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Influence of branching density on the cross-linkability of ethylene-octene copolymers

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dc.title Influence of branching density on the cross-linkability of ethylene-octene copolymers en
dc.contributor.author Poongavalappil, Sameepa
dc.contributor.author Svoboda (FT), Petr
dc.contributor.author Theravalappil, Rajesh
dc.contributor.author Svobodová, Dagmar
dc.contributor.author Ougizawa, Toshiaki
dc.contributor.author Sedláček, Tomáš
dc.relation.ispartof Polymer Journal
dc.identifier.issn 0032-3896 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2013
utb.relation.volume 45
utb.relation.issue 6
dc.citation.spage 651
dc.citation.epage 658
dc.type article
dc.language.iso en
dc.publisher Nature Publishing Group (NPG) en
dc.identifier.doi 10.1038/pj.2012.189
dc.relation.uri http://www.nature.com/pj/journal/v45/n6/abs/pj2012189a.html
dc.subject creep en
dc.subject cross-linking en
dc.subject degradation en
dc.subject DSC en
dc.subject ethylene-octene copolymer en
dc.description.abstract Ethylene-octene copolymers (EOCs) with two different octene contents (20 and 35 wt%) and the same melt flow index (3 g per 10 min) were cross-linked using various levels (0.3, 0.5 and 0.7 wt%) of dicumyl peroxide at different temperatures. Cross-linking and degradation were analyzed by rubber process analyzer (RPA) within a temperature range of 150-200 °C. The highest s′ max (maximum elastic torque) and the lowest tan(delta) were found for EOC-20 with low-octene content at all cross-linking temperatures. Lower peroxide efficiency was observed in the case of the high-octene copolymer. Increased degradation was observed with increasing cross-linking temperature. High-octene EOC was found to be more vulnerable to degradation. According to dynamic mechanical analysis, the storage modulus (M′) and the glass transition temperature (T g) obtained from the tan(delta) peaks were found to decrease with increasing octene content. The differential scanning calorimetry (DSC) results show that the octene content has an inverse effect on the crystallinity (X) and melting point (T m) - due to the reduction in the average number of consecutive ethylene units. Creep testing at 150 °C confirmed the cross-linkability results obtained by RPA and the gel content analyses. Increased β-scission due to high numbers of tertiary carbon atoms present in the chain has resulted in the poorer cross-linking and inferior properties of high-octene EOC. © 2013 The Society of Polymer Science, Japan (SPSJ) All rights reserved. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1003371
utb.identifier.obdid 43869824
utb.identifier.scopus 2-s2.0-84878904542
utb.identifier.wok 000319907600011
utb.identifier.coden POLJB
utb.source j-scopus
dc.date.accessioned 2013-07-27T14:55:31Z
dc.date.available 2013-07-27T14:55:31Z
utb.contributor.internalauthor Poongavalappil, Sameepa
utb.contributor.internalauthor Svoboda (FT), Petr
utb.contributor.internalauthor Theravalappil, Rajesh
utb.contributor.internalauthor Svobodová, Dagmar
utb.contributor.internalauthor Sedláček, Tomáš
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