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Regioselectively Oxidized Cellulose Ethers
Author(s) -
Yin Xueqiong,
Koschella Andreas,
Heinze Thomas
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950611
Subject(s) - cellulose , chemistry , surface tension , polymer chemistry , polymer , oxidized cellulose , size exclusion chromatography , viscosity , organic chemistry , materials science , enzyme , physics , quantum mechanics , composite material
Summary: 3‐Mono‐ O ‐(2‐methoxyethyl) cellulose (MEC) was selectively oxidized with 2,2,6,6‐tetramethyl‐1‐piperidinyloxy radical (TEMPO)/NaBr/ NaOCl. According to 1D and 2D NMR measurements, the primary hydroxyl group was completely oxidized without affecting the secondary one at position 2. Size‐exclusion chromatography revealed high tendency of 3‐mono‐ O ‐(2‐methoxyethyl)‐6‐carboxyl cellulose (MECO) to aggregate. Viscosity measurement and gelation of MECO upon interaction with chitosan and Cu 2+ ions confirmed the introduction of anionic ions into the polymer backbone. Both MEC and MECO expressed the property of surface activity hence decreasing the surface tension of water (72 mN/m), being 45.0 and 56.8 mN/m, respectively.