Kinetics of Polymerization of 2-Hydroxyethylmethacrylate Initiated by a Titanium(III)-Dimethylglyoxime Redox System

Kalappa PRASHANTHA; Karkala Vasanth Kumar PAI

Makale detayları

Kinetics of Polymerization of 2-Hydroxyethylmethacrylate Initiated by a Titanium(III)-Dimethylglyoxime Redox System

Yazarlar:

Kalappa PRASHANTHA | Karkala Vasanth Kumar PAI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2003 Vol.27 Issue 1, pp.99-110

Belge Tipi:

Makale

Yayın Tarihi:

12/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000729688

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

The polymerization of 2-hydroxyethylmethacrylate (HEMA)  initiated by the redox system titanium(III)-dimethyl glyoxime (DMG)  was studied in dimethyl formamide (DMF)-water (80:20 v/v) medium in  the temperature range 290-310 K. The rate of polymerization (Rp)  was investigated at various concentrations of reductant, oxidant,  sulfuric acid, and monomer.  Cyclic voltametric sensing of  dimethylglyoxime under the kinetic conditions demonstrated its  reduction behavior.  From the obtained results, it was inferred that  the polymerization reaction was initiated by an organic free radical  arising from the titanium(III)-dimethylglyoxime redox system.  Chain  termination of the polymer took place predominantly by mutual coupling  and small fraction by chain transfer mechanism involving solvent  molecules.  The effects of some water miscible organic solvents and  surfactants on the rate of polymerization were investigated.  The  temperature dependence of the rate was studied and the activation  parameters were computed using Arrhenius and Eyring plots.  A suitable  kinetic scheme is proposed on the basis of experimental observations.

 

The polymerization of 2-hydroxyethylmethacrylate (HEMA)  initiated by the redox system titanium(III)-dimethyl glyoxime (DMG)  was studied in dimethyl formamide (DMF)-water (80:20 v/v) medium in  the temperature range 290-310 K. The rate of polymerization (Rp)  was investigated at various concentrations of reductant, oxidant,  sulfuric acid, and monomer.  Cyclic voltametric sensing of  dimethylglyoxime under the kinetic conditions demonstrated its  reduction behavior.  From the obtained results, it was inferred that  the polymerization reaction was initiated by an organic free radical  arising from the titanium(III)-dimethylglyoxime redox system.  Chain  termination of the polymer took place predominantly by mutual coupling  and small fraction by chain transfer mechanism involving solvent  molecules.  The effects of some water miscible organic solvents and  surfactants on the rate of polymerization were investigated.  The  temperature dependence of the rate was studied and the activation  parameters were computed using Arrhenius and Eyring plots.  A suitable  kinetic scheme is proposed on the basis of experimental observations.

Makale detayları

Kinetics of Polymerization of 2-Hydroxyethylmethacrylate Initiated by a Titanium(III)-Dimethylglyoxime Redox System

Yazarlar: Kalappa PRASHANTHA | Karkala Vasanth Kumar PAI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2003 Vol.27 Issue 1, pp.99-110

Belge Tipi: Makale

Yayın Tarihi: 12/2002

Belge Dili: Türkçe

Document ID (Org No.): 2000729688

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Kalappa PRASHANTHA | Karkala Vasanth Kumar PAI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2003 Vol.27 Issue 1, pp.99-110

Belge Tipi:

Makale

Yayın Tarihi:

12/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000729688

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527