探索柔性聚氨酯泡沫配方中尿素硬段形态和相分离行为:水、氯化锂和异氰酸酯结构的影响

Hicham El Hatka, Y. Hafidi, N. Ittobane
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引用次数: 0

摘要

由于其独特的性能,柔性聚氨酯泡沫(fpuf)是用于各种应用的多功能材料。了解fpuf中的相分离行为对于根据特定应用定制其特性至关重要。在这项研究中,我们使用小角x射线散射(SAXS)、傅里叶变换红外光谱(FTIR)和广角x射线散射(WAXS)研究了不同尿素相连通性的fpuf。我们利用这些方法探讨了水、氯化锂和异氰酸酯结构对相分离行为的影响。FPUF配方中含水量的增加导致尿素形成量的增加和尿素团聚体的球形尺寸增大。将LiCl加入到FPUF配方中表明其能够阻止氢键的形成,从而导致尿素相的改变。此外,我们发现不对称二异氰酸酯制备的泡沫难以形成尿素相,而对称二异氰酸酯和脂肪族二异氰酸酯制备的泡沫容易形成尿素相。我们的研究揭示了尿素相的形态,硬段的包装性质,以及FPUFs的氢键行为。这些发现有助于更好地理解fpuf中的相分离,并为定制特定应用的特性提供见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring urea hard segment morphology and phase separation behavior in flexible polyurethane foam formulations: Water, lithium chloride and isocyanate structure effects
Flexible polyurethane foams (FPUFs) are versatile materials used in various applications due to their unique properties. Understanding the phase separation behavior in FPUFs is crucial for tailoring their properties to specific applications. In this study, we investigated FPUFs with varying levels of urea phase connectivity using small-angle X-ray scattering (SAXS), Fourier transform infrared spectroscopy (FTIR), and wide-angle X-ray scattering (WAXS). We explored the effect of water, lithium chloride, and isocyanate structures on the phase separation behavior by employing these methods. An increase in water content in the FPUF formulation resulted in a higher amount of formed urea and larger globular size of urea aggregates. Incorporating LiCl into FPUF formulations demonstrated its ability to prevent hydrogen bond formation, leading to alterations in the urea phase. Moreover, we found that foams prepared with asymmetric diisocyanates showed difficulty in forming the urea phase, while foams prepared with symmetric and aliphatic diisocyanates readily formed the urea phase. Our study sheds light on the morphology of the urea phase, the packaging nature of the hard segment, and the hydrogen bonding behavior of the FPUFs. These findings contribute to a better understanding of phase separation in FPUFs and offer insights into tailoring their properties for specific applications.
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