Kairytė Agnė, Członka Sylwia, Boris Renata, Vėjelis Sigitas
Laboratory of Thermal Insulating Materials and Acoustics, Faculty of Civil Engineering, Institute of Building Materials, Vilnius Gediminas Technical University, Linkmenu Str. 28, LT-08217 Vilnius, Lithuania.
Institute of Polymer & Dye Technology, Lodz University of Technology, 90-924 Lodz, Poland.
Materials (Basel). 2021 Sep 22;14(19):5475. doi: 10.3390/ma14195475.
In the current study, rigid polyurethane foam (PUR) was modified with 10-30 wt.% sunflower press cake (SFP) filler, and its effect on performance characteristics-i.e., rheology, characteristic foaming times, apparent density, thermal conductivity, compressive strength parallel and perpendicular to the foaming directions, tensile strength, and short-term water absorption by partial immersion-was evaluated. Microstructural and statistical analyses were implemented as well. During the study, it was determined that 10-20 wt.% SFP filler showed the greatest positive impact. For instance, the thermal conductivity value improved by 9% and 17%, respectively, while mechanical performance, i.e., compressive strength, increased by 11% and 28% in the perpendicular direction and by 43% and 67% in the parallel direction. Moreover, tensile strength showed 49% and 61% increments, respectively, at 10 wt.% and 20 wt.% SFP filler. Most importantly, SFP filler-modified PUR foams were characterised by two times lower water absorption values and improved microstructures with a reduced average cell size and increased content in closed cells.
在当前研究中，采用10-30重量%的葵花籽压榨饼（SFP）填料对硬质聚氨酯泡沫（PUR）进行改性，并评估其对性能特性的影响，即流变学、特征发泡时间、表观密度、热导率、与发泡方向平行和垂直方向的抗压强度、拉伸强度以及部分浸入法的短期吸水率。还进行了微观结构和统计分析。在研究过程中，确定10-20重量%的SFP填料显示出最大的积极影响。例如，热导率值分别提高了9%和17%，而机械性能，即抗压强度，在垂直方向分别提高了11%和28%，在平行方向分别提高了43%和67%。此外，在10重量%和20重量%的SFP填料下，拉伸强度分别提高了49%和61%。最重要的是，SFP填料改性的PUR泡沫的特点是吸水率值降低了两倍，并且微观结构得到改善，平均泡孔尺寸减小，闭孔含量增加。
