Abstract
The reaction of isophthaloyl dichloride with 1H-1,2,4-triazole afforded the new ligand 1,3-phenylenebis(1,2,4-triazole-1-yl)methanone (1). A series of Co(II), Cu(II), Zn(II) and Ni(II) complexes were synthesized using 1 and then characterized by melting point analysis, elemental analysis, theoretical calculations, thermogravimetric analysis, X-ray powder diffraction, nuclear magnetic resonance, infrared and Raman spectroscopy. Experimental and computational studies predict the formation of coordination polymers (CPs). The cobalt and copper CPs and zinc(II) complex were found to be good initiators for the ring-opening polymerization of ε-caprolactone (CL) under solvent-free conditions. 1H-NMR analysis showed that the obtained polymers of CL were mainly linear and had terminal hydroxymethylene groups. Differential scanning calorimetry showed that the obtained polycaprolactones had high crystallinity, and TGA showed that they had decomposition temperatures above 400 °C. These results provide insight and guidance for the design of metal complexes with potential applications in the polymerization of CL.
Highlights
Many researchers have focused on the synthesis of biodegradable polymers as there is great interest in designing environmentally friendly materials [1]
Other metal catalysts used for the ring-opening polymerization (ROP) of CL require initiators, which makes polymerization reactions more complex and expensive [8,9]
The Thermogravimetric analyses (TGA) and Differential scanning calorimetry (DSC) results from the PCL product showed that these materials have potential applications in the design of biodegradable packaging
Summary
Many researchers have focused on the synthesis of biodegradable polymers as there is great interest in designing environmentally friendly materials [1]. PCL is typically produced by the ring-opening polymerization of ε-caprolactone (CL) catalyzed by metal complexes [4,5,6,7]. Other metal catalysts used for the ring-opening polymerization (ROP) of CL require initiators, which makes polymerization reactions more complex and expensive [8,9]. We have reported the synthesis, characterization and application of context, PCL catalysts using zinc and with adequate catalyst loading and at moderate temperatures. In this we have reported the chromium cations. The ROP was carried out solvent-free with a monomer-complex synthesis, characterization and application of under. PCL was with highly crystalline (61%)ratio andofhad decomposition was out under solvent-free conditions a monomer-complex.
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