scanning electron microscopy, potentiometric titration and differential scanning calorimetry, respectively. Further physicochemical characterisation was conducted using bulk rheology, UV–vis spectroscopy, dynamic light scattering and electrophoresis. These analyses revealed that the studied thermo-responsive microparticles and their complexes with chitosan undergo a volume-phase transition from swollen and hydrophilic to de-swollen and hydrophobic at temperatures close to the average human body temperature. Kinetics measurements showed that this transition is completed in approximately 15 min. Furthermore, the polyelectrolyte complexes exhibit a change of surface charge from positive to negative values at pH 6, i.e. within the physiological pH range. It was, therefore, confirmed that the polyelectrolyte microgels investigated in this study were successfully prepared to have pH/thermo-responsive properties suitable for textile functionalisation
KW - Chitosan
KW - N-Isopropylacrylamide
KW - Microgel
KW - Polyelectrolytes
KW - Stimuli-responsiveness
U2 - 10.1016/j.colsurfa.2012.06.022
DO - 10.1016/j.colsurfa.2012.06.022
M3 - Article
SN - 0927-7757
VL - 413
SP - 334
EP - 341
JO - Colloids and surfaces A: Physicochemical and engineering aspects
JF - Colloids and surfaces A: Physicochemical and engineering aspects
ER -