Investigation of effects of bis(2-hydroxyethyl) terephthalate derived from glycolysis of polyethylene terephthalate on the properties of flexible polyurethane foam

Hicham El Hatka, Youssef Hafidi, Najim Ittobane
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Abstract

This study investigated the potential of bis(2-hydroxyethyl) terephthalate (BHET), derived from the glycolysis of polyethylene terephthalate (PET) waste, as an additive in the synthesis of flexible polyurethane foam (FPUF), addressing the escalating environmental concerns associated with PET waste accumulation and the demand for sustainable material solutions. The influence of varying BHET content on the synthesis process, cellular architecture, and the intricate interplay between compositional variations and the resultant physical, mechanical, and thermal properties of FPUFs has been investigated. Our examination approach included analyses of foam density and cell morphology, comprehensive Fourier transform infrared (FTIR) spectroscopy for chemical structure elucidation, thermogravimetric analysis (TGA) to assess thermal stability, and differential scanning calorimetry (DSC) alongside mechanical property evaluations to discern the impact of BHET on foam performance metrics. Results emphasized the pivotal role of BHET in refining foam characteristics, where its inclusion facilitated the formation of foams with improvement in cell uniformity, subsequently affecting the foam’s apparent density. FTIR spectra analysis provided insight into the hydrogen bonding dynamics within polyurethane segments, revealing how BHET integration influenced microphase separation and the structural coherence of the material. The thermal and mechanical property assessments through TGA and mechanical testing demonstrated that the addition of BHET substantially augmented the thermal stability and mechanical performance of FPUFs.
研究聚对苯二甲酸乙二醇酯衍生的对苯二甲酸二(2-羟乙基)酯对软质聚氨酯泡沫性能的影响
本研究调查了聚对苯二甲酸乙二酯(BHET)作为添加剂用于合成软质聚氨酯泡沫(FPUF)的潜力,BHET 是由聚对苯二甲酸乙二醇酯(PET)废料的乙二醇化反应生成的,以解决与聚对苯二甲酸乙二醇酯(PET)废料积累相关的日益严重的环境问题和对可持续材料解决方案的需求。我们研究了不同 BHET 含量对合成工艺、蜂窝结构的影响,以及成分变化与 FPUF 的物理、机械和热性能之间错综复杂的相互作用。我们的研究方法包括泡沫密度和细胞形态分析、用于阐明化学结构的全面傅立叶变换红外(FTIR)光谱分析、用于评估热稳定性的热重分析(TGA)以及与机械性能评估同时进行的差示扫描量热法(DSC),以确定 BHET 对泡沫性能指标的影响。结果强调了 BHET 在完善泡沫特性方面的关键作用,加入 BHET 可促进泡沫的形成,改善泡孔的均匀性,进而影响泡沫的表观密度。傅立叶变换红外光谱分析深入揭示了聚氨酯片段内的氢键动态,揭示了 BHET 的加入如何影响材料的微相分离和结构一致性。通过热重分析和机械测试进行的热性能和机械性能评估表明,添加 BHET 大大提高了 FPUF 的热稳定性和机械性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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