TY - CONF
T1 - Hydrogels exhibiting hydrophobicity -high water contact angle and its change on the surface of nanocomposite hydrogel
AU - Haraguchi, Kazutoshi
AU - Li, Huan Jun
AU - Okumura, Noriaki
PY - 2006
Y1 - 2006
N2 - Surface wettability is one of the most important properties, since it reflects the real structure and chemical compositions at the outer-most surface. We recently developed a novel class of nanocomposite hydrogels (NC gels) with a unique organic / inorganic network structure. Here, we report extraordinarily high hydrophobicity, i.e. abnormally high water contact angle (CA), 100° - 150°, observed at the surface of NC gels consisting of hydrophilic constituents; poly(N-isopropylacrylamide), hydrophilic clay and a large amount of water. High values of θW are observed for hydrogels with broad ranges of water and clay contents, and are comparable to or higher than those of well known hydrophobic solid polymers, such as polytetrafluoroethylene (PTFE: CA=110°) and polypropylene (PP: CA=85°). The origin of these high values of CA and their stability are discussed on the basis of gel composition and the surface structure at the gel-air interface.
AB - Surface wettability is one of the most important properties, since it reflects the real structure and chemical compositions at the outer-most surface. We recently developed a novel class of nanocomposite hydrogels (NC gels) with a unique organic / inorganic network structure. Here, we report extraordinarily high hydrophobicity, i.e. abnormally high water contact angle (CA), 100° - 150°, observed at the surface of NC gels consisting of hydrophilic constituents; poly(N-isopropylacrylamide), hydrophilic clay and a large amount of water. High values of θW are observed for hydrogels with broad ranges of water and clay contents, and are comparable to or higher than those of well known hydrophobic solid polymers, such as polytetrafluoroethylene (PTFE: CA=110°) and polypropylene (PP: CA=85°). The origin of these high values of CA and their stability are discussed on the basis of gel composition and the surface structure at the gel-air interface.
KW - Hydrogel
KW - Nanocomposite
KW - PNIPA
KW - Super hydrophobicity
KW - Surface contact angle
UR - http://www.scopus.com/inward/record.url?scp=33846121925&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:33846121925
SP - 4255
EP - 4256
T2 - 55th Society of Polymer Science Japan Symposium on Macromolecules
Y2 - 20 September 2006 through 22 September 2006
ER -