Członka Sylwia, Strąkowska Anna, Pospiech Piotr, Strzelec Krzysztof
Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland.
Centre of Papermaking and Printing, Lodz University of Technology, Wolczanska 223, 90-924 Lodz, Poland.
Materials (Basel). 2020 Apr 10;13(7):1781. doi: 10.3390/ma13071781.
In this work, rigid polyurethane (PUR) foams were prepared by incorporating 2 wt% of eucalyptus fibers. The eucalyptus fibers were surface-modified by maleic anhydride, alkali, and silane (triphenylsilanol) treatment. The impact of the modified eucalyptus fibers on the mechanical, thermal, and fire performances of polyurethane foams was analyzed. It was observed that the addition of eucalyptus fibers showed improved mechanical and thermal properties and the best properties were shown by silane-treated fibers with a compressive strength of 312 kPa and a flexural strength of 432 kPa. Moreover, the thermal stability values showed the lowest decline for polyurethane foams modified with the silane-treated fibers, due to the better thermal stability of such modified fibers. Furthermore, the flame resistance of polyurethane foams modified with the silane-treated fibers was also the best among the studied composites. A cone calorimetry test showed a decrease in the peak of heat release from 245 to 110 kW∙m by the incorporation of silane-treated fibers. Furthermore, total heat release and total smoke release were also found to decrease remarkably upon the incorporation of silane-treated fibers. The value of limiting oxygen index was increased from 20.2% to 22.1%. Char residue was also found to be increased from 24.4% to 28.3%. It can be concluded that the application of chemically modified eucalyptus fibers has great potential as an additive to incorporate good mechanical, thermal, and fire properties in rigid polyurethane foams.
在这项工作中，通过加入2 wt%的桉木纤维制备了硬质聚氨酯（PUR）泡沫。桉木纤维通过马来酸酐、碱和硅烷（三苯基硅醇）处理进行表面改性。分析了改性桉木纤维对聚氨酯泡沫的机械、热和燃烧性能的影响。观察到，添加桉木纤维显示出机械和热性能得到改善，硅烷处理的纤维表现出最佳性能，其压缩强度为312 kPa，弯曲强度为432 kPa。此外，热稳定性值表明，用硅烷处理的纤维改性的聚氨酯泡沫下降幅度最小，这是由于此类改性纤维具有更好的热稳定性。此外，在研究的复合材料中，用硅烷处理的纤维改性的聚氨酯泡沫的阻燃性也是最好的。锥形量热法测试表明，加入硅烷处理的纤维后，热释放峰值从245 kW∙m²降至110 kW∙m²。此外，还发现加入硅烷处理的纤维后，总热释放和总烟雾释放也显著降低。极限氧指数值从20.2%提高到22.1%。残炭也从24.4%增加到28.3%。可以得出结论，化学改性桉木纤维作为一种添加剂在硬质聚氨酯泡沫中引入良好的机械、热和燃烧性能具有巨大潜力。
