采用三官能度的四种分子量的聚醚多元醇(300、500、1000和3000)与异氰酸酯(PM200)“一步法”全水发泡制备聚氨酯泡沫(PUF)。采用热重分析、Flynn-Wall Ozawa法、锥形量热仪和烟密度分析了不同分子量对PUF热稳定性和燃烧性能的影响。结果表明,随着聚醚多元醇分子量的增加,材料的活化能先增大后减小。使用1000分子量聚醚多元醇制备的PUF具有最高的活化能和最佳的热稳定性,最低的峰值放热率(469kW/m2)和烟密度(51.3),这一测试有助于探索阻燃泡沫的固有燃烧行为。
Polyurethane foams (PUF) were synthesized with tri functional polyether polyols of four molecular weights (300,500,1000 and 3000) using the “one-step method” of all-water foaming.The effects of different molecular weights on the thermal stability and combustion performance of PUFs were investigated using thermogravimetric analysis,Flynn-Wall-Ozawa methods,cone calorimeter analysis and smoke density (Ds) analysis.The results indicated that the activation energy of PUFs first increased and then decreased with the increase of the molecular weight of the polyether polyol.The PUF prepared using polyether polyol with 1000 molecular weight possessed the highest activation energy and best thermal stability,with the lowest peak heat release rate (469kW/m2) and Ds (51.3),which was helpful for exploring the intrinsic combustion behavior of flame-retardant foams.
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基金资助
辽宁省教育厅项目(JYT2020011)
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