Rheological behaviour of suspensions prepared from plate-shaped titanium dioxide particles in (hydroxypropyl) methylcellulose aqueous solution

Autor: Tadaya Kato, Tomohiro Mukouhara, Hiroshi Yamaguchi, Masami Kawaguchi, Kaoru Maeyama
Rok vydání: 2002
Předmět:
Zdroj: Polymer International. 51:253-261
ISSN: 1097-0126
0959-8103
DOI: 10.1002/pi.824
Popis: Suspensions were prepared by homogeneously mixing titanium dioxide particles in (hydroxypropyl) methylcellulose (HPMC) aqueous solutions. Thin plate-shaped particles were made from balloon materials crushed to pieces. The other three types of particles used as references were plate-shaped samples surface-modified with alumina, and two types of spherical particles of anatase and rutile forms. Plateau adsorption amounts of HPMC onto particles depended on their surface properties. Comparisons of rheological behaviour were carried out among the residual three samples except for the sample having the rutile form. Within the concentration range used, the viscosity values of suspensions were rather lower than that of HPMC aqueous solutions. The reason for such low values was attributed to the decrease of entanglements in the semi-dilute regime and also to steric stabilization resulting from the formation of the HPMC adsorbed layer. The change of structural viscosity and its recovery were evaluated by observation of the decrease of viscosity and its recovery as an indicator. It was confirmed that suspensions of thin plate-shaped particles had superior structural recovery performance. © 2002 Society of Chemical Industry
Databáze: OpenAIRE
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