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Statements

Subject Item
n2:RIV%2F70883521%3A28610%2F11%3A43867329%21RIV12-MSM-28610___
rdf:type
skos:Concept n13:Vysledek
dcterms:description
Etylene-vinyl trimethoxysilane copolymer (EVS) is a polyethelene-like polymer containing small amount of vinyl trimethoxysilane compound incorporated into the macromolecules by radical copolymerization or by grafting. In contrast to common polyethylene, EVS copolymer is capable to crosslink under moisture due to incorporated vinyl silane compounds. This is the reason, why the crosslinked polyethylene is used for more exacting applications such as hot water pipes, heat-resistant packaging, cable and wire insulations and so on. Crosslinking of EVS copolymer proceeds through two steps, hydrolysis and condensation of silanol groups, thus this process can be easily followed by infrared spectroscopy. Since creation of crosslink between macromolecules causes increase of molecular weight and decrease mobility of molecules, it is obvious that creation of crosslinks must have a significant impact on morphology of copolymer and on overall thermal behavior. Depending on crosslinking and/or ageing temperature, the morphology is influenced in different ways because crosslinking reactions proceed mostly in amorphous region and thus there are the differences between processes in molten or solid state. Ageing and crosslinking of commercially available EVS copolymer in water bath was investigated. Part of copolymer was blended with catalyst masterbatch containing antioxidant and second part without of this catalyst masterbatch. Analytical methods such as infrared spectroscopy, thermal fractionation by differential scanning calorimetry and standard tensile tests were utilized for determination of changes during crosslinking and ageing. It was found that two parallel processes influence the final properties of the water crosslinked, semicrystallic EVS copolymer: (1) crosslinking reactions and (2) improvement of crystalline order. Etylene-vinyl trimethoxysilane copolymer (EVS) is a polyethelene-like polymer containing small amount of vinyl trimethoxysilane compound incorporated into the macromolecules by radical copolymerization or by grafting. In contrast to common polyethylene, EVS copolymer is capable to crosslink under moisture due to incorporated vinyl silane compounds. This is the reason, why the crosslinked polyethylene is used for more exacting applications such as hot water pipes, heat-resistant packaging, cable and wire insulations and so on. Crosslinking of EVS copolymer proceeds through two steps, hydrolysis and condensation of silanol groups, thus this process can be easily followed by infrared spectroscopy. Since creation of crosslink between macromolecules causes increase of molecular weight and decrease mobility of molecules, it is obvious that creation of crosslinks must have a significant impact on morphology of copolymer and on overall thermal behavior. Depending on crosslinking and/or ageing temperature, the morphology is influenced in different ways because crosslinking reactions proceed mostly in amorphous region and thus there are the differences between processes in molten or solid state. Ageing and crosslinking of commercially available EVS copolymer in water bath was investigated. Part of copolymer was blended with catalyst masterbatch containing antioxidant and second part without of this catalyst masterbatch. Analytical methods such as infrared spectroscopy, thermal fractionation by differential scanning calorimetry and standard tensile tests were utilized for determination of changes during crosslinking and ageing. It was found that two parallel processes influence the final properties of the water crosslinked, semicrystallic EVS copolymer: (1) crosslinking reactions and (2) improvement of crystalline order.
dcterms:title
Thermal properties of crosslinked and aged EVS copolymer Thermal properties of crosslinked and aged EVS copolymer
skos:prefLabel
Thermal properties of crosslinked and aged EVS copolymer Thermal properties of crosslinked and aged EVS copolymer
skos:notation
RIV/70883521:28610/11:43867329!RIV12-MSM-28610___
n13:predkladatel
n16:orjk%3A28610
n3:aktivita
n7:S
n3:aktivity
S
n3:dodaniDat
n12:2012
n3:domaciTvurceVysledku
n5:4717791 n5:5414482
n3:druhVysledku
n17:D
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
235182
n3:idVysledku
RIV/70883521:28610/11:43867329
n3:jazykVysledku
n19:eng
n3:klicovaSlova
moisture crosslinking, EVS copolymer, thermal fractionation, differential scanning calorimetry
n3:klicoveSlovo
n8:EVS%20copolymer n8:thermal%20fractionation n8:moisture%20crosslinking n8:differential%20scanning%20calorimetry
n3:kontrolniKodProRIV
[A70461C245E5]
n3:mistoKonaniAkce
Craiova
n3:mistoVydani
Craiova
n3:nazevZdroje
Book of Abstracts of the 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC1)
n3:obor
n18:CD
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n12:2011
n3:tvurceVysledku
Pastorek, Miroslav Čermák, Roman Trňáčková, Petra
n3:typAkce
n6:EUR
n3:zahajeniAkce
2011-10-07+02:00
s:numberOfPages
1
n21:hasPublisher
Central and Eastern European Committee for Thermal Analysis and Calorimetry
n9:isbn
978-606-11-1893-9
n15:organizacniJednotka
28610