TY - JOUR
T1 - Microscopic implication of rapid shrinking of comb-type grafted poly(N-isopropylacrylamide) hydrogels
AU - Matsuura, Toyoaki
AU - Sugiyama, Masaaki
AU - Annaka, Masahiko
AU - Hara, Yoshiaki
AU - Okano, Teruo
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 - 2003/7/10
Y1 - 2003/7/10
N2 - The shrinking mechanism of comb-type grafted poly(N-isopropylacrylamide) gel was investigated by small-angle X-ray scattering (SAXS). The SAXS reveals that the microdomain structure with characteristic spacing of 460 Å is developed in the comb-type grafted poly(N-isopropylacrylamide) gel during the shrinking process. These observations suggest 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 small-angle X-ray scattering (SAXS). The SAXS reveals that the microdomain structure with characteristic spacing of 460 Å is developed in the comb-type grafted poly(N-isopropylacrylamide) gel during the shrinking process. These observations suggest 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/S0032-3861(03)00467-1
DO - 10.1016/S0032-3861(03)00467-1
M3 - Article
AN - SCOPUS:0037927988
VL - 44
SP - 4405
EP - 4409
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 16
ER -