High-temperature study of radiation cross-linked ethylene-octene copolymers
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F17%3A63517118" target="_blank" >RIV/70883521:28110/17:63517118 - isvavai.cz</a>
Výsledek na webu
<a href="http://dx.doi.org/10.1007/s00289-016-1703-6" target="_blank" >http://dx.doi.org/10.1007/s00289-016-1703-6</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00289-016-1703-6" target="_blank" >10.1007/s00289-016-1703-6</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
High-temperature study of radiation cross-linked ethylene-octene copolymers
Popis výsledku v původním jazyce
Three ethylene–octene copolymers (EOC) with a wide range of octene content (17, 30, and 38 wt%) and with the same melt flow index of 1 g/10 min were cross-linked by e-beam radiation (in range 30–120 kGy). The testing methods comprised of rheology, a high-temperature creep test, an analysis of the gel content, and a dynamic mechanical analysis (DMA) test. It was discovered that copolymers with a high octene content attain a higher level of cross-linking density. Cross-linking influenced properties below Tm only marginally as seen from the DMA results. However, the properties above Tm were highly influenced as detected by high-temperature creep and rheology. Above Tm, without the presence of crystals, only the chemical bonds holding the amorphous chains together manifested a gradually decreasing creep at 150 °C with an increasing irradiation level. The loss factor (tanδ at 0.1 Hz) at 150 °C revealed a decreasing trend (or higher cross-linking level) with an increasing octene content. High-temperature results were supported by an increasing gel content with increasing octene content. Samples irradiated to 30 kGy dissolved completely in xylene but showed significantly changed rheological characteristics indicating only an increase in the molecular weight and branching. Analysis according to the Charlesby–Pinner equation revealed increased cross-linking to the scission ratio G(X)/G(S) for EOCs with a higher octene content. While the q0 value which relates to cross-linking changed only slightly, a significant decrease in the p0 value which relates to chain scission was discovered.
Název v anglickém jazyce
High-temperature study of radiation cross-linked ethylene-octene copolymers
Popis výsledku anglicky
Three ethylene–octene copolymers (EOC) with a wide range of octene content (17, 30, and 38 wt%) and with the same melt flow index of 1 g/10 min were cross-linked by e-beam radiation (in range 30–120 kGy). The testing methods comprised of rheology, a high-temperature creep test, an analysis of the gel content, and a dynamic mechanical analysis (DMA) test. It was discovered that copolymers with a high octene content attain a higher level of cross-linking density. Cross-linking influenced properties below Tm only marginally as seen from the DMA results. However, the properties above Tm were highly influenced as detected by high-temperature creep and rheology. Above Tm, without the presence of crystals, only the chemical bonds holding the amorphous chains together manifested a gradually decreasing creep at 150 °C with an increasing irradiation level. The loss factor (tanδ at 0.1 Hz) at 150 °C revealed a decreasing trend (or higher cross-linking level) with an increasing octene content. High-temperature results were supported by an increasing gel content with increasing octene content. Samples irradiated to 30 kGy dissolved completely in xylene but showed significantly changed rheological characteristics indicating only an increase in the molecular weight and branching. Analysis according to the Charlesby–Pinner equation revealed increased cross-linking to the scission ratio G(X)/G(S) for EOCs with a higher octene content. While the q0 value which relates to cross-linking changed only slightly, a significant decrease in the p0 value which relates to chain scission was discovered.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10404 - Polymer science
Návaznosti výsledku
Projekt
—
Návaznosti
S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2017
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Polymer Bulletin
ISSN
0170-0839
e-ISSN
—
Svazek periodika
74
Číslo periodika v rámci svazku
1
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
24
Strana od-do
121-144
Kód UT WoS článku
000392033100009
EID výsledku v databázi Scopus
2-s2.0-84973665034