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NEW PERFLUOROPOLYETHER SOFT SEGMENT CONTAINING POLYURETHANES

机译:包含聚氨酯的新型全氟橡胶软段

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New segmented polyurethanes (FPU) with perfluoropolyether (PFPE) blocks have been synthesized by a two-step process. In the first step, a fluorinated isocyanate end-capped prepolymer has been obtained by reaction of a fluorinated macrodiol with alicyclic diisocyanates in the presence of solvent. The following chain extension has been carried out by reaction of the prepolymer with short hydrogenated polyols giving a polymeric matrix. Tensile properties, dynamical-mechanical (DMA), and calorimetric (DSC) analyses have been evaluated, and relationships between chemical structure and final properties are established. These polymers show unusual low-temperature elastomeric behavior, due to the low glass transition (T-g) of the continuous fluorinated phase. In general, with respect to traditional polyurethanes (HPU), thermal stability and chemical resistance are strongly improved by the effect of the highly inert fluorinated chains. (C) 1995 John Wiley and Sons, Inc. [References: 27]
机译:具有全氟聚醚(PFPE)嵌段的新型分段聚氨酯(FPU)已通过两步过程合成。在第一步中,通过在溶剂存在下使氟化大分子二醇与脂环族二异氰酸酯反应,获得了氟化异氰酸酯封端的预聚物。通过使预聚物与短的氢化多元醇反应得到聚合物基质,进行了以下扩链。评估了拉伸性能,动态力学(DMA)和量热分析(DSC),并建立了化学结构与最终性能之间的关系。由于连续氟化相的低玻璃化转变温度(T-g),这些聚合物表现出不同寻常的低温弹性行为。通常,相对于传统聚氨酯(HPU),高度惰性的氟化链的作用可大大提高热稳定性和耐化学性。 (C)1995 John Wiley and Sons,Inc. [参考:27]

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