Influence of Partially Degraded Polymers on the Photodegradation Behaviour of Polyethylene

Arunjunai-Raj Mahendran

Influence of Partially Degraded Polymers on the Photodegradation Behaviour of Polyethylene

Titel in Übersetzung: Einfluß partiell abgebauter Polymere auf das Photodegradationsverhalten von Polyethylenen

Arunjunai-Raj Mahendran

Publikation: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Masterarbeit

Abstract

Eine neuere Entwicklung in der Herstellung photoabbaubarer Polyethylene besteht im Zumischen von partiell abgebauten Polymer (PDP) zu einem nativen Polyethylen. PDP enthält Carbonylgruppen, welche als Initiatoren für weiteren molekularen Abbau wirken. Die vorliegende Arbeit beschäftigt sich mit dem Einfluß von PDP auf das Photoabbauverhalten nativen Polyethylens unter natürlichen und künstlichen Umwelteinflüssen. Der Fortschritt des Abbaus wird mittels Größenausschlußchromatographie verfolgt und mit der Anzahl im System vorhandener Carbonylgruppen korreliert, welche sich durch Infrarotspektroskopie bestimmen lassen. Der molekulare Abbau ist weiterhin verbunden mit einem Anstieg des Kristallinitätsgrades des Polymeren, welcher sich auf die Verarbeitbarkeit der Polymerfolien auswirkt. Aussagen über den Kristallinitätsgrad sind über kalorimetrische Messungen möglich. Die vorliegenden Untersuchungen erlauben Prognosen über Abbauverhalten von Systemen aus vorgeschädigtem und nativen Polyethylen bei verschiedener Witterung. Weiterhin sind Vorhersagen über Verarbeitungsverhalten und mechanischer Eigenschaften möglich.

Titel in Übersetzung	Einfluß partiell abgebauter Polymere auf das Photodegradationsverhalten von Polyethylenen
Originalsprache	Englisch
Qualifikation	Dipl.-Ing.
Gradverleihende Hochschule	Montanuniversität
Betreuer/-in / Berater/-in	Aust, Nicolai, Betreuer (intern)
Datum der Bewilligung	14 Apr. 2006
Publikationsstatus	Veröffentlicht - 2006

Bibliographische Notiz

nicht gesperrt

Schlagwörter

polyethylene
photodegradation
partially degraded polymer (PDP)
carbonyl number (C=O number)
Fourier transform infrared spectroscopy (FTIR)
differential scanning calorimetry (DSC)
size exclusion chromatography (SEC)

Dieses zitieren

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title = "Influence of Partially Degraded Polymers on the Photodegradation Behaviour of Polyethylene",

abstract = "New efforts were made to produce photodegradable polyethylene by mixing partially degraded polymer (PDP) containing carbonyl groups as initiators for molecular degradation with virgin polymers. In the current work the influence of PDP of varying amount on the photodegradation process of a virgin polymer under natural and artificial weathering conditions is investigated. The degree of degradation expressed by average values of the molar mass of the polymer is measured by size exclusion chromatography and correlated with the number of carbonyl groups in the polymer system estimated by Fourier Transform Infrared Spectroscopy. Molecular degradation is also accompanied by an increase in the degree of crystallinity of the polymer which affects the processability of films and is measured by Differential Scanning Calorimetry. Correlation of these measurements helps to judge about the efficiency of a certain PDP in degradation process under various weathering conditions. Furthermore, predictions of the processability and mechanical properties of films containg PDP can be made.",

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N2 - New efforts were made to produce photodegradable polyethylene by mixing partially degraded polymer (PDP) containing carbonyl groups as initiators for molecular degradation with virgin polymers. In the current work the influence of PDP of varying amount on the photodegradation process of a virgin polymer under natural and artificial weathering conditions is investigated. The degree of degradation expressed by average values of the molar mass of the polymer is measured by size exclusion chromatography and correlated with the number of carbonyl groups in the polymer system estimated by Fourier Transform Infrared Spectroscopy. Molecular degradation is also accompanied by an increase in the degree of crystallinity of the polymer which affects the processability of films and is measured by Differential Scanning Calorimetry. Correlation of these measurements helps to judge about the efficiency of a certain PDP in degradation process under various weathering conditions. Furthermore, predictions of the processability and mechanical properties of films containg PDP can be made.

AB - New efforts were made to produce photodegradable polyethylene by mixing partially degraded polymer (PDP) containing carbonyl groups as initiators for molecular degradation with virgin polymers. In the current work the influence of PDP of varying amount on the photodegradation process of a virgin polymer under natural and artificial weathering conditions is investigated. The degree of degradation expressed by average values of the molar mass of the polymer is measured by size exclusion chromatography and correlated with the number of carbonyl groups in the polymer system estimated by Fourier Transform Infrared Spectroscopy. Molecular degradation is also accompanied by an increase in the degree of crystallinity of the polymer which affects the processability of films and is measured by Differential Scanning Calorimetry. Correlation of these measurements helps to judge about the efficiency of a certain PDP in degradation process under various weathering conditions. Furthermore, predictions of the processability and mechanical properties of films containg PDP can be made.

KW - polyethylene

KW - photodegradation

KW - partially degraded polymer (PDP)

KW - carbonyl number (C=O number)

KW - Fourier transform infrared spectroscopy (FTIR)

KW - differential scanning calorimetry (DSC)

KW - size exclusion chromatography (SEC)