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首页> 外文期刊>RSC Advances >Synthesis and properties of polyurethane urea with pyridine-2,6-dicarboxamide moieties in their structure
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Synthesis and properties of polyurethane urea with pyridine-2,6-dicarboxamide moieties in their structure

机译：聚氨酯尿布与吡啶-2,6-二氨基酰胺部分的合成与性能

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摘要

The synthesis of new heterocyclic polyurethane materials is an attractive way to study structure-property relationships. In this work we report on the introduction of 2,6-pyridinedicarboxamide into the main chains of linear and crosslinked polyurethanes. These materials were synthesized using the same soft block (Terathane 1400) and different hard blocks via a two-step polymerization method. The FTIR spectra indicated that the inclusion of pyridine derivative into polyurethane urea chain structure had been successful. The obtained polyurethane matrix structure was characterized through fewer specific intermolecular hydrogen bonds between the pyridine units, urethane and amide groups, due to the fact that the 2,6-pyridinedicarboxamide units are likely to adopt syn-syn conformations when in solid state. These heterocyclic polyurethanes also exhibit improved thermal stability (as measured by TGA) compared with conventional polyurethanes. Stress-strain curves show that the tensile strength and elongation at break are higher in the case of crosslinked samples. The properties of the linear heterocyclic polyurethanes were all compared to the properties of the crosslinked heterocyclic polyurethanes.
机译：的新杂环聚氨酯材料的合成是一个有吸引力的方式来研究结构 - 性能关系。在这项工作中，我们在引进2,6吡啶二甲成线性和交联聚氨酯的主链报告。这些材料是通过两步聚合方法，使用相同的软嵌段（1400的Terathane）和不同的硬嵌段合成。 FTIR谱表明，该夹杂物的吡啶衍生物的成聚氨酯脲链结构取得了成功。将所得到的聚氨酯基质结构表征通过吡啶单元，氨基甲酸酯和酰胺基团之间更少的特定分子间氢键，由于这样的事实，所述2,6-吡啶二甲酰胺单元可能采用顺式 - 顺式构象在固态时。与常规的聚氨酯相比，这些杂环聚氨酯还表现出改善的热稳定性（如通过TGA测定）。应力 - 应变曲线表明，拉伸强度和断裂伸长率是在交联样品的情况下更高。线性杂环聚氨酯的性能都较交联杂环聚氨酯的性能。

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  • 来源
    《RSC Advances》 |2016年第108期|共10页
  • 作者

    Oprea S.; Potolinca V. O.; Varganici C. -D.;

  • 作者单位

    Petru Poni Inst Macromol Chem Aleea Grigore Ghica Voda 41-A Iasi 700487 Romania;

    Petru Poni Inst Macromol Chem Aleea Grigore Ghica Voda 41-A Iasi 700487 Romania;

    Petru Poni Inst Macromol Chem Aleea Grigore Ghica Voda 41-A Iasi 700487 Romania;

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  • 正文语种 eng
  • 中图分类 化学;
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