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

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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

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The fraction of crystals which melt beyond the peak temperature is small and decreases rapidly with increasing temperature. loC above point A. 90 C). Analysis of the melting temperatures indicates that with the exception of the crystals grown at 70oC, the width of the melting peak decreases from about 2 0 C to lOC as lamellar reorganization is suppressed. W. D. A. Scott Research and Development Laboratory Dow Chemical of Canada, Limited Sarnia Ontario Canada Introduction The advent of commercial differential thermal analyzers of high resolution requiring only milligram quantities of samples has provided the polymer chemist with a powerful tool for studying the melting behaviour of semi-crystalline polymers.

7. Quinn, F. , Jr. , J. Am. Chern. , Rubber Chern. Tech-:-;-32, 1403Tl959J. 8. Flory, P. J. , ~ Am. Chern. , 85, 3548 (1963). 9· Broadhurst, M. G. , ~ ~ ~ Polymer Sci. Part B, Res. Natl. Bur. , 65A, Res. Natl. Bur. , 70A, 481 (1966) . 10. Hoffman, J. D. E. , 4, 315 (1964) . 11. Brown, R. G. and Eby, R. K. , 12. Illers, K. A. and Hendus, A. , to be published. 13. Fisher, E. W. and Hinrichsen, G. , Polymer, 14. Huseby, T. W. and Bair, H. E. , to be published. 15. Perkin-Elmer Corporation, Thermal Analysis Newsletter, Connecticut.

7 dg/min melt index. They were produced, however, in different plants, and with somewhat different catalyst systems. Fractionations were carried out using the method of Francis, Cooke and Elliot 6 as modified in this laborat ory 7. Molecular weights were determined by inherent viscosity as previously described B • Measurements of melting pOints and heats of melting were carried out using a Perkin Elmer DSC-l calibrated with an indium standard. Samples weighing about 5 mg were contained in covered aluminum sample pans.

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