INTERACTION OF DIVALENT METAL IONS WITH ISOTACTIC POLY(METHACRYLIC ACID).
INTERACTION OF DIVALENT METAL IONS WITH ISOTACTIC POLY(METHACRYLIC ACID).
No Thumbnail Available
Date
1977-06
Authors
BELLO, MOJI AFUSAT
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Isotactic polymethacrylic acid (PMA) has been prepared by
hydrolysing the isotactic polymethylmethacrylate (PMMA) which was
prepared from the monomer (MMA) using Grignard reagent initiator in
toluene. The most suitable method of hydrolysis was found to involve the
use of glacial acetic acid with para-toluene sulphonic acid as catalyst.
This method of hydrolysis resulted in complete hydrolysis.
The interaction between isotactic polymethacrylic acid (i-FMA)
and divalent metal ions has been studied at 25oC and varying experimental
conditions of ionic strength, degree of ionization, cation concentration
using two different techniques. The experimental techniques
used for these studies are equilibrium dialysis and potentiometric
titration techniques.
Results from the two methods of studies reveal that copper and
zinc interact quite strongly with preionized isotactic EMA while
magnesium only binds weakly. The binding strength of the ions has been
found to be Cu+2>Zn+2>-Mg+2.
Copper and zinc ions bind with i-PMA. to form complexes involving
two carboxylate groups to one metal ion.
The isotaotic PMA exists in compactly coiled state when unneutralised
and at very low degrees of ionization (alpha<0.25>). The unionized
acid was also found to be insolubleā¢ The ionized molecules undergo
configurational transition in the range alpha= 0.5 to 0.7.
In chapter 4 the binding of divalent metal ions with isotactic
PMA has been compared with that of conventional PMA using existing data.
It was found that both copper and zinc bind more to the isotactic PMA
than to conventional PMA.
Description
Thesis
Presented to the Ahmadu Bello University
for the Degree of Master of Science
in the Faculty of Science.
BY
MOJI AFUSAT BELLO (MRS.)
Department of Chemistry
Ahmadu Bello University
Zaria, Nigeria. JUNE, 1977.
Keywords
INTERACTION,, DIVALENT,, METAL,, IONS,, ISOTACTIC,, POTHACRYLIC ACID).POLY,