Synthesis of new methacrylic monomers on the basis of pyrazole derivatives for thermal stabilization of polystyrene

	O.Otsalyuk, N. Iukhymenko, A. Kolendo
Faculty of Chemistry, Macromolecular Chemistry Department, Taras Shevchenko National University of Kyiv, Kyiv, 01033, 60 Volodymyrska Street, Ukraine. 
e-mail: yukhimenko.n@gmail.com

The development of modern technologies causes the problem of creating new polymer materials with desired properties. One of the pressing problems of modern polymer chemistry is the creation of "smart" polymers. Researching in the field of aging and stabilization of polymers, in particular polystyrene (PS), which is widely used in various industrial applications, is an actual task. The production of monomers, in particular methacrylic esters, on the basis of pirazoles, opens up the prospect of the creation of polymers with PS-like properties, but with the significantly reduced time of destruction of the polymer product. 

 	Destruction of modified polystyrene was studied using Derivatographic measurements. The figure shows the thermogravimetric (TG) curves of degradation of radical polystyrene wich was obtained by the reaction of copolymerization, industrial Swiss polystyrene (Styron) and polystyrene + 3% of residues of (1-methyl-1H-pyrazol-5-yl)methyl methacrylate by heating with the rate of 10 deg / min.
 	Analyzing thermodegradation curves it can be stated that the application (1H-pyrazol-1-yl) methyl methacrylate will slow down the initial stage of degradation and inhibition of the procedural functions of polystyrene as a whole (T20% degradation is 48 ° higher than that of Styrene), but the latter begins to decompose 20 ° lower than non-sterile.