Phase Transition of pNIPAM Grafted on Plasma-Activated PEO Monitored in-Situ by Quartz Crystal Microbalance
Thermoresponsive poly(N-isopropylacrylamide) layers were grafted on plasmaactivated poly(ethylene oxide)-like substrate. Analysis by ToF-SIMS confirmed the presence of a pNIPAM film, which shows a phase transition temperature at 28 - 32 °C with hysteresis, as determined in-situ by quartz crystal microbalance. During the transition, the frequency of the pNIPAM coated quartz sensor exhibits a pronounced and unexpected minimum while the dissipation changes monotonously. This peculiar behaviour is explained by temporary
formation of water-rich regions, which may cause delayed release and uptake of water during the collapse and re-swelling of the layer.
HEINZ Paul;
BRETAGNOL Frederic;
MANNELLI Ilaria;
GILLILAND Douglas;
RAUSCHER Hubert;
ROSSI Francois;
2008-09-19
IOP Publishing LTD
JRC44452
1742-6588,
https://publications.jrc.ec.europa.eu/repository/handle/JRC44452,
10.1088/1742-6596/100/1/012033,
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