Synergistic effect of ultrasonication and phase transfer catalysts in radical polymerization of methyl methacrylate - A kinetic study.
Methyl methacrylate (MMA) has been polymerized to poly methyl methacrylate (PMMA) by employing three different phase transfer catalysts (PTC) such as 1,4-bis(dimethylhexyl)ethylenediammoniumbromide (DMHEDAB), 1,4bis(dimethylheptyl)ethylenediammoniumbromide (DMH1EDAB) and 1,4-bis(dimethyloctyl)ethylenediammonium bromide (DMOEDAB) under the influence of ultrasound radiation. The radical polymerization was performed under unstirred condition at a temperature of 60±1°C in an oxygen free atmosphere employing water soluble K2S2O8as initiator. Various parameters such as role of [Monomer], [Initiator], [PTC], solvent and temperature were investigated on rate of polymerization (Rp) and the synergic efficacy of ultrasound wave variation and phase transfer catalysts were also assessed. It was found that the rate of polymerization (Rp) increased drastically for all the three catalyst under the influence of ultrasound and the order of efficiency was found to be [Formula: see text] This increase may be due to the number of carbon chain attached to the polar group which facilitate and accelerate the rate of polymerization.
Department of Chemistry, College of Engineering, Anna University, Tamil Nadu, India. Electronic address: prabhaj78@gmail.com.
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Prabha
Department of Chemistry, College of Engineering, Anna University, Tamil Nadu, India. Electronic address: susanjemima@gmail.com.
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Susan Jemima
Department of Chemistry, College of Engineering, Anna University, Tamil Nadu, India. Electronic address: jprdmn@gmail.com.
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Jayaprada
Department of Chemistry, College of Engineering, Anna University, Tamil Nadu, India. Electronic address: mj_umapathy@yahoo.co.in.
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MJ
Umapathy
Free radical polymerization; Methyl methacrylate; Ultrasound and quaternary ammonium salts