Improved thermal stability and flame-retardant performance of rigid polyurethane foam modified by hydrolyzed keratin-modified polyol and aluminium hypophosphite

IF 2.9 4区化学 Q2 POLYMER SCIENCE Polymer International Pub Date : 2024-01-31 DOI:10.1002/pi.6616

Xu Zhang, Jianwei Wang, Simiao Sun, Chen Xu, Zhi Wang, Hua Xie

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Abstract

Rigid polyurethane foam (RPUF) was prepared using hydrolyzed keratin-modified polyol and aluminium hypophosphite as flame retardants. The effects of aluminium hypophosphite on the thermal stability and flame-retardant properties of hydrolyzed keratin-modified RPUFs were studied by limiting oxygen index (LOI) method, thermogravimetric analysis, pyrolysis kinetic analysis, cone analysis and smoke density analysis. The results showed that RPUF added with 7.5 wt% aluminium hypophosphite (RPUF-HK5-7.5AL) had the highest LOI, which was 26.1%. RPUF-HK5-7.5AL had the highest initial decomposition temperature, the highest T_5% at a heating rate of 10 °C min⁻¹ and the highest activation energy. In addition, RPUF-HK5-7.5AL possessed the lowest heat release rate at 50 kW m⁻² of 125.10 kW m⁻², and the lowest total heat release rate of 5.30 MJ m⁻². Results indicated that RPUF-HK5-7.5AL had the best thermal stability and flame-retardant properties. Scanning electron microscopy showed that hydrolyzed keratin and aluminium hypophosphite had a synergistic effect on the flame retardancy of the RPUFs. The current research results provide a useful reference for the preparation of RPUFs with good flame-retardant properties by bio-based modification. © 2024 Society of Industrial Chemistry.

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用水解角蛋白改性多元醇和次磷酸铝改性的硬质聚氨酯泡沫的热稳定性和阻燃性能得到改善

用水解角蛋白改性多元醇和次磷酸铝作为阻燃剂制备了硬质聚氨酯泡沫（RPUF）。通过极限氧指数（LOI）法、热重分析、热解动力学分析、锥体分析和烟密度分析（Ds）研究了次磷酸铝对水解角蛋白改性 RPUF 热稳定性和阻燃性能的影响。结果表明，添加了 7.5 wt%次磷酸铝的 RPUF（RPUF-HK5-7.5AL）的 LOI 最高，为 26.1%。RPUF-HK5-7.5AL 的初始分解温度最高，加热速率最高（10°C/min T5%），活化能最高。此外，RPUF-HK5-7.5AL 在 50 kW/m2 时的放热率最低，为 125.10 kW/m2，总放热率最低，为 5.30 MJ/m2。这表明 RPUF-HK5-7.5AL 具有最佳的热稳定性和阻燃性能。扫描电镜显示，水解角蛋白和次磷酸铝对 RPUF 的阻燃性有协同作用。本研究成果为通过生物基改性制备具有良好阻燃性能的 RPUFs 提供了有益的参考。

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来源期刊

Polymer International 化学-高分子科学

CiteScore

7.10

自引率

3.10%

发文量

135

审稿时长

4.3 months

期刊介绍： Polymer International (PI) publishes the most significant advances in macromolecular science and technology. PI especially welcomes research papers that address applications that fall within the broad headings Energy and Electronics, Biomedical Studies, and Water, Environment and Sustainability. The Journal’s editors have identified these as the major challenges facing polymer scientists worldwide. The Journal also publishes invited Review, Mini-review and Perspective papers that address these challenges and others that may be of growing or future relevance to polymer scientists and engineers.