DSpace About DSpace Software

Dyuthi @ CUSAT >
Faculty of Sciences >

Please use this identifier to cite or link to this item: http://purl.org/purl/976

Title: Theory of Breaking of a Potyrner Molecule under Tension
Authors: Rosabella,K Puthur
Sebastian, K L
Sugunan, S
Keywords: Polymer molecule
Theories of fracture
Polymer fracture
Transition state theory
Issue Date: Oct-2001
Publisher: Cochin University of Science and Technology
Citation: Department of Applied Chemistry
Abstract: The thesis presents the dynamics of a polymer chain under tension. It includes existing theories of polymer fracture, important theories of reaction rates, the rate using multidimensional transition state theory and apply it to the case of polyethylene etc. The main findings of the study are; the life time of the bond is somewhat sensitive to the potential lead to rather different answers, for a given potential a rough estimate of the rate can be obtained by a simples approximation that considers the dynamics of only the bond that breaks and neglects the coupling to neighboring bonds. Dynamics of neighboring bonds would decrease the rate, but usually not more than by one order of magnitude, for the breaking of polyethylene, quantum effects are important only for temperatures below 150K, the lifetime strongly depends on the strain and as the strain varies over a narrow range, the life varies rapidly from 105 seconds to 10_5 seconds, if we change one unit of the polymer by a foreign atom, say by one sulphure atom, in the main chain itself, by a weaker bond, the rate is found to increase by orders of magnitude etc.
URI: http://dyuthi.cusat.ac.in/purl/976
Appears in Collections:Faculty of Sciences

Files in This Item:

File Description SizeFormat
Dyuthi-T0312.pdfPDF1.94 MBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback