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Thermorheology of long chain branched metallocene polyethylene

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Thermorheology of long chain branched metallocene polyethylene

Zhu, Kang (2003) Thermorheology of long chain branched metallocene polyethylene. Masters thesis, Concordia University.

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Abstract

In this study, it was found that the activation energy spectrum could be calculated from the relaxation modulus and we demonstrated that the activation energy spectrum is a characteristic material function. Therefore by combining it with the relaxation spectrum at the reference temperature, viscoelastic properties at different temperatures can be predicted. The thermorheological complexity of long chain branched polymers is caused by a particular relaxation mechanism called arm retraction. An equivalent relaxation mechanism is exhibited by linear polymers at short time scales. According to this theory, linear polymers should be thermorheologically complex in the time range that this mechanism is active, however this has never been observed experimentally. The primary reason for the lack of experimental proof of that theory is the difficulty in accessing experimentally the necessary time scales. In order to make it possible to observe this behavior within the experimental window, a very high molecular weight, monodisperse linear polyethylene was studied

Divisions:Concordia University > Faculty of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Thesis (Masters)
Authors:Zhu, Kang
Pagination:xii, 102 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:Theses (M.A.Sc.)
Program:Mechanical and Industrial Engineering
Date:2003
Thesis Supervisor(s):Wood-Adams, Paula
ID Code:2221
Deposited By:Concordia University Libraries
Deposited On:27 Aug 2009 13:26
Last Modified:08 Dec 2010 10:25
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