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
Five melting compounds were used to obtain a temperature correction curve between 700 and l56°e at a heating rate of 10oe/min. for the platinum resistance thermometers in the Perkin-Elmer differential scanning calorimeter. The melting temperatures, Tm, of polyethylene samples were determined as described in the Appendix. 0 129·8±1. 3 T ,oe _m_ Crystal 65>2 56±2 57±2 58±2 59±2 57±2 61±2 54±2 57±2 54<2 48<2 56±2 51±2 278±30 215±20 178>15 145±6 126±6 Small crystalline overgrowths Single platelets i approximately 10 microns across Monolayered, truncated platelets; about 10 microns across Smooth edged, multiple-layered crystals; several microns across 111±5 52±2 49'2 5D±2 ~ DendritiC, many-layered crystals; several microns across 104±5 Thickness,i 50±2 50±2 47±2 41±2 Qr' ~ \felting temperature of" unthickened and unirradiated crystals f"ran aultiple peaked thennograms (Fig.
Bell, Cavendish Laboratories, University of Cambridge for valuable assistance with electron microscopy and Dr. D. A. Blackadder, Department of Chemical Engineering, University of Cambridge, for many useful suggestions and discussions during the course of the work. REFERENCES 1. 2. 3. 4. 5. 6. 7. P. H. Geil, Polymer Single Crystals, Interscience: London, 1963. L. Mandelkern, Crystallization of Polymers, McGraw-Hill: New York, 1964. -P. H. Lindenmeyer, J. , 5, (1963). J. D. Hoffman and J. J. Weeks, J.
To be published. 15. Perkin-Elmer Corporation, Thermal Analysis Newsletter, Connecticut. 16. Broadhurst, M. , ~ Res. Natl. Bur. , 66A, 241 (1962). ~ 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.
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.)