TY - JOUR
T1 - Study on the rapid deswelling mechanism of comb-type N-isopropylacrylamide gels
AU - Annaka, M.
AU - Matsuura, T.
AU - Yoshimoto, E.
AU - Taguchi, H.
AU - Sasaki, S.
AU - Sugiyama, M.
AU - Hara, Y.
AU - Okano, T.
N1 - Funding Information:
This work has been supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Science, and Culture. The SAXS experiments were performed under the approval of the Photon Factory Advisory Committee (proposal No.2000G242).
PY - 2004/11/15
Y1 - 2004/11/15
N2 - The shrinking mechanism of comb-type grafted poly(N-isopropylacrylamide) gel was investigated by fluorescence spectroscopy and small-angle X-ray Scattering (SAXS). The SAXS reveals that the microdomain structure with characteristic dimension of 460 Å is developed in the comb-type grafted poly(N-isopropylacrylamide) gel during the shrinking process. Fluorescence spectroscopy together with SAXS observation suggests that the freely mobile characteristics of the grafted chains are expected to show the rapid dehydration to make tightly packed globules with temperature, followed by the subsequent hydrophobic intermolecular aggregation of the dehydrated graft chains. The dehydrated grafted chains created the hydrophobic cores, which enhance the hydrophobic aggregation of the networks. These aggregations of the NIPA chains contribute to an increase in void volume, which allow the gel having a pathway of water molecules by the phase separation.
AB - The shrinking mechanism of comb-type grafted poly(N-isopropylacrylamide) gel was investigated by fluorescence spectroscopy and small-angle X-ray Scattering (SAXS). The SAXS reveals that the microdomain structure with characteristic dimension of 460 Å is developed in the comb-type grafted poly(N-isopropylacrylamide) gel during the shrinking process. Fluorescence spectroscopy together with SAXS observation suggests that the freely mobile characteristics of the grafted chains are expected to show the rapid dehydration to make tightly packed globules with temperature, followed by the subsequent hydrophobic intermolecular aggregation of the dehydrated graft chains. The dehydrated grafted chains created the hydrophobic cores, which enhance the hydrophobic aggregation of the networks. These aggregations of the NIPA chains contribute to an increase in void volume, which allow the gel having a pathway of water molecules by the phase separation.
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U2 - 10.1016/j.colsurfb.2004.03.021
DO - 10.1016/j.colsurfb.2004.03.021
M3 - Article
C2 - 15542326
AN - SCOPUS:8144223341
VL - 38
SP - 201
EP - 207
JO - Colloids and Surfaces B: Biointerfaces
JF - Colloids and Surfaces B: Biointerfaces
SN - 0927-7765
IS - 3-4 SPEC. ISS.
ER -