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首页> 外文期刊>Iranian polymer journal >Novel thermoplastic natural rubber based on thermoplastic polyurethane blends: influence of modified natural rubbers on properties of the blends
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Novel thermoplastic natural rubber based on thermoplastic polyurethane blends: influence of modified natural rubbers on properties of the blends

机译：基于热塑性聚氨酯共混物的新型热塑性天然橡胶：改性天然橡胶对共混物性能的影响

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摘要

Three different forms of natural rubber: mal-eated natural rubber (MNR), epoxidized natural rubber (ENR) and natural rubber-graft-poly(methyl methacrylate) (NR-g-PMMA) were prepared. Degree of functional groups in rubber molecules was quantified using the integrated peak areas of JH NMR. It was found that the modified rubbers with similar level of functionality had been successfully prepared. Thermoplastic natural rubber (TPNR) based on blending of thermoplastic polyurethane (TPU) and various forms of rubber were then prepared using melt blending method. The properties of the blends were studied and compared together in relation to different types of natural rubbers prepared (i.e., unmodified NR, MNR, ENR and NR-g-PMMA). It was found that the blends with modified NR exhibited superior stiffness, entropy effect and damping factor compared to other blends with unmodified NR. This is attributed to the chemical interaction between the functional groups of modified NR molecules and polar functional groups in TPU molecules which facilitated higher interfacial adhesion between both phases. The chemical interaction was verified by ATR-FTIR and TSSR techniques. It was also found that the MNR/TPU blend showed the highest tensile modulus, mechanical and elastic properties with smallest and finer grain dispersion of co-continuous phase compared to ENR/ TPU, NR-g-PMMA/TPU and unmodified NR/TPU blends, respectively. This might be due to higher chemical interactions between MNR and TPU phases. Furthermore, the incorporation of rubber did reduce hardness (i.e., <60 Shore A) with improvement of elasticity of the blends compared with the original TPU (i.e., ～85 Shore A).
机译：制备了三种不同形式的天然橡胶：不良反应天然橡胶（MNR），环氧化天然橡胶（ENR）和天然橡胶接枝聚甲基丙烯酸甲酯（NR-g-PMMA）。橡胶分子中官能团的程度使用1H NMR积分峰面积进行定量。发现已经成功制备了具有相似功能水平的改性橡胶。然后采用熔融共混法制备了基于热塑性聚氨酯（TPU）和各种形式橡胶的热塑性天然橡胶（TPNR）。研究了共混物的性能，并与所制备的不同类型的天然橡胶（即未改性的NR，MNR，ENR和NR-g-PMMA）进行了比较。发现与未改性NR的其他共混物相比，具有改性NR的共混物表现出优异的劲度，熵效和阻尼因子。这归因于修饰的NR分子的官能团和TPU分子中的极性官能团之间的化学相互作用，其促进了两个相之间的更高的界面粘附。通过ATR-FTIR和TSSR技术验证了化学相互作用。还发现，与ENR / TPU，NR-g-PMMA / TPU和未改性的NR / TPU共混物相比，MNR / TPU共混物显示出最高的拉伸模量，机械和弹性性能，共连续相的晶粒分散度最小且更细， 分别。这可能是由于MNR和TPU相之间较高的化学相互作用。此外，与原始TPU（〜85 Shore A）相比，掺入橡胶确实降低了硬度（即<60 Shore A），并改善了共混物的弹性。

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  • 来源
    《Iranian polymer journal》 |2012年第10期|p.689-700|共12页
  • 作者

    Ekvipoo Kalkornsurapranee; Norbert Vennemann; Claudia Kummerloewe; Charoen Nakason;

  • 作者单位

    Center of Excellence in Natural Rubber Technology,Department of Rubber Technology and Polymer Science,Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand;

    Faculty of Engineering and Computer Science,University of Applied Sciences of Osnabrueck,Albrechtstr. 30, 49076 Osnabriick, Germany;

    Faculty of Engineering and Computer Science,University of Applied Sciences of Osnabrueck,Albrechtstr. 30, 49076 Osnabriick, Germany;

    Center of Excellence in Natural Rubber Technology,Department of Rubber Technology and Polymer Science,Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand;

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  • 关键词

    maleated natural rubber; epoxidized natural rubber; natural rubber-g-poly(methyl methacrylate); thermoplastic natural rubber;

    机译：马来酸天然橡胶;环氧化天然橡胶;天然橡胶-g-聚（甲基丙烯酸甲酯）;热塑性天然橡胶;

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