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Author(s): |
Chang-jiang Yu, Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Hainan university,
Xue-qiong Yin, Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Hainan university,
Li Ji, Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Hainan university,
Guo-xin Yong, Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Hainan university,
Xue-qiong Yin, Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Hainan university, |
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Abstract: |
Carboxymethylated Bacterial Cellulose (CMC )was synthesized through carboxymethylation with chloroacetic acid, using bacterial cellulose ( BC ) as the starting material. It was found that the optimal conditions to obtain high degreeof substitution (DS) were as follows: alkalination for 40 min under ultrasonic wave treatment, the mole ratio of chloroacetic acid to BC being 4.5:1, first etherification lasting 30min at 50°C, and second etherification lasting 90min at 60 °C. DS 48.04%CMC was synthesized at above conditions. All CMCs with DS 32-48% are soluble in water, insoluble in DMSO. Aqueous solution of CMC expresses polyelectrolyte effect, which could be eliminated by NaCl with proper concentration.
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