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Kinetics Of Polymerization And Degradation By Non-Conventional Techniques

Electronic Theses of Indian Institute of Science

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Field Value
 
Title Kinetics Of Polymerization And Degradation By Non-Conventional Techniques
 
Creator Karmore, Vishal K
 
Subject Chemical Engineering
Polymerization
Polymers - Degradation
Polymerization - Non Conventional Methods
Plastic Waste
Incineration
Pyrolysis
Polymer Degradation
Polymer Mixtures
Supercritical Carbon Dioxide
Oxidative Degradation
Supercritical Fluids
 
Description Non-conventional techniques for polymerization and depolymerization were investigated. The rates of polymerization were enhanced higher in ultrasonic, supercritical fluids and microwaves. However in these system under certain conditions, simultaneous degradation also occurred. Depolymerization was studied by various methods like thermal degradation in supercritical fluids and in presence of oxidizers, Lewis acid and other organic acids. Degradation by ultrasound and thermal degradation of polymer mixtures were also investigated. The scission of the polymer backbone is random for thermal degradation while the scission occurs at the midpoint for ultrasonic degradation. The degradation rates in all the investigated techniques were higher than the degradation rates observed for pyrolysis. Degradation was possible at low temperature (< 50°C) for oxidative and ultrasound degradation while the degradation rates were two orders of magnitude higher in supercritical conditions. The molecular weight distribution was obtained by GPC analysis and the continuous distribution models were used to obtain the rate coefficients. The activation energies were calculated from the temperature dependence of the rate coefficients.
 
Publisher Indian Institute of Science
 
Contributor Giridhar, M
 
Date 2007-03-28T04:39:14Z
2007-03-28T04:39:14Z
2007-03-28T04:39:14Z
2001-02
 
Type Electronic Thesis and Dissertation
 
Format 4784453 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/269
null
 
Language en
 
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