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Influence of morphology on the microhardness of poly(ethylene naphthalene-2,6-dicarboxylate)

✍ Scribed by Daniel R. Rueda; Armanda Viksne; Laimonis Malers; Francisco J. Baltá Calleja; Hans G. Zachmann

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
355 KB
Volume
195
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The microhardness (H) of poly(ethylene naphthalene‐2,6‐dicarboxylate) (PEN) with a wide range of crystallinities, spherulitic morphologies and different lamellar periodicities has been determined. The influence of the temperature and time of crystallization from the glassy state upon the microhardness values has been examined. For structures where primary crystallization is incomplete, it is shown that H increases linearly with the volume fraction of spherulites. For materials where primary crystallization is completed, H depends on the crystallization temperature and appears to be a function of both the crystallinity and the crystal size. The results are discussed in the light of theoretical predictions of hardness.

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