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首页> 美国卫生研究院文献>Materials >Effects of Chemically Treated Eucalyptus Fibers on Mechanical Thermal and Insulating Properties of Polyurethane Composite Foams
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Effects of Chemically Treated Eucalyptus Fibers on Mechanical Thermal and Insulating Properties of Polyurethane Composite Foams

机译：化学处理的桉树纤维对聚氨酯复合泡沫塑料力学热学和绝缘性能的影响

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摘要

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.
机译：在这项工作中，通过掺入2 wt％的桉树纤维来制备硬质聚氨酯（PUR）泡沫。通过马来酸酐，碱和硅烷（三苯基硅烷醇）处理对桉树纤维进行了表面改性。分析了改性桉树纤维对聚氨酯泡沫的机械，热和防火性能的影响。观察到，添加桉树纤维显示出改善的机械性能和热性能，并且以硅烷处理的纤维具有312kPa的抗压强度和432kPa的抗弯强度显示出最佳的性能。此外，由于经硅烷处理的纤维改性的聚氨酯泡沫的热稳定性更好，因此热稳定性值显示出最低的下降。此外，用硅烷处理的纤维改性的聚氨酯泡沫的阻燃性也是研究的复合材料中最好的。锥形量热法测试表明，通过掺入硅烷处理的纤维，放热峰值从245降低到110 kW∙m。此外，还发现当掺入硅烷处理的纤维时，总的热释放和总的烟气释放显着降低。极限氧指数值从20.2％增加到22.1％。还发现炭渣残留量从24.4％增加到28.3％。可以得出结论，化学改性的桉树纤维的应用具有巨大的潜力，可以在硬质聚氨酯泡沫塑料中掺入良好的机械，热和防火性能。

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