Abstract
The growth of science and technology of polyurethanes leads to the development of new materials with more desirable properties. Modification of polyurethane (PU) by incorporating metal and functional groups are used extensively to improve various properties, such as enhanced thermal stability, fire retardancy, flexibility and solubility. In this investigation, a new metal-containing poly(urethane-semicarbazides) bearing a pyridine moiety have been synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), differential thermal analysis (DTA/TG) and tensile strength measurements. The results showed that the incorporation of metal ions into the polymer chain greatly influenced their mechanical and thermal properties. The tensile strength measurements on the PU films showed a marked difference in the elongation and tensile strength for compositions with various metal salts. The nature of the anion of the salt also affects the properties of the polymers, since the anions are able to form complexes with hydrogen atoms of urethane-semicarbazide PU segments. According to the results of DTA, introduction of metal ions leads to the increase of the thermal stability of metal-containing PU, as compared to the original PU. FTIR spectra data confirmed that the metal ions Cu2+, Co2+ are coordinated in the polymer metal chelates with hydrazide and urethane groups. The research results can be used to develop the new materials and methods for the preparation and designing of metal-containing polymers required in various areas, such as development of medical equipment, functional films and other related areas.
Highlights
NEW METAL-CONTAINING of metal ions on the mechanicalMetal-containing polymers represent a board classification of polymers with inorgan-POLY(URETHANE-SEMICARBAZIDES) ON THE BASIS OF PYRIDINE DERIVATIVES properties and the thermal degradation of metal-containing PU.ic salt groups attached to the Olena Kositsyna
This study is focused on the synthesis of the new poly(ure- were each separately dissolved in anhydrous DMF and added thane-semicarbazides) (PU) containing transition metal ions directly into the reaction mixture after adding of the DH soluand the hydrazide moiety
It should be noted that the introduction of metal salts into the macromolecule PU1, PU2 leads to an increase of the mechanical characteristics of polymers; the highest values of elongation and tensile strength were found for the sample PU1a (supposedly due to the stronger bond of Copper (II) salts with active polyurethane groups)
Summary
NEW METAL-CONTAINING of metal ions on the mechanicalMetal-containing polymers represent a board classification of polymers with inorgan-POLY(URETHANE-SEMICARBAZIDES) ON THE BASIS OF PYRIDINE DERIVATIVES properties and the thermal degradation of metal-containing PU.ic salt groups attached to the Olena Kositsyna. From the structural point of view, the organic ligands and second step, the MDI was dissolved in benzene, DH – in DMF; central metals play crucial factors in the coordination self-as- and into the solution of MDI – with stirring and in small porsembly process and final properties. Metal-containing polymers were obtained by the same method.
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