International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
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One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
KINETIC STUDY OF POLYMERIZATION OF METHYL METHACRYLATE INITIATED BY Ce(IV) – VANILLIN REDOX SYSTEM IN THE PRESENCE βCD AND MICELLAR PHASE C.Kumaresan1, M.C. Duraimanickam2 1Department
of Chemistry,Arulmigu Palaniandavar College of Arts & Culture, Palani 624601. Email : kumaresanc91@ gmail.com 2Department of Chemistry,Arulmigu Palaniandavar College of Arts & Culture, Palani 624601. Email : mcduraimanickam63 @ yahoo.com ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract: Kinetics of Polymerization of methylmethacrylate as Aldomet, L-Dopa[13] and Trimethaprin 2A. It is also used (MMA) initiated by Ce(IV) – Vanillin redox system have been in the preparation of perfume and as a catalyst to carried out at two different temperatures 30oC & 36oC in dilute polymerize methyl methacrylates [14] .Vanillin (3-methoxysulfuric acid medium under nitrogen atmosphere. The rate of 1-hydroxy benzaldehyde) has both phenolic and aldehyde oxidation of Vanillin by Ce (IV) in the presence and absence of groups and its capable of undergoing three different types of monomer were studied. The effect of various concentrations of reaction those of the aldehyde groups the phenolic hydroxyl monomer [MMA], oxidant [Ce(IV)], reductant [vanillin], and the aromatic nucleus. The aldehydic group undergoes medium [H+] and varying ionic strengths NaHSO4 on the rate condensation15reaction that allows substitution[16] for the of polymerization, rate of Ce(IV) consumption (-RCe) and the aldehyde reactions, likes Cannizaro’s reaction. If the percentage monomer conversion were examined. Further, the hydroxyl group in vanillin is protected, Aldehyde group rate of polymerization (Rp) in β-CD and miceller (SLS, CTAB undergoes oxidation[17] to vanillin acid. A direct oxidation and Tx-100) phase at constant concentration has been mechanism, without complex formation has been suggested investigated. The kinetic study of Michelis-menton mechanism for oxidation in sulfuric acid[18,19]. The kinetics of for the formation of intermediate complex between reactants polymerization of MMA with Ce(IV) and vanillin has been allows the oxidation data to be calculated from the plot of Line reported[20] The literature survey reveals that no reports of Weaver-Burk. The varying rate and thermodynamic the kinetics of polymerization of MMA with Ce(IV) - vanillin parameters were studied by Arrhenius and Eyring plot. The in β-CD and micellar phase has been carried out. rate of polymerization can be calculated. A suitable mechanism has been proposed based on the experimental 2. EXPERIMENTAL METHODS results. The polymerization was carried out in a pyrex tube Key words : MMA-methylmethacrylate, β-CD-Betaof 150 ml capacity which was sealed at the bottom and the cyclodextrin, Ce(IV) –cericammoniumsulphate, SLStop was fitted with a standard joint stopper having inlet and Sodium lauryl sulphate, CTAB-cetyltrimethyl ammonium outlet tubes for the passage of nitrogen. A micro burette was bromide Tx-100- Triton-X-100 fitted vertically on the stopper the aqueous solutions of MMA, vanillin and sulfuric acid, sodium bisulfate (to 1. INTRODUCTION maintain ionic strength) and SDS in appropriate concentrations were taken on the reaction tube. Nitrogen Kinetic studies on aqueous polymerization of MMA gas was bubbled for about half an hour. The solution was have been reported[1,2]. Several reports have appeared on thermo stated to attain desired temperature followed by the mechanism and kinetics of vinyl polymerization initiated addition of Ce(IV) solution from the micro burette and by variety of initiators[3-6]. Ceric ion has been widely used mixing by shaking. The volume of reaction mixture was in vinyl polymerization in the presence of various organic adjusted to 20 ml. The polymerization started immediately reducing agents such as alcohols[7], acids[8], amides[9], after the addition of Ce(IV) solution. After a definite interval amines[10],etc. Rout et al[11] have proposed a linear of time the reaction was quenched by addition of the excess termination step involving interaction of monomer radicals standard ferrous ammonium sulfate solution. The filtrate with ceric ion[12]. Vanillin is a very powerful flavoring along with washing after separation of polymer was reagent in the food industry and widely used in the synthesis estimated for residual Ce(IV) by titrating with standard of drugs, 40% of vanillin is consumed in manufacturing drug Ce(IV) using ferroin indicator. The rate of polymerization
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