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Homogeneous hydroxy...
Homogeneous hydroxyethylation of cellulose in NaOH/urea aqueous solution
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- Zhou, Qi (författare)
- KTH,Glykovetenskap
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Zhang, L. N. (författare)
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Li, M. (författare)
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Wu, X. J. (författare)
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Cheng, G. Z. (författare)
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(creator_code:org_t)
- 2005-01-17
- 2005
- Engelska.
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Ingår i: Polymer Bulletin. - : Springer Science and Business Media LLC. - 0170-0839 .- 1436-2449. ; 53:4, s. 243-248
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The 6 wt.% NaOH/4 wt.% urea aqueous solution was proved to be an aqueous nonderivatizing solvent for cellulose by C-13 NMR. O-(2-hydroxyethyl) cellulose (HEC) was prepared by a totally homogeneous hydroxyethylation of cellulose using this new solvent for the first time, and the distribution of substituents within anhydroglucose units (AGU) was examined by C-13 NMR. It was found that the relative reactivity of the hydroxyl groups within AGU and the new hydroxyl group was in the order C-x > C-6 > C-2 > C-3, an analogous functionalization pattern as HEC obtained by the heterogeneous slurry process. The ethylene oxide efficiency in this homogeneous etherification reaction was 20 - 30%.
Nyckelord
- c-13 nmr
- substituents
- derivatives
- solubility
- solvent
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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