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Morphology of undeformed and deformed polyethylene lamellar crystals
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SYSNO ASEP 0349870 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Morphology of undeformed and deformed polyethylene lamellar crystals Author(s) Galeski, A. (PL)
Bartczak, Z. (PL)
Kazmierczak, T. (PL)
Šlouf, Miroslav (UMCH-V) RID, ORCIDSource Title Polymer. - : Elsevier - ISSN 0032-3861
Roč. 51, č. 24 (2010), s. 5780-5787Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords polyethylene ; lamellae ; plastic deformation Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GAP205/10/0348 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000284248100017 DOI 10.1016/j.polymer.2010.10.004 Annotation Morphology of undeformed polyethylene crystals obtained by high pressure crystallization was investigated by SEM. The etching procedure was refined to reveal defected sites of lamellae in addition to differentiation of crystalline and amorphous phases. From 1 to 3 screw dislocations with large Burgers vector per 1 μm2 of lamellae basal planes were detected. High pressure-crystallized polyethylene samples were deformed plastically by uniaxial compression and studied by SEM and AFM. When the deformation is interrupted dislocations are arrested within the crystals. Plastically deformed polyethylene crystals are highly defected – the density of dislocations was approximated as 1016 m−2. However, deformed crystal melting temperature is nearly unaffected while the heat of melting is slightly reduced, yet only in thin crystals. It suggests that the arrested dislocations contribute more to the surface energy of lamellae basal planes rather than to the bulk energy of polyethylene crystals. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2011
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