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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of novel natural rubber based cationic waterborne polyurethaneEffect of emulsifier and diol class chain extender
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Synthesis and characterization of novel natural rubber based cationic waterborne polyurethaneEffect of emulsifier and diol class chain extender

机译：新型天然橡胶基阳离子水性聚氨酯聚氨酯聚氨酯与二醇级链增量剂的合成与表征

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摘要

Novel cationic waterborne polyurethanes (cWPU) were synthesized by step-growth polymerization of hydroxyl telechelic natural rubber, molecular weight of 2800 gmol(-1), toluene-2,4-diisocyanate, N-methyl diethanolamine (NMDEA) as an emulsifier. The chemical structure of cWPU was confirmed by H-1-nuclear magnetic resonance and Fourier transform infrared spectroscopy. The amounts of NMDEA and ethylene glycol under isocyanate (NCO) index of 100 on the properties of cWPU were studied. It was found that cWPU was stable under the concentration of NMDEA more than 1.50 mol and the particle sizes decreased with increasing of NMDEA content. Also, contact angle shows more hydrophilic materials by increasing of NMDEA. Extended cWPU was found in two ranges of nano size. Chain extender has strongly affected cWPU film formation, increasing of mechanical properties, and thermal properties. In addition, stress-strain curve and scanning electron microscopy image shows the change of behavior from soft elastic to ductile plastic by adding ethylene glycol. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45715.
机译：通过羟基伸缩天然橡胶，2800gmol（-1），甲苯-2,4-二异氰酸酯，N-甲基二乙醇胺（NMDEA）作为乳化剂，合成了新的阳离子水性聚氨酯（CWPU）合成了合成的。 H-1核磁共振和傅里叶变换红外光谱证实了CWPU的化学结构。研究了NMDEA和乙二醇的量为100℃的异氰酸酯（NCO）指数上的含量下的CWPU性能。发现CWPU在NMDEA的浓度下稳定，超过1.50摩尔，随着NMDEA含量的增加而降低。此外，接触角通过增加NMDEA显示出更多的亲水材料。扩展的CWPU在两个纳米尺寸范围内被发现。链增量器强烈影响CWPU成膜，增加力学性能和热性能。此外，应力 - 应变曲线和扫描电子显微镜图像显示通过加入乙二醇从软弹性到延展性塑料的变化。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45715。

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