Memory effects in isothermal crystallization II. Isotactic polypropylene |
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| Authors: | G C Alfonso A Ziabicki |
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| Institution: | (1) Institute of Industrial Chemistry, University of Genova, Corso Europa 30, 16100 Genova, Italy;(2) Institute of Fundamental Technological Research, Polish Academy of Sciences, 21 Swietobrzyska St., 00049 Warszawa, Poland |
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| Abstract: | The effects of temperature and duration of melting on the rate of isothermal crystallization of isotactic polypropylene were investigated by differential scanning calorimetry (DSC). Crystallization rates were found to decrease with increasing melt temperature and melting time. The results were discussed in the framework of the theoretical model of transient isothermal crystallization developed by the present authors 1]. The results suggest gradual destruction of predetermined nuclei with activation energyE
a=89±7 kJ/mole as a main mechanism of the observed effects.This work and Part I of this research 1] have been supported in part by Research Grant Number PB 1291/52/93/04 from State Committee for Scientific Research (KBN), Poland, and by 40% MURST founds, Italy. |
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| Keywords: | Crystallization crystal nucleation melting melting history thermal history DSC |
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