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By Gould R.F. (ed.)

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Figure 3-7 shows representative DSC heating curves of cellulose acetate fractions with different molecular mass. When molecular mass increases, thermal decomposition starts immediately after completion of melting or glass transition [22]. Figure 3-7. 92. 35 x 105, Experimental conditions; the viscosity-average molecular weight was estimated using the Mark-Houwick-Sakurada equation at 298 K. N,N-dimethylacetamide was used as a solvent. Power compensate DSC (Perkin Elmer), N2 flow rate = 30 ml min-1, heating rate = 10 K min-1.

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.

58. Farrar, T. C. and Becker, E. , 1971, Pulse and Fourier Transform NMR, Introduction to Theory and Methods, Academic Press, New York. 59. , 1961, The Principels of Nuclear Magnetsm, Clarendon Press, Oxford. Chapter 3 THERMAL PROPERTIES OF CELLULOSE AND ITS DERIVATIVES 1. INTRODUCTION Cellulose is the most abundant organic compound and a representative renewable resource. According to the statistical calculation of the Food and Agriculture Association, US, 3,270 x 109 m3 of cellulose exists on the earth and 1 % of it is currently utilized.

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