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Characterization of cellulose microbeads prepared by a viscose‐phase‐separation method and their chemical modification with acid anhydride
Author(s) -
Nagaoka Shoji,
Tobata Haruko,
Takiguchi Yasunori,
Satoh Takao,
Sakurai Toshihiko,
Takafuji Makoto,
Ihara Hirotaka
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.21539
Subject(s) - cellulose , viscose , polymer chemistry , chemistry , acetic anhydride , crystallinity , succinic anhydride , chemical modification , aqueous solution , organic chemistry , dispersity , materials science , catalysis , crystallography
Chemically modified cellulose microbeads are useful as cosmetic materials. Cellulose microbeads as supports, prepared by a viscose‐phase‐separation method, are monodisperse and spherical. However, cellulose shows only slight hydrophilicity, even though it has three hydroxyl groups per pyranose ring, because cellulose possesses high crystallinity on account of the cellulose II structure derived from hydrogen bonds among the hydroxyl groups. To increase the hygroscopicity of cellulose microbeads, we have carboxylated them with succinic and glutaric anhydrides. Their hygroscopicity increases with the addition of succinoyl and glutaroyl groups. Moreover, we have confirmed the increased hygroscopicity of microbeads with sodium salinization. We have investigated the decomposition of these hydrophilic cellulose microbeads in aqueous buffer solutions and have confirmed that succinoylated cellulose is more readily decomposed than glutaroylated cellulose microbeads in aqueous solutions. On the other hand, to increase the lipophilicity of cellulose microbeads, we have acylated them with acetic and hexanoic anhydrides. Hydrophobizing microbeads with hexanoyl groups provides an affinity to benzene but not to H 2 O. In contrast, hydrophobizing with acetyl groups provides affinity not only to benzene but also to H 2 O. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 149–157, 2005