Polymer Bulletin, Vol.77, No.8, 4213-4234, 2020
Synthesis of a novel post-metallocene titanium complex of chelating [ONOO]-type ligand and studies on the effect of an extra donor arm on its reactivity in aqueous emulsion polymerization
In the present work, a new Ti complex LTiCl2{LH2 = 2-(3,5-di-tert-butyl-2-hydroxybenzylamino)-succinic acid}-bearing tetradentate [ONOO] donors has been synthesized and used in the homopolymerization of methyl methacrylate and styrene in aqueous emulsion. The effect of co-catalyst NaBPh(4)with ion-pair BPh4-was also studied on the catalytic activity. Moreover, synthesized complex has been characterized by(1)H NMR, UV-visible spectroscopy, infrared spectroscopy, high-resolution mass spectra and elemental analysis. The fabricated polymers have been tested using different characterizations, viz.H-1 NMR,C-13 NMR, DSC, DLS, XRD and GPC analysis. The GPC analysis reveals that polymer product obtained has high molecular weight, and the amorphous behavior of the polymer product was indicated by the XRD and DSC analysis. In addition to this, kinetic parameters like activation energy and rate constant for polymethyl methacrylate have also been examined.
Keywords:Non-metallocene catalyst;Early transition metal;Aqueous polymerization;Polymethyl methacrylate;Polystyrene