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By J. F. Jackson, L. Mandelkern (auth.), Roger S. Porter, Julian F. Johnson (eds.)

ISBN-10: 1475700016

ISBN-13: 9781475700015

ISBN-10: 1475700032

ISBN-13: 9781475700039

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Additional resources for Analytical Calorimetry: Proceedings of the American Chemical Society Symposium on Analytical Calorimetry, San Francisco, California, April 2–5, 1968

Example text

Z ><: 0 t::l ~ :0 ::c: i:':! >-3 ::c: i:':! 26 H. M. 5% w. Typical results are shown in Figure 2 for the crystals prepared at 70°C. Although the total peak area was proportional to the rate of heating, the relative area of the second peak increased at lower heating rates, indicating a greater amount of recrystallization. /min. /m1n. for the crystals prepared at 85°C. Recrystallization during DTA appears to involve the reprecipitation of dissolved polymer at a temperature between the original crystallization temperature and the dissolution temperature of the original crystals.

Appl. , 35, 1156 (1964 ). I, 195 (1966) . 2, Norwalk, 39 40 H. E. BAIR, T. W. HUSEBY, AND R. SALOVEY APPENDIX A thermal lag develops in the differential scanning calorimeter between a sample undergoing fusion (and thereby maintaining a constant temperature) and the calorimeter vessel whose temperature is increasing at a programmed rate. An explanation of how to correct for this thermal lag is available from the Perkin-Elmer Corporation. 1 5 The multiple peaked thermogram in Fig. 9 indicates the magnitude of the correction for the melting of a paraffin, ~-C36H74' The lower temperature peak results from a crystal transformation from orthorhombic to hexagonal16 which allows free rotation about the main chain axis.

F TEMPERATURE. 4 o "... 2 Fig. 6. Mass fraction of unirradiated crystals which thicken during heating at 10°C/min to melt above the melting temperature of the unreorganized crystals as a function of crystallization temperature. THE EQUILIBRIUM MELTING TEMPERATURE AND SURFACE FREE ENERGY 37 has analyzed the experimental melting results of Brown and Ebyll on bulk crystallized polyeth~lene of various long periods and found Tmo = l43±0·5 0C and 0e = 57±4 erg/cm. However, since Brown and Eby determined melting points by heating samples at 20C/min.

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Analytical Calorimetry: Proceedings of the American Chemical Society Symposium on Analytical Calorimetry, San Francisco, California, April 2–5, 1968 by J. F. Jackson, L. Mandelkern (auth.), Roger S. Porter, Julian F. Johnson (eds.)


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