TY - JOUR
T1 - Real-time observation of coil-to-globule transition in thermosensitive poly(N-isopropylacrylamide) brushes by quartz crystal microbalance
AU - Annaka, Masahiko
AU - Yahiro, Chie
AU - Nagase, Kenichi
AU - Kikuchi, Akihiko
AU - Okano, Teruo
N1 - Funding Information:
The work was partly supported by the R&D project for Environmental Nanotechnology of the Ministry of the Environment (MOE), Japanese government. MA acknowledges the Tokuyama Science Foundation for financial support.
PY - 2007/9/10
Y1 - 2007/9/10
N2 - Thermosensitive poly(N-isopropylacrylamide) (PNIPAm) brushes grafted on SiO2-coated quartz crystal surface were prepared by the surface initiated radical polymerization. Using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM), about 50 nm thickness of PNIPAm brushes were successfully formed. Quartz crystal microbalance with dissipation (QCM-D) is employed to investigate the collapse and swelling behavior of the PNIPAm brushes in water in real time. Both frequency and dissipation of PNIPAm layer were found to change gradually over the temperature range 15-50 °C, indicating that the brushes undergo a continuous transition. This continuous change is attributed to the nonuniformity and stretching of PNIPAm brushes as well as the cooperativity between collapse and dehydration transition.
AB - Thermosensitive poly(N-isopropylacrylamide) (PNIPAm) brushes grafted on SiO2-coated quartz crystal surface were prepared by the surface initiated radical polymerization. Using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM), about 50 nm thickness of PNIPAm brushes were successfully formed. Quartz crystal microbalance with dissipation (QCM-D) is employed to investigate the collapse and swelling behavior of the PNIPAm brushes in water in real time. Both frequency and dissipation of PNIPAm layer were found to change gradually over the temperature range 15-50 °C, indicating that the brushes undergo a continuous transition. This continuous change is attributed to the nonuniformity and stretching of PNIPAm brushes as well as the cooperativity between collapse and dehydration transition.
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U2 - 10.1016/j.polymer.2007.06.067
DO - 10.1016/j.polymer.2007.06.067
M3 - Article
AN - SCOPUS:34548479531
SN - 0032-3861
VL - 48
SP - 5713
EP - 5720
JO - polymer
JF - polymer
IS - 19
ER -