Thermal Properties of Green Polymers and Biocomposites (Hot by Tatsuko Hatakeyama, Hyoe Hatakeyama

By Tatsuko Hatakeyama, Hyoe Hatakeyama

From the studies: "...This rather well written new e-book is usually recommended to educational and commercial researchers and experts drawn to eco-friendly polymers and normally of their thermal properties...This new and opportune ebook covers a few very important homes of eco-friendly polymers and bio-composites." (D. Feldman, Concordia college, Montreal, Canada)

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Measurement; Power compensation type DSC (Perkin Elmer), heating rate = 16 K min-1, N2 atmosphere, sample mass = ca. 8 mg. When the original sample was annealed at a temperature where the exotherm was observed, the exothermic peak decreased depending on annealing temperature and time. Amorphous cellulose samples were maintained isothermally at a temperature range from 390 to 430 K for 60 min. At temperatures higher than ca. 430 K, the transition is completed too rapidly to monitor isothermal state.

46 Chapter 3 Figure 3-8. 92. Mv: viscosity average molecular mass. Experimental conditions; see Figure 3-7 caption. Figure 3-9 shows the relationships between Tg estimated by DSC heating curves of CA with various DS’s and molecular weight. As shown in this figure, when the degree of substitution decreases, glass transition temperature (Tg) maintains a constant value regardless of molecular weight and only depends on degree of substitution. With increasing degree of substitution, Tg decreases due to expansion of intermolecular distance.

1988, Dynamic viscoelasticity and structural changes of regenerated cellulose during water sorption. Polymer, 29, 566. 49. , 1993, Dynamic viscoelastic properties of carboxymethylcellulose during isothermal water sorption, Polymer, 34, 2528-2532 50. , 1986, Dynamic mechanical absorptions observed for regenerated cellulose solids in the temperature range from 280 to 600K. Polym. J. 18, 114. 51. , 1953, Mathematical Structure of the Ttheories of Viscoelasticity. Hermann & Cie, Ơditeurs, Paris. Characterization of Green Polymers 37 52.

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Thermal Properties of Green Polymers and Biocomposites (Hot by Tatsuko Hatakeyama, Hyoe Hatakeyama
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