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. 2013 Sep 23:2013:958712.
doi: 10.1155/2013/958712. eCollection 2013.

Photoinitiated polymerization of 2-hydroxyethyl methacrylate by riboflavin/triethanolamine in aqueous solution: a kinetic study

Iqbal Ahmad  1 , Kefi Iqbal, Muhammad Ali Sheraz, Sofia Ahmed, Tania Mirza, Sadia Hafeez Kazi, Mohammad Aminuddin
Affiliations

Photoinitiated polymerization of 2-hydroxyethyl methacrylate by riboflavin/triethanolamine in aqueous solution: a kinetic study

Iqbal Ahmad et al. ISRN Pharm. .

Abstract

The polymerization of 1-3 M 2-hydroxyethyl methacrylate (HEMA) initiated by riboflavin/triethanolamine system has been studied in the pH range 6.0-9.0. An approximate measure of the kinetics of the reaction during the initial stages (~5% HEMA conversion) has been made to avoid the effect of any variations in the volume of the medium. The concentration of HEMA in polymerized solutions has been determined by a UV spectrophotometric method at 208 nm with a precision of ±3%. The initial rate of polymerization of HEMA follows apparent first-order kinetics and the rates increase with pH. This may be due to the presence of a labile proton on the hydroxyl group of HEMA. The second-order rate constants for the interaction of triethanolamine and HEMA lie in the range of 2.36 to 8.67 × 10(-2) M(-1) s(-1) at pH 6.0-9.0 suggesting an increased activity with pH. An increase in the viscosity of HEMA solutions from 1 M to 3 M leads to a decrease in the rate of polymerization probably as a result of the decrease in the reactivity of the flavin triplet state. The effect of pH and viscosity of the medium on the rate of reaction has been evaluated.

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Figures

Figure 1
Figure 1
Rate-pH profiles for the polymerization of HEMA in presence of RF/TEOHA. HEMA concentration: (⚫) 1.0 M, (■) 2.0 M, (▲) 3.0 M.
Figure 2
Figure 2
Plots of k 2 for the polymerization of HEMA (1–3 M) in presence of RF/TEOHA versus inverse of solution viscosity. Symbols are as in Figure 1.
Figure 3
Figure 3
Scheme for the polymerization of HEMA initiated by RF/TEOHA in aqueous solution.
See this image and copyright information in PMC

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