Janowski Grzegorz, Wójcik Marta, Frącz Wiesław, Bąk Łukasz, Ryzińska Grażyna
Department of Materials Forming and Processing, Rzeszow University of Technology, Powstańców Warszawy 8, 35-959 Rzeszów, Poland.
Materials (Basel). 2024 Dec 15;17(24):6136. doi: 10.3390/ma17246136.
The influence of the addition of ground buckwheat hulls on the properties of biocomposite on the basis of 3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) is presented here. The changes in the material after repeated reprocessing-up to five recycling cycles-are written in the paper. Analysis of the shrinkage, water adsorption, selected mechanical properties, tensile impact strength, hardness and the microstructure of the surface layer was performed. The results show that the application of the buckwheat hulls into the biopolymer decreases the material shrinkage. It improves the material dimensional stability, as well as increases the water adsorption in the wake of the hydrophobic properties of the filler. The addition of the natural filler also leads to an increase in composite stiffness. The decrease in the tensile impact strength and the elongation at break is also noted. The reprocessing of the biocomposite initially led to a decrease in its mechanical properties, but the results stabilized after further processing cycles. This indicates the improvement of the microstructure homogeneity. The microscopic analysis shows that buckwheat hull particles were better embedded in the matrix after recycling. The increase in hardness was also noted. The PHBV-ground buckwheat hull biocomposite is characterized by stable mechanical properties and by recycling resistance, which makes it a promising material in terms of the sustainable development.
本文介绍了添加磨碎的荞麦壳对基于3-羟基丁酸酯-共-3-羟基戊酸酯（PHBV）的生物复合材料性能的影响。论文中记录了材料在重复再加工（多达五个循环）后的变化。对收缩率、吸水性、选定的机械性能、拉伸冲击强度、硬度和表面层微观结构进行了分析。结果表明，将荞麦壳应用于生物聚合物中可降低材料收缩率。它提高了材料的尺寸稳定性，并由于填料的疏水性而增加了吸水性。添加天然填料还会导致复合材料刚度增加。还注意到拉伸冲击强度和断裂伸长率有所下降。生物复合材料的再加工最初导致其机械性能下降，但在进一步加工循环后结果趋于稳定。这表明微观结构均匀性得到改善。微观分析表明，再循环后荞麦壳颗粒更好地嵌入了基体中。还注意到硬度有所增加。PHBV-磨碎的荞麦壳生物复合材料具有稳定的机械性能和抗再循环性，这使其在可持续发展方面成为一种有前景的材料。
