Morphology of undeformed and deformed polyethylene lamellar crystals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F10%3A00349870" target="_blank" >RIV/61389013:_____/10:00349870 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Morphology of undeformed and deformed polyethylene lamellar crystals

Popis výsledku v původním jazyce

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 ?m2 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 m2. 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.

Název v anglickém jazyce

Morphology of undeformed and deformed polyethylene lamellar crystals

Popis výsledku anglicky

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 ?m2 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 m2. 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GAP205%2F10%2F0348" target="_blank" >GAP205/10/0348: Sendvičové nanokompozity: příprava, nukleační efekty, elektrické vlastnosti.</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Polymer

ISSN

0032-3861

e-ISSN

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Svazek periodika

51

Číslo periodika v rámci svazku

24

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

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Kód UT WoS článku

000284248100017

EID výsledku v databázi Scopus

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