A DSC study of thermally treated and UV-treated low-density polyethylene |
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Authors: | L. Koski |
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Affiliation: | (1) Building Laboratory, Technical Research Centre of Finland, Bulevardi 31, SF-00180 Helsínkí 18, Finland |
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Abstract: | The melting behaviour of thermally and UV-treated polymer film was studied using DSC. The melting profiles was registered after periods of 24 hours of exposure. The melting profiles after the UV-exposure resembled those observed after heating at 60°. A weak shoulder was first recorded at about 50° and was observed to shift to higher temperatures with increasing exposure time. At the end of the experiments the shoulder was registered around 80°. The changes are compared with results from mechanical tensile tests.
Zusammenfassung Das Schmelzverhalten eines thermisch und UV-behandelten Polymer-films wurde unter Anwendung der DSC untersucht. Das Schmelzprofil wurde nach 24-stündiger Behandlung registriert. Die Schmelzprofile nach UV-Behandlung ähnelten jeden, die nach Erwärmung auf 60° erhalten worden waren. Eine schwache Schulter wurde zuerst bei etwa 50° beobachtet, welche bei steigender Behandlungszeit in Richtung der höheren Temperaturen verschoben wurde. Am Ende der Versuche wurde die Schulter bei etwa 80° registriert. Die Änderungen wurden mit den Ergebnissen mechanischer Dehnteste verglichen.
Résumé On a étudié par analyse calorimétrique différentielle (DSC) le comportement pendant la fusion d'un polymère en film soumis à un traitement thermique et par UV. Les profils de fusion ont été enregistrés après des périodes d'exposition de 24 h. Les profils de fusion après traitement UV ressemblent à ceux obtenus après chauffage à 60 °C. Un faible épaulement vers 50° est d'abord enregistré puis il se déplace vers les températures plus élevées, quand la durée d'exposition augmente. En fin d'expérience l'épaulement se situe vers 80°. Ces modifications sont comparées avec les résultats obtenus à partir des essais mécaniques de traction.
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![iecy](/content/t637m5p227kg52uk/xxlarge1077.gif) ![zcy](/content/t637m5p227kg52uk/xxlarge1079.gif) ![ucy](/content/t637m5p227kg52uk/xxlarge1091.gif) ![softcy](/content/t637m5p227kg52uk/xxlarge1100.gif) ![tcy](/content/t637m5p227kg52uk/xxlarge1090.gif) ![acy](/content/t637m5p227kg52uk/xxlarge1072.gif) ![tcy](/content/t637m5p227kg52uk/xxlarge1090.gif) ![acy](/content/t637m5p227kg52uk/xxlarge1072.gif) ![mcy](/content/t637m5p227kg52uk/xxlarge1084.gif) ![mcy](/content/t637m5p227kg52uk/xxlarge1084.gif) ![iecy](/content/t637m5p227kg52uk/xxlarge1077.gif) ![khcy](/content/t637m5p227kg52uk/xxlarge1093.gif) ![acy](/content/t637m5p227kg52uk/xxlarge1072.gif) ![ncy](/content/t637m5p227kg52uk/xxlarge1085.gif) ![icy](/content/t637m5p227kg52uk/xxlarge1080.gif) ![chcy](/content/t637m5p227kg52uk/xxlarge1095.gif) ![iecy](/content/t637m5p227kg52uk/xxlarge1077.gif) ![scy](/content/t637m5p227kg52uk/xxlarge1089.gif) ![kcy](/content/t637m5p227kg52uk/xxlarge1082.gif) ![icy](/content/t637m5p227kg52uk/xxlarge1080.gif) ![icy](/content/t637m5p227kg52uk/xxlarge1080.gif) ![scy](/content/t637m5p227kg52uk/xxlarge1089.gif) ![pcy](/content/t637m5p227kg52uk/xxlarge1087.gif) ![ycy](/content/t637m5p227kg52uk/xxlarge1099.gif) ![tcy](/content/t637m5p227kg52uk/xxlarge1090.gif) ![ncy](/content/t637m5p227kg52uk/xxlarge1085.gif) ![icy](/content/t637m5p227kg52uk/xxlarge1080.gif) ![ncy](/content/t637m5p227kg52uk/xxlarge1085.gif) ![rcy](/content/t637m5p227kg52uk/xxlarge1088.gif) ![acy](/content/t637m5p227kg52uk/xxlarge1072.gif) ![zcy](/content/t637m5p227kg52uk/xxlarge1079.gif) ![rcy](/content/t637m5p227kg52uk/xxlarge1088.gif) ![ycy](/content/t637m5p227kg52uk/xxlarge1099.gif) .
Valuable assistance from Mrs. E.-L. Svahn is greatefully acknowledged. This work was supported by the Neste Oy Foundation and the Foundation of Technology in Finland. |
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