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Determination of mechanical characteristics of semi‐crystalline thermoplastics in dependence on molecular orientation
Author(s) -
Michaeli Walter,
Gutberlet Dirk,
Glißmann Markus
Publication year - 2000
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20000601)279:1<19::aid-mame19>3.0.co;2-q
Subject(s) - materials science , crystallinity , spherulite (polymer physics) , composite material , homogeneous , modulus , morphology (biology) , compression (physics) , polymer , thermodynamics , physics , genetics , biology
A procedure to obtain poly(propylene) samples which are morphologically homogeneous referring to the degree of crystallinity, spherulite size and molecular orientation is presented. This two step concept is based on compression‐molded plates, in which different molecular orientations are introduced by means of a temperature‐assisted stretching process. The influence and the order of each morphological property on the mechanical behaviour as well as the dependence of the morphological and mechanical properties on the sample preparation are investigated and discussed in detail. Using this procedure samples with a homogeneous morphological structure are obtained. Additionally, first steps are made to characterise quantitatively the dependence of the Young's modulus on the molecular orientation at a constant strain rate and temperature.