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The Iα →Iβ transformation of highly crystalline cellulose by annealing in various mediums
- Source :
- Macromolecules. 24:6816-6822
- Publication Year :
- 1991
- Publisher :
- American Chemical Society (ACS), 1991.
-
Abstract
- 13 C NMR, IR and electron diffraction results show that when annealing conditions ranging from 260°C and 30 min to 280°C and 60 min in a series of mediums ranging from helium gas to various solvents were selected, around 80 % of of the Iα phase could be converted into thr Iβ, whereas a residual 20 % remained unmodified. With polar solvents the transformation occurred at temperatures lower than with nonpolar mediums. Samples of lower crystallinity (bacterial cellulose) were converted more easiliy than highly crystalline samples (Valonia).
- Subjects :
- Chromatography
Polymers and Plastics
Helium gas
biology
Annealing (metallurgy)
Organic Chemistry
Analytical chemistry
Valonia
Carbon-13 NMR
biology.organism_classification
Inorganic Chemistry
chemistry.chemical_compound
Crystallinity
chemistry
Electron diffraction
Bacterial cellulose
Materials Chemistry
Cellulose
Subjects
Details
- ISSN :
- 15205835 and 00249297
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Macromolecules
- Accession number :
- edsair.doi...........34325d911a76ba4c7d1d29e08e1e7c96
- Full Text :
- https://doi.org/10.1021/ma00026a002