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The Iα →Iβ transformation of highly crystalline cellulose by annealing in various mediums

Authors :
P. Tekely
G. Excoffier
Henri Chanzy
E. M. Debzi
Junji Sugiyama
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).

Details

ISSN :
15205835 and 00249297
Volume :
24
Database :
OpenAIRE
Journal :
Macromolecules
Accession number :
edsair.doi...........34325d911a76ba4c7d1d29e08e1e7c96
Full Text :
https://doi.org/10.1021/ma00026a002