The elastic modulus of isotropic semicrystalline polymers
β Scribed by Lawrence E. Nielsen
- Publisher
- John Wiley and Sons
- Year
- 1975
- Tongue
- English
- Weight
- 109 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0021-8995
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π SIMILAR VOLUMES
## Abstract A model based on the concept of fractional calculus is proposed for the description of the dynamic elastic modulus, __E__\* = __E__β² + __iE__β³, of polymer materials. This model takes into account three relaxation phenomena (Ξ±, Ξ², and Ξ³) under isochronal conditions. The differential equa
The elastic moduli E l of the crystalline regions of β£-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 β£-chitin, and 65 GPa for chitosan, respectively, at 20Β°C. The contracted skeletons of β£-chitin and chitosan are th