AI Article Synopsis
- This study examines how adding carboxyl (COOH) and aldehyde (CHO) functional groups to different positions on cellulose affects its thermal stability.
- The findings reveal that 2,3-dialdehyde cellulose is the most thermally stable, while the presence of a carboxyl group at the C6 position leads to instability.
- More reducing end groups in the cellulose polymer chain correlate with lower thermal stability, indicating the impact of functional groups on the stability of oxidized cellulose products.
Article Abstract
Oxidized cellulose containing carboxyl and aldehyde functional groups represent an important class of cellulose derivatives. In this study effect of incrementally increasing COOH and CHO groups at C2, C3, and C6 positions of cellulose and nanocellulose has been investigated, with a view to understanding their effect on thermal treatment of cellulose. The results show that 2,3-dialdehyde cellulose (DAC) is the most thermally stable oxidized product of cellulose while the most unstable derivatives contain carboxyl group at the C6 position (6CC). Carboxymethylcellulose (CMC), with carboxymethyl group on C6 position, is more stable than 6CC. Multi-functionalized celluloses 2,3,6-tricarboxycellulose and 6-carboxy-2,3-dialdehyde, have the same level of thermal stability as 6CC, showing that the presence of carboxyl at the C6 is a key destabilizing factor in the thermal stability of oxidized cellulose products. More the number of reducing end groups on the polymer chain, lower the thermal stability of the cellulose, as proved by comparing the TGA/DTG of monomeric analogs dextrose, cellobiose and glucuronic acid with the oxidized celluloses. The thermal stability trend observed for oxidized celluloses was DAC>DCC>nanoparticles>dextrose>glucuronic acid, caused by extent of reducing ends and COOH groups.
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| http://dx.doi.org/10.1016/j.carbpol.2014.08.032 | DOI Listing |
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