By J. F. Jackson, L. Mandelkern (auth.), Roger S. Porter, Julian F. Johnson (eds.)
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Extra info for Analytical Calorimetry: Proceedings of the American Chemical Society Symposium on Analytical Calorimetry, San Francisco, California, April 2–5, 1968
Consequently, it is necessary to prepare samples for DTA in a manner that ensures analogous crystal forms at all conditions and to eliminate or account for recrystallization during the run. Furthermore, it is necessary to prepare stable suspensions to avoid the possibility that settling will change the concentration of the active species. E. 1% w solutions followed by filtration and resuspension of the crystals in fresh solvent. 75% w or greater did not settle noticeably. The thermograms for the suspensions are shown in Figure 1, and the data in Table I.
Hoffman and J. J. Weeks, J. Res. Nat. Bur. , A, 66, 13 (1962) A. Y. Coran and C. E. Anagnostopoulous, J. , 57, 13 (1962). A. Peterlin and G. Meinel, J. Appl. , ~, 3221 (1964). V. F. Holland, J. Appl. , }2, 59 1964). 1 THE EQUILIBRIUM MELTING TEMPERATURE AND SURFACE FREE ENERGY OF POLYETHYLENE SINGLE CRYSTALS by H. E. Bair, T. W. Huseby and R. Salovey Bell Telephone Laboratories, Incorporated Murray Hill, New Jersey Chain folded polyethylene single crystals grown from dilute solutions at undercoolings of 2o-4ooc are metastable.
The effect can be seen in the thermograms of Figure 3. The crystals used to obtain Trace II were not filtered at the crystallization temperature and had a thinner border. The peak corresponding to the recrystallized polymer was in this case completely eliminated by isolation of the crystals at the crystallization temperature. Therefore, it is necessary to separate the crystals from the mother liquor at the crystallization temperature to inhibit recrystallization during DTA. It is desirable to extend observations to the highest possible temperatures.