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Rheological behavior of polyolefins during UV irradiation at high temperature as a coupled degradative process.

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Title: Rheological behavior of polyolefins during UV irradiation at high temperature as a coupled degradative process.
Authors: Marek, Adam A.1,2 adam.a.marek@polsl.pl, Verney, Vincent1,3 vincent.verney@univ-bpclermont.fr
Source: European Polymer Journal. Nov2015, Vol. 72, p1-11. 11p.
Subjects: Polyolefins, Irradiation, High temperatures, Rheology (Biology), Crosslinking (Polymerization)
Abstract: The photo-rheology method was applied to determinate the differences in the rheological behavior of selected polyolefins (PP, HDPE and LDPE) over a range of temperatures, higher than melting temperatures (160–200 °C) and during UV irradiation as a coupled degradative conditions in air atmosphere. Both, UV mercury lamp and UV LED were used as irradiation source. Multiwave experiments were performed and viscoelastic data were plotted in the complex plane to obtain Cole–Cole plots at different conditions. It helped to assess the molecular evolution of the examined materials. The competition between chain scissions and chain recombination (crosslinking) was observed. Chain scission reactions occurred in PP and for HDPE and LDPE crosslinking reactions predominated, especially over 180 °C. UV irradiation intensified these effects. In the case of HDPE chain scission reactions were also observed especially below 180 °C in processes performed without UV. At higher temperature and under UV irradiation crosslinking reactions and increase of viscosity began to dominate. Despite different energy and emission spectra of irradiation sources, the similar effects were observed. [ABSTRACT FROM AUTHOR]
Copyright of European Polymer Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Rheological behavior of polyolefins during UV irradiation at high temperature as a coupled degradative process.
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  Data: <searchLink fieldCode="JN" term="%22European+Polymer+Journal%22">European Polymer Journal</searchLink>. Nov2015, Vol. 72, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Polyolefins%22">Polyolefins</searchLink><br /><searchLink fieldCode="DE" term="%22Irradiation%22">Irradiation</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Rheology+%28Biology%29%22">Rheology (Biology)</searchLink><br /><searchLink fieldCode="DE" term="%22Crosslinking+%28Polymerization%29%22">Crosslinking (Polymerization)</searchLink>
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  Data: The photo-rheology method was applied to determinate the differences in the rheological behavior of selected polyolefins (PP, HDPE and LDPE) over a range of temperatures, higher than melting temperatures (160–200 °C) and during UV irradiation as a coupled degradative conditions in air atmosphere. Both, UV mercury lamp and UV LED were used as irradiation source. Multiwave experiments were performed and viscoelastic data were plotted in the complex plane to obtain Cole–Cole plots at different conditions. It helped to assess the molecular evolution of the examined materials. The competition between chain scissions and chain recombination (crosslinking) was observed. Chain scission reactions occurred in PP and for HDPE and LDPE crosslinking reactions predominated, especially over 180 °C. UV irradiation intensified these effects. In the case of HDPE chain scission reactions were also observed especially below 180 °C in processes performed without UV. At higher temperature and under UV irradiation crosslinking reactions and increase of viscosity began to dominate. Despite different energy and emission spectra of irradiation sources, the similar effects were observed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of European Polymer Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.eurpolymj.2015.09.003
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Polyolefins
        Type: general
      – SubjectFull: Irradiation
        Type: general
      – SubjectFull: High temperatures
        Type: general
      – SubjectFull: Rheology (Biology)
        Type: general
      – SubjectFull: Crosslinking (Polymerization)
        Type: general
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      – TitleFull: Rheological behavior of polyolefins during UV irradiation at high temperature as a coupled degradative process.
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              Text: Nov2015
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              Y: 2015
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              Value: 72
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