Członka Sylwia, Strąkowska Anna, Kairytė Agnė
Faculty of Chemistry, Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland.
Laboratory of Thermal Insulating Materials and Acoustics, Faculty of Civil Engineering, Institute of Building Materials, Vilnius Gediminas Technical University, Linkmenu St. 28, LT-08217 Vilnius, Lithuania.
Materials (Basel). 2021 Feb 27;14(5):1128. doi: 10.3390/ma14051128.
In this study, coir fibers were successfully modified with henna (derived from the plant) using a high-energy ball-milling process. In the next step, such developed filler was used as a reinforcing filler in the production of rigid polyurethane (PUR) foams. The impact of 1, 2, and 5 wt % of coir-fiber filler on structural and physico-mechanical properties was evaluated. Among all modified series of PUR composites, the greatest improvement in physico-mechanical performances was observed for PUR composites reinforced with 1 wt % of the coir-fiber filler. For example, on the addition of 1 wt % of coir-fiber filler, the compression strength was improved by 23%, while the flexural strength increased by 9%. Similar dependence was observed in the case of dynamic-mechanical properties-on the addition of 1 wt % of the filler, the value of glass transition temperature increased from 149 °C to 178 °C, while the value of storage modulus increased by ~80%. It was found that PUR composites reinforced with coir-fiber filler were characterized by better mechanical performances after the UV-aging.
在本研究中，采用高能球磨工艺成功地用指甲花（源自植物）对椰壳纤维进行了改性。下一步，将这种开发的填料用作硬质聚氨酯（PUR）泡沫生产中的增强填料。评估了1%、2%和5%重量比的椰壳纤维填料对结构和物理机械性能的影响。在所有改性的PUR复合材料系列中，观察到用1%重量比的椰壳纤维填料增强的PUR复合材料在物理机械性能方面有最大的改善。例如，添加1%重量比的椰壳纤维填料时，压缩强度提高了23%，而弯曲强度提高了9%。在动态力学性能方面也观察到类似的相关性——添加1%重量比的填料时，玻璃化转变温度值从149℃提高到178℃，而储能模量值提高了约80%。研究发现，用椰壳纤维填料增强的PUR复合材料在紫外线老化后具有更好的机械性能。
