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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Read or Download Analytical Calorimetry: Proceedings of the American Chemical Society Symposium on Analytical Calorimetry, San Francisco, California, April 2–5, 1968 PDF

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

Sample text

Were annealed under t~e conditions shgwn in Table 1 and increased in thickness from 126 and 145A to 215 and 280A, respectively. These annealed samples melted at 100e/min. without any sign of reorganization during fusion. Using Hoffman and Lauritzen's thermodynamic equation [Tm = TmO (1-20 e / Hr£)] for the melting point lowering due to fold surfaces,6 the equilibrium melting temperature, Tmo , and surface free energy, 0e, for polyethylene single crystals can be evaluated by plotting the observed melting points against reciprocal lamellar thickness, (1/£), where 6Hr = heat of fusion of polyethylene.

C":l ~ ...... ~ Z 8>-< ~ =:0 ~ ::t: >-3 ~ ::t: 28 H. M. 5%w. /min. The peak temperature was taken as the dissolution temperature, Ts, in accordance with a visual experiment. However, a small number of more nearly perfect crystals might exist beyond the temperature when most disappear. Therefore, a second measure of the dissolution temperature, TSI, was taken as the temperature at which the differential temperature falls to the level of the baseline extended. The results are reported in Table II, with equations for the best straight lines obtained by least squares analysis.

5. 6. 7. 8. 9. The recorder, control cabinet and analyzer section were mounted on sponge rubber, Berry shock mounts and Styrofoam, respectively, to reduce vibrations. The analyzer section was housed in a glove box to reduce temperature fluctuations and to enable the system to be operated in a dry nitrogen atmosphere to avoid the condensation of moisture during low temperature experiments. In the analyzer the diffuser plate and shield surrounding the sample holder cups were removed and replaced by a thin sheet of mica at a somewhat lower level.

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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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