| Sign In to gain access to subscriptions and/or personal tools. |
The Non-isothermal Degradation Process of some Polyethers and Azo-polyethersGh. Asachi' Technical University Iasi, Faculty of Chemical Engineering, B-dul D. Mangeron 71, Iasi-700050, Romania
Gh. Asachi' Technical University Iasi, Faculty of Chemical Engineering, B-dul D. Mangeron 71, Iasi-700050, Romania, gapreot{at}ch.tuiasi.ro or gapreot{at}yahoo.com
Al. I. Cuza' University Iasi, Faculty of Chemistry, B-dul Carol I, No. 11, 700506 Iasi, Romania
Department of Pharmacology & Toxicology, Queen's University, Kingston K7L 3N6, Canada
Al. I. Cuza' University Iasi, Faculty of Chemistry, B-dul Carol I, No. 11, 700506 Iasi, Romania The paper presents a non-isothermal kinetic study of the degradation process of some aromatic copolyethers containing a tetra-methylenic spacer. The polymers were synthesized using the phase transfer catalysis technique, starting from 1,4-dichlorobutane and various bisphenols (4,4'-dihidroxyazobenzene, 4,4'-dihydroxydiphenyl, bisphenol A and 2,7-dihydroxynaphthlene). Dynamic thermal analysis methods such as ATG, DTG and ATD were used. In order to work out the basic kinetic parameters and the reliance between activation energy and conversion degree, differential methods based on the `order reaction model' were applied and standard kinetic models were also used. The thermostability of the good samples up to 320°C was demonstrated. The degradation mechanism took place by successive reactions, controlled by a nucleation process influenced by the polymer molecular structure.
Key Words: Thermal behavior • thermal stability • aromatic copolyethers • kinetic parameters
This version was published on August
1, 2007 High Performance Polymers, Vol. 19, No. 4,
477-496 (2007) |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 |
|
|
 |
|
Sign In to gain access to subscriptions and/or personal tools.
