Microwave radiation copolymerization of dibutyltin maleate and allyl thiourea

This article reports on an investigation of microwave radiation copolymeriz ation of dibutyltin maleate (DBTM) with allyl thiourea (AT) and the copolym ers it produced. The effect of radiation energy, composition of monomer, am ount of initiator, and amount and kind of inorganic oxide (Al2O3, or SiO2) as reaction sensitizers on the copolymerization conversion and polymer-inhe rent viscosity were systematically studied, and simultaneously compared wit h the relevant conventional thermopolymerization. The reactivity ratios for DBTM and AT were determined using liquid chromatography. The copolymerizat ion mechanism of microwave radiation was probed using a free-radical captur ing agent (DPPH). The copolymers obtained were used as heat-stabilization a gent of PVC resin. (C) 2000 John Wiley & Sons, Inc.