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Authors
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Kebritchi, A. ; Nekoomansh, M. ; Mohammadi, F. ; Khonakdar, H. A. ; Wagenknecht, U.
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Title
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Thermal behavior of ethylene/1-octene copolymer fractions at high temperatures: Effect of hexyl branch content
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Date
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26.04.2019
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Number
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53345
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Abstract
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<br /><br />In this work, the effect of hexyl branch content on thermal behavior of a fractionated ethylene/1-octene copolymer with emphasis on high temperatures was investigated. The ethylene/1-octene copolymer was carefully fractionated to different fractions with homogenous hexyl branch (HB) content by preparative temperature rising elution fractionation (P-TREF) method. The P-TREF fractions were thermally analyzed via differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and evolved gas analysis (EGA). The P-TREF profile showed a short chain branch distribution (SCBD) of around 1.24. A linear relationship between P-TREF elution temperature (ET) and methylene sequence length (MSL) was presented. The DSC curves exhibited a monolithically increase in melting temperature (Tm) as well as crystallization temperature (Tc) by decreasing short chain branch (SCB) content. The calculated values of lamellae thickness suggested a linear function of SCB content and Tm. The TGA studies of P-TREF fractions depicted a two-stage thermal degradation behavior: pre-degradation and main degradation stages. Tmax for both pre-degradation and main degradation stages was increased for fractions with less hexyl branch content. As an interesting point the pre-degradation stage was found more intensified for more linear fractions. The concentration of main products was found to be affected by the content of hexyl branches using Py-GC-MS.<br /><br />Keywords<br />
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Publisher
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Polyolefins Journal
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Wikidata
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Citation
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Polyolefins Journal 6 (2019) 127-138
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DOI
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https://doi.org/10.22063/POJ.2019.2295.1123
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Tags
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