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Synthesis,physical and chemical properties of polyetherurethanes modified by natural antioxidant

机译:天然抗氧化剂改性聚醚氨基甲酸酯的合成,理化性质

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New polyetherurethanes (PEUR),modified by alpha-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 deg C have allowed to state that chemically bounded alpha-tocopherol improved the resistance of PEUR to oxidation.
机译:获得了一种由α-生育酚(维生素E)改性的新型聚醚氨基甲酸酯(PEUR)。这种天然抗氧化剂已通过醚键或氨基甲酸酯基团与大分子作为链分支结合,在PEUR制备中使用两种合成单体。将改性的PEUR的性能与在相同的基本底物上合成的PEUR进行了比较,仅:聚(氧四亚甲基)二醇,4,4'-亚甲基双(环己烯异氰酸酯)和1,4-丁二醇。拉伸强度,硬度和吸收测量了水和葵花籽油。通过测量六周时间的重量损失,研究了REUR在林格溶液和磷酸盐缓冲液(pH = 7.4)中的化学稳定性。在过氧化氢水溶液(30 wt。 %)和在空气中的热重分析以及在100摄氏度下等温氧化老化后检查红外光谱的变化,可以说明该化学键合了α-生育酚rol提高了PEUR的抗氧化性。

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