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- W2328503839 abstract "The mechanical properties of pulp sheet, cellulose and hemicellulose were studied by means of the torsion pendulum over a temperature range from -120°C to 190°C. The samples were kept under a vacuum of 10-2mm Hg for more than 48 hours at 20°C, and then for 2 hours at 120°C prior to the measurements. Heating rate was about 1.5°C/min. for all samples.Below room temperature, three mechanical damping peaks were observed for linter cellulose at-100°C, -40°C and -25°C. When the damping vs. temperature curve of linter cellulose is compared with that of triphenylmethyl cellulose, the peak at -100°C is attributed to the motion of C-6 methylol group in the glucose residue. A drastic decrease in the relative rigidity and a large damping peak in pine glucomannan and birch xylan were observed at room temperature, and they are attributed to the motion of side chains of hemicellulose. The shear modulus and damping behavior of pulp sheet are similar to those of linter cellulose over a temperature range from -120°C to room temperature. However, the damping peaks of pulp sheet shift to lower temperature. These results suggest that hemicellulose within pulp sheets has no significant contributions to the molecular motion of cellulose, and that the shift of the damping peaks to the lower temperature region is attributed to the lower degree of orientation of cellulose." @default.
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- W2328503839 date "1974-01-01" @default.
- W2328503839 modified "2023-10-03" @default.
- W2328503839 title "STUDLES ON TEMPERATURE DEPENDENCE OF MECHANICAL PROPERTIES OF CELLULOSE AND HEMICELLULOSE BY MEANS OF TORSION PENDULUM" @default.
- W2328503839 doi "https://doi.org/10.2115/fiber.30.5-6_t221" @default.
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