Abstract
TEMPO/NaClO/NaBr and sodium periodate were combined in a one-shot reaction to oxidise cellulose from bleached pulp. Oxidation of cellulose forms two fractions: a highly-carboxylated water-insoluble (up to 1.9 mmol COO−/g, DS = 0.39) and a water-soluble fraction (up to 4 mmol COO−/g, DS = 1.1). Results show that these regioselective oxidants work in synergy to produce fully-oxidised 2,3,6-tricarboxycellulose. Increasing the periodate concentration results in fibrillation and extensive depolymerisation of the pulp cellulose as more residual aldehyde groups participate in the depolymerisation process. X-ray diffraction (XRD) reveals that the addition of periodate increases cellulose crystallinity, retains crystal size but slightly alters the XRD pattern. The degree of substitution (DS), which governs the solubility of carboxylated cellulose, can be controlled by varying the periodate concentration. Combining TEMPO/NaBr/NaClO with sodium periodate simultaneously in a one-shot reaction produces low-cost cellulose with controlled level of carboxylation and unique properties.
| Original language | English |
|---|---|
| Article number | 115292 |
| Number of pages | 10 |
| Journal | Carbohydrate Polymers |
| Volume | 226 |
| DOIs | |
| Publication status | Published - 15 Dec 2019 |
Keywords
- Carboxylated cellulose
- Degree of polymerisation (DP)
- Degree of substitution (DS)
- Periodate
- Solubility
- TEMPO
Cite this
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One-shot TEMPO-periodate oxidation of native cellulose. / Mendoza, David Joram; Browne, Christine; Raghuwanshi, Vikram Singh; Simon, George P.; Garnier, Gil.
In: Carbohydrate Polymers, Vol. 226, 115292, 15.12.2019.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - One-shot TEMPO-periodate oxidation of native cellulose
AU - Mendoza, David Joram
AU - Browne, Christine
AU - Raghuwanshi, Vikram Singh
AU - Simon, George P.
AU - Garnier, Gil
PY - 2019/12/15
Y1 - 2019/12/15
N2 - TEMPO/NaClO/NaBr and sodium periodate were combined in a one-shot reaction to oxidise cellulose from bleached pulp. Oxidation of cellulose forms two fractions: a highly-carboxylated water-insoluble (up to 1.9 mmol COO−/g, DS = 0.39) and a water-soluble fraction (up to 4 mmol COO−/g, DS = 1.1). Results show that these regioselective oxidants work in synergy to produce fully-oxidised 2,3,6-tricarboxycellulose. Increasing the periodate concentration results in fibrillation and extensive depolymerisation of the pulp cellulose as more residual aldehyde groups participate in the depolymerisation process. X-ray diffraction (XRD) reveals that the addition of periodate increases cellulose crystallinity, retains crystal size but slightly alters the XRD pattern. The degree of substitution (DS), which governs the solubility of carboxylated cellulose, can be controlled by varying the periodate concentration. Combining TEMPO/NaBr/NaClO with sodium periodate simultaneously in a one-shot reaction produces low-cost cellulose with controlled level of carboxylation and unique properties.
AB - TEMPO/NaClO/NaBr and sodium periodate were combined in a one-shot reaction to oxidise cellulose from bleached pulp. Oxidation of cellulose forms two fractions: a highly-carboxylated water-insoluble (up to 1.9 mmol COO−/g, DS = 0.39) and a water-soluble fraction (up to 4 mmol COO−/g, DS = 1.1). Results show that these regioselective oxidants work in synergy to produce fully-oxidised 2,3,6-tricarboxycellulose. Increasing the periodate concentration results in fibrillation and extensive depolymerisation of the pulp cellulose as more residual aldehyde groups participate in the depolymerisation process. X-ray diffraction (XRD) reveals that the addition of periodate increases cellulose crystallinity, retains crystal size but slightly alters the XRD pattern. The degree of substitution (DS), which governs the solubility of carboxylated cellulose, can be controlled by varying the periodate concentration. Combining TEMPO/NaBr/NaClO with sodium periodate simultaneously in a one-shot reaction produces low-cost cellulose with controlled level of carboxylation and unique properties.
KW - Carboxylated cellulose
KW - Degree of polymerisation (DP)
KW - Degree of substitution (DS)
KW - Periodate
KW - Solubility
KW - TEMPO
UR - http://www.scopus.com/inward/record.url?scp=85072243235&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2019.115292
DO - 10.1016/j.carbpol.2019.115292
M3 - Article
AN - SCOPUS:85072243235
VL - 226
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
SN - 0144-8617
M1 - 115292
ER -