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Conditions for the α1-α2 transition in isotactic polypropylene samples

✍ Scribed by C. De Rosa; G. Guerra; R. Napolitano; V. Petraccone; B. Pirozzi

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 378 KB
Volume: 20
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(84)90073-9

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✦ Synopsis

Abstract~Transitions between structural modifications of isotactic polypropylene, characterized by increasing degrees of order in respect to the up and down positioning of the chains, have been studied for samples having different previous thermomechanical histories or containing small amounts of ethylenic units. The annealing temperature ranges, in which such transitions are observed, are strictly related to the positions of the melting endotherm positions for the various samples. For all the recrystallized samples, the same relation has been found between the increases in the melting peak positions and the increases in the parameter selected as a measure of the up-down degree of order.

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