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Statements

Subject Item
n2:RIV%2F70883521%3A28610%2F11%3A43867327%21RIV12-MSM-28610___
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Etylene-vinyl trimethoxysilane copolymer (EVS) is a type of polyethelene-like material capable to crosslink under moisture even at the room temperature. Hence, the crosslinking proceeds in solid state as well as in the melt opposite to the peroxide crosslinked polyethylene which evolves the crosslinks only above decomposition temperature of peroxide, i.e. in the melt. Furthermore, the crosslinking through silane groups does not involve a step (especially in copolymer) of free radicals creation and thus undesirable side-reactions are restricted to minimum. This work investigates behavior and property evolution of silane crosslinked polyethylene (commercially supplied EVS copolymer) upon thermal ageing in the oven. Copolymer was first mixed with catalytic masterbatch and then extruded on tapes. Subsequently, the specimens were crosslinked in water bath and after that the thermal ageing at two different temperatures takes place. The changes in polymer during ageing were followed by differential scanning calorimetry, infrared spectroscopy and standard tensile testing. It was found that two parallel processes influence the final properties depending on ambient conditions: further crosslinking reactions and improvement of crystalline order. These two processes play different role either the ageing proceed below melting temperature or above melting temperature. Furthermore, improvement of crystalline order has greater influence on mechanical properties then further crosslinking reactions. Ageing below melting temperature involves rearrangement of chains without significant changes in crystalline order whereas ageing above melting temperature exhibits significant changes due to remelting and homogenizing of material and thus different crystallization of more crosslinked chains takes place. Etylene-vinyl trimethoxysilane copolymer (EVS) is a type of polyethelene-like material capable to crosslink under moisture even at the room temperature. Hence, the crosslinking proceeds in solid state as well as in the melt opposite to the peroxide crosslinked polyethylene which evolves the crosslinks only above decomposition temperature of peroxide, i.e. in the melt. Furthermore, the crosslinking through silane groups does not involve a step (especially in copolymer) of free radicals creation and thus undesirable side-reactions are restricted to minimum. This work investigates behavior and property evolution of silane crosslinked polyethylene (commercially supplied EVS copolymer) upon thermal ageing in the oven. Copolymer was first mixed with catalytic masterbatch and then extruded on tapes. Subsequently, the specimens were crosslinked in water bath and after that the thermal ageing at two different temperatures takes place. The changes in polymer during ageing were followed by differential scanning calorimetry, infrared spectroscopy and standard tensile testing. It was found that two parallel processes influence the final properties depending on ambient conditions: further crosslinking reactions and improvement of crystalline order. These two processes play different role either the ageing proceed below melting temperature or above melting temperature. Furthermore, improvement of crystalline order has greater influence on mechanical properties then further crosslinking reactions. Ageing below melting temperature involves rearrangement of chains without significant changes in crystalline order whereas ageing above melting temperature exhibits significant changes due to remelting and homogenizing of material and thus different crystallization of more crosslinked chains takes place.
dcterms:title
Structural changes of moisture crosslinked ethylene-vinyltrimethoxysilane copolymer upon thermal ageing Structural changes of moisture crosslinked ethylene-vinyltrimethoxysilane copolymer upon thermal ageing
skos:prefLabel
Structural changes of moisture crosslinked ethylene-vinyltrimethoxysilane copolymer upon thermal ageing Structural changes of moisture crosslinked ethylene-vinyltrimethoxysilane copolymer upon thermal ageing
skos:notation
RIV/70883521:28610/11:43867327!RIV12-MSM-28610___
n15:predkladatel
n16:orjk%3A28610
n4:aktivita
n7:S
n4:aktivity
S
n4:dodaniDat
n10:2012
n4:domaciTvurceVysledku
n6:4717791 n6:5414482
n4:druhVysledku
n21:D
n4:duvernostUdaju
n13:S
n4:entitaPredkladatele
n12:predkladatel
n4:idSjednocenehoVysledku
232735
n4:idVysledku
RIV/70883521:28610/11:43867327
n4:jazykVysledku
n19:eng
n4:klicovaSlova
moisture crosslinking, EVS copolymer, thermal ageing
n4:klicoveSlovo
n9:EVS%20copolymer n9:thermal%20ageing n9:moisture%20crosslinking
n4:kontrolniKodProRIV
[0AEC4A6EC591]
n4:mistoKonaniAkce
Craiova
n4:mistoVydani
Craiova
n4:nazevZdroje
Book of Abstracts of the 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC1)
n4:obor
n20:CD
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
4
n4:rokUplatneniVysledku
n10:2011
n4:tvurceVysledku
Obadal, Martin Pastorek, Miroslav Navrátilová, Jana Čermák, Roman
n4:typAkce
n18:EUR
n4:zahajeniAkce
2011-10-07+02:00
s:numberOfPages
1
n5:hasPublisher
Central and Eastern European Committee for Thermal Analysis and Calorimetry
n8:isbn
978-606-11-1893-9
n17:organizacniJednotka
28610