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11.
Liquid-Liquid
Phase Transfer Catalysis: Comparison of Kinetic Studies Involving
Free Radicals on Polymerization of Butyl Methacrylate
Yoganand. K. Sa, Sudhanandhini. Mb, Umapathy.
M. Ja*
aDepartment of Chemistry, College of Engineering Guindy, Anna
University Chennai, Chennai – 600 025, Tamil Nadu, India
bDepartment of S&H (Chemistry), R. M. D Engineering College,
Kavaraipettai, Chennai-601 206.
a Telephone: 044-22358669 a Email: mj_umapathy@yahoo.co.in
Abstract:
Kinetics and mechanism of the free radical polymerization of
butyl methacrylate (BMA), using potassium peroxomonosulfate (PMS)
/ potassium peroxodisulfate (PDS) as a water-soluble initiators
in the presence of 1, 4-bis (dimethylhexyl)ethylenediammonium
bromide (DMHEDB) as a phase-transfer catalyst (PTC), were
studied. The polymerization reactions were carried out under
inert and unstirred conditions at constant temperature of 60 ±
1° C in cyclohexanone / water biphasic medium. The rate of
polymerization (RP) increased with an increase in the
concentration of BMA, DMHEDB, initiators (PMS / PDS). The order
with respect to monomer, PTC and initiator was found to be 1.0.
RP was independent of the ionic strength and pH of the medium
and also the degree of polymerization is calculated by varying
the concentration of BMA. Based on the kinetic evidences a
suitable mechanism is proposed and also a comparison between the
two different initiators on rate of polymerization has been
studied.
Key words: Phase transfer catalyst · Free radical
polymerization · Kinetics · Mechanism
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