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Influence of morphology on the microhardness of poly(ethylene naphthalene‐2,6‐dicarboxylate)
Author(s) -
Rueda Daniel R.,
Viksne Armanda,
Malers Laimonis,
Calleja Francisco J. Baltá,
Zachmann Hans G.
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021951213
Subject(s) - crystallization , crystallinity , indentation hardness , lamellar structure , materials science , ethylene , polymer chemistry , volume fraction , morphology (biology) , naphthalene , crystal (programming language) , spherulite (polymer physics) , chemical engineering , composite material , microstructure , chemistry , organic chemistry , biology , computer science , engineering , genetics , programming language , catalysis
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.