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Homogenous Synthesis of Hydroxyethylcellulose in NaOH/Urea Aqueous Solution
Author(s) -
Zhou Jinping,
Qin Ye,
Liu Shilin,
Zhang Lina
Publication year - 2006
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200500148
Subject(s) - aqueous solution , chemistry , cellulose , urea , solubility , proton nmr , intrinsic viscosity , nmr spectra database , viscosity , nuclear chemistry , polymer chemistry , organic chemistry , polymer , materials science , spectral line , composite material , physics , astronomy
Summary: Hydroxyethylcellulose (HEC) was synthesized by a fully homogenous method from cellulose in 7.5 wt.‐% NaOH/11 wt.‐% urea aqueous solutions under mild conditions. HEC samples were characterized with NMR, SEC‐LLS, solubility, and viscosity measurements. The MS and DS values of the obtained HEC samples are in the range from 0.54 to 1.44 and 0.45 to 1.14, respectively, and the relative DS values at C‐2 and C‐6 hydroxyl groups are slightly higher than those at C‐3 hydroxyl groups. HEC samples are soluble in water starting from a MS of 0.57 and DS of 0.49, which display high viscosity in aqueous solutions. Moreover, a NaOH/urea aqueous solution is a stable system for cellulose etherification. In this way, we could provide a simple, pollution‐free, and homogeneous aqueous solution system for synthesizing cellulose ethers.13 C NMR spectra of acetylated HEC (a) in CDCl 3 at 40 °C and (b) in DMSO‐ d 6 at 100 °C.