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Microstructure and properties of polyurethanes derived from castor oil

机译：蓖麻油衍生的聚氨酯的微观结构和性能

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摘要

The goal of this work was the synthesis of novel segmented polyurethanes with a high percentage of components derived from renewable sources. The soft segment was a polyol derived from castor oil and the hard segment structure was varied by means of different chain extenders, petrochemical-based 1,4-butanediol (BD) and corn sugar-based 1,3-propanediol (PD). The synthesis was carried out in bulk and without catalyst via a two-step polymerization varying hard segment ratio. Physico-chemical, mechanical and morphological characterization was performed by Fourier transform infrared spectros-copy (FTIR), differential scanning calorimetry (DSC), atomic force microscopy (AFM), mechanical testing and termogravimetric analysis (TGA). Properties have been discussed from the viewpoint of hard/soft microdomain phase separation and also the hard segment nature and formed structure. An increase in hard segment content was accompanied by an increase in hard domain order, crystallinity, and stiffness. The hard segment structures, in addition to the elastic nature of soft segment, provide enough physical crosslink sites to impart properties ranging from elastomeric to rigid behaviour with the increase of hard segment content. Polyurethanes synthesized from bio-based chain extender showed a slightly lower crystallinity in the hard segment structure than that synthesized from BD as the chain extender. This lower crystallinity avoids strength concentrations at the soft/crystalline hard segment interface, thus improving the mechanical properties at high hard segment content. The slightly higher thermal stability observed for BD based polyurethanes is related with their more packed structures and crystallinity observed in the hard segment structure.
机译：这项工作的目标是合成具有高比例可再生资源成分的新型分段聚氨酯。软链段是衍生自蓖麻油的多元醇，硬链段的结构通过不同的扩链剂，基于石化的1,4-丁二醇（BD）和基于玉米糖的1,3-丙二醇（PD）来改变。通过改变硬链段比例的两步聚合反应，在没有催化剂的情况下进行了本体合成。通过傅立叶变换红外光谱（FTIR），差示扫描量热法（DSC），原子力显微镜（AFM），机械测试和热重分析（TGA）进行理化，机械和形态表征。已经从硬/软微区相分离以及硬链段性质和形成的结构的角度讨论了性质。硬链段含量的增加伴随着硬畴顺序，结晶度和刚度的增加。硬链段结构，除了软链段的弹性外，还提供了足够的物理交联位点，以随着硬链段含量的增加赋予从弹性到刚性的各种性能。由生物基扩链剂合成的聚氨酯在硬链段结构中的结晶度比由BD作为扩链剂合成的聚氨酯略低。这种较低的结晶度避免了在软/结晶硬链段界面处的强度集中，从而提高了高硬链段含量下的机械性能。对于BD基聚氨酯，观察到的热稳定性稍高，这与它们在硬链段结构中观察到的更堆积的结构和结晶度有关。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第11期|p.2175-2184|共10页
  • 作者

    M.A. Corcuera; L. Rueda; B. Fernandez dArlas; A. Arbelaiz; C. Marieta; I. Mondragon; A. Eceiza;

  • 作者单位

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

    Materials + Technologies' Group, Universidad Pais Vasco/Euskal Herriko Unib, Departamento de Ingenieria Qulmica y Medio Ambiente, Escuela Politecnica,Pza Europa I, 20018 Donostia-San Sebastian, Spain;

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  • 正文语种 eng
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  • 关键词

    polyurethane; castor oil-polyol; corn sugar bases chain extender; mechanical properties; thermal stability;

    机译：聚氨酯蓖麻油多元醇;玉米糖基扩链剂;机械性能热稳定性;

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