14-12-2025
جامعة الملك عبدالعزيز
KING ABDULAZIZ UNIVERSITY
Faculty of Sciences
Document Details
Document Type
:
Article In Journal
Document Title
:
Kinetics of permanganate oxidation of synthetic macromolecule poly(vinyl alcohol)
Kinetics of permanganate oxidation of synthetic macromolecule poly(vinyl alcohol)
Subject
:
Chemistry
Document Language
:
English
Abstract
:
Oxidation of poly(vinyl alcohol) (PVA) by permanganate has been studied spectrophotometrically at 525 and 420nm. Under pseudo-first order conditions ([PVA] > [MnO4]), the reaction rate increases with [PVA] and the kinetics reveals complex order dependences [PVA]. The second-order kinetics with respect to [H2S04] at low concentration shifts to first- order at higher concentration. Water soluble colloidal Mn02 has been identified as an intermediate in the reduction of Mn04" by PVA. The hydrogen ions decrease the stability of colloidal Mn02. Poly(vinyl ketone) is found to be the final oxidation product of PVA. Inorganic electrolytes like NaF, Na4P207 and MnCI 2 (a product of the reaction), have inhibitory and · composite effects (inhibition and catalysis) on the reaction rate. Arrhenius and Eyring equations have been used to evaluate the activation parameters. The observed results are discussed in terms of Michaelis-Menten kinetic model. A mechanism has been proposed on the basis of experimental findings.
ISSN
:
0376-4710
Journal Name
:
Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
Volume
:
48
Issue Number
:
2
Publishing Year
:
2009 AH
2009 AD
Number Of Pages
:
5
Article Type
:
Article
Added Date
:
Wednesday, October 14, 2009
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
Malik, M.A
Malik, M.A
Researcher
Doctorate
Ilyas, M
Ilyas, M
Researcher
Doctorate
ظهير خان
Khan, Z.H
Researcher
Doctorate
drkhanchem@yahoo.com
Files
File Name
Type
Description
23443.pdf
pdf
Abstract
Back To Researches Page