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Elastic modulus of the crystalline regions of chitin and chitosan

✍ Scribed by Takashi Nishino; Ryousuke Matsui; Katsuhiko Nakamae

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 153 KB
Volume: 37
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19990601)37:11<1191::aid-polb13>3.0.co;2-h

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✦ Synopsis

The elastic moduli E l of the crystalline regions of ␣-chitin and chitosan in the direction parallel to the chain axis were measured by X-ray diffraction. The E l values were 41 GPa for ␣-chitin, and 65 GPa for chitosan, respectively, at 20°C. The contracted skeletons of ␣-chitin and chitosan are the key factor for the low E l values compared with that (138 GPa) of cellulose I. The E l value of ␣-chitin was constant at 41 GPa both at Ϫ190°C and 150°C, which indicates that the molecular chain of ␣-chitin is stable against heat within the temperature and stress range studied.

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