Synthesis, physical and chemical properties of polyetherurethanes modified
by natural antioxidant (in English)
Polimery 2006, No 1, 12
New polyetherurethanes (PEUR), modified by a-tocopherol (vitamin E) have been obtained. This natural antioxidant has been bounded with macromolecules as a chain branch, through ether linkage or through urethane group, using two kinds of synthesized monomers in PEUR preparation. The properties of modified PEUR have been compared with PEUR synthesized from the same basic substrates, only: poly(oxytetramethylene)glycol, 4,4'-methylene bis(cyclohexylene isocyanate) and 1,4-butanediol. Tensile strength, hardness and absorption of water and sunflower oil have been measured. The chemical stability of PEUR in Ringer's solution and in phosphate buffer (pH=7.4) has been investigated by measurements of weight loss at time to six weeks. Such investigation in water hydrogen peroxide solution (30 wt. %) and thermogravimetric analysis in air atmosphere and inspection of the changes of infrared spectra after isothermal oxidative ageing at 100°C have allowed to state that chemically bounded α-tocopherol improved the resistance of PEUR to oxidation.
Key words: modified polyetherurethanes, a-tocopherol, physical properties, thermooxidative resistance, chemical resistance
L. Jasińska, B. Masiulanis
Synthesis, physical and chemical properties of polyetherurethanes modified by natural antioxidant (in English)