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首页> 外文期刊>Journal of Applied Polymer Science >Thermoplastic polyurethanes with isosorbide chain extender
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Thermoplastic polyurethanes with isosorbide chain extender

机译：带有异山梨醇扩链剂的热塑性聚氨酯

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摘要

Isosorbide, a renewable diol derived from starch, was used alone or in combination with butane diol (BD) as the chain extender in two series of thermoplastic polyurethanes (TPU) with 50 and 70% polytetramethylene ether glycol (PTMEG) soft segment concentration (SSC), respectively. In the synthesized TPUs, the hard segment composition was systematically varied in both series following BD/isosorbide molar ratios of 100 : 0; 75 : 25; 50 : 50; 25 : 75, and 0 : 100 to examine in detail the effect of chain extenders on properties of segmented polyurethane elastomers with different morphologies. We found that polyurethanes with 50% SSC were hard elastomers with Shore D hardness of around 50, which is consistent with assumed co-continuous morphology. Polymers with 70% SSC displayed lower Shore A hardness of 74-79 (Shore D around 25) as a result of globular hard domains dispersed in the soft matrix. Insertion of isosorbide increased rigidity, melting point and glass transition temperature of hard segments and tensile strength of elastomers with 50% SSC. These effects were weaker or non-existent in 70% SSC series due to the short hard segments and low content of isosorbide. We also found that the thermal stability was lowered by increasing isosorbide content in both series. (C) 2015 Wiley Periodicals, Inc.
机译：异山梨醇是一种衍生自淀粉的可再生二醇，可单独使用或与丁二醇（BD）结合用作增链剂，用于两种热塑性聚氨酯（TPU），分别具有50％和70％的聚四亚甲基醚二醇（PTMEG）软链段浓度（SSC） ）， 分别。在合成的TPU中，遵循BD /异山梨醇的摩尔比为100：0，两个系列中的硬链段组成都有系统地变化75：25; 50：50; 25:75和0：100，以详细检查扩链剂对具有不同形态的分段聚氨酯弹性体性能的影响。我们发现，具有50％SSC的聚氨酯是邵氏D硬度约为50的硬质弹性体，这与假定的共连续形态一致。由于球状硬质区域分散在软基质中，具有70％SSC的聚合物的肖氏A硬度较低，为74-79（邵氏D约为25）。异山梨酯的插入增加了硬段的刚性，熔点和玻璃化转变温度，并提高了含50％SSC的弹性体的拉伸强度。由于短的硬链段和异山梨醇含量低，在70％SSC系列中这些作用较弱或不存在。我们还发现通过增加两个系列中的异山梨醇含量降低了热稳定性。 （C）2015年Wiley Periodicals，Inc.

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