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首页> 外文期刊>Journal of Applied Polymer Science >Thermal and mechanical properties of multiple-component aliphatic degradable polyurethanes
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Thermal and mechanical properties of multiple-component aliphatic degradable polyurethanes

机译：多组分脂肪族可降解聚氨酯的热力学性能

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摘要

Macroscopic thermal and mechanical properties of complex aliphatic polycarbonate-based polyurethane (PU) films containing degradable ester units in PU backbone were studied by a combination of several experimental techniques. Differential scanning calorimetry (DSC) revealed that the synthesized oligomeric diol (DL-L) contributes (in addition to polycarbonate diol) to the formation of soft-segment domains, while the hard-segment domains are formed from 1,6-diisocyanatohexane (HDI) and butane-1,4-diol (BD). Three main phase transitions were detected by DSC and by dynamic mechanical thermal analysis. Thermogravimetric analysis (TGA) of two-component PUs showed that the PU made from DL-L and HDI is the least thermostable product, while the PU made from polycarbonate diol and HUT is the most stable one. The differences in the thermal stability of different four-component PUs are not important. Tensile properties very sensitively reflect the changes in composition and in microstructure of PU samples; the best tensile properties exhibits the degradable sample containing the equimolar ratio of hydroxyl groups of macrodiol, oligomeric diol DL-L. and butane-1,4-diol. (C) 2015 Wiley Periodicals, Inc.
机译：通过多种实验技术的组合研究了复杂的脂肪族聚碳酸酯基聚氨酯（PU）薄膜，其中PU骨架中含有可降解的酯单元，具有宏观的热力学性能。差示扫描量热法（DSC）显示，合成的低聚二醇（DL-L）有助于（除聚碳酸酯二醇外）形成软段结构域，而硬段结构域由1,6-二异氰酸根合己烷（HDI）形成）和1,4-丁二醇（BD）。 DSC和动态机械热分析检测到三个主要的相变。两组分PU的热重分析（TGA）表明，由DL-L和HDI制成的PU是最不稳定的产品，而由聚碳酸酯二醇和HUT制成的PU是最稳定的产品。不同的四组分PU的热稳定性的差异并不重要。拉伸性能非常灵敏地反映了聚氨酯样品的组成和微观结构的变化;最佳的拉伸性能显示出可降解的样品，其中包含大分子二醇，低聚二醇DL-L的羟基等摩尔比。和1,4-丁二醇。 （C）2015年Wiley Periodicals，Inc.

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