Titre :
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Crystallization and microstructure in quenched slabs of various molecular weight polypropylenes
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Auteurs :
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A. Isayev ;
B. Catignani
|
Type de document :
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article/chapitre/communication
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Année de publication :
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1997
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Format :
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p.1526-1539
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Langues:
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= Anglais
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Catégories :
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MATERIAUX
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Mots-clés:
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POLYPROPYLENE
;
CRISTALLISATION
;
MORPHOLOGIE
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Résumé :
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The purpose of this study was to accumulate material data for use in a simulation of morphology and crystallization in quenched slabs of isotactic polypropylenes (i-PP's). The molecular weight effect on the crystallization kinetics of various i-PP's were studied using isothermal and nonisothermal experiments. An experimental setup was constructed to measure the spherulite growth rate of i-PP's using isothermal and nonisothermal melt crystallization experiments. The molecular weight effect on spherulite growth rate of i-PP's was determined. Molecular weight effect on nuclei concentrations as a function of temperature was determined from growth and crystallization rate constants. The morphology and crystallization in quenched slabs of i-PP's were determined from experiments and compared to computer simulations. The molecular weight effect on the degree of crystallinity and morphology was determined for i-PP during quenching.
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Source :
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Polymer engineering and science, vol 37,n°9
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