Borkowski Grzegorz, Martyła Agnieszka, Dobrosielska Marta, Marciniak Piotr, Gabriel Ewa, Głowacka Julia, Jałbrzykowski Marek, Pakuła Daria, Przekop Robert E
Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, ul. B. Krygowskiego 10, 61-680 Poznan, Poland.
Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, ul. Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland.
Materials (Basel). 2022 Sep 2;15(17):6106. doi: 10.3390/ma15176106.
In this study, the influence of carbonate lake sediments (Polylactide/Carbonate Lake Sediments-PLA/CLS) on the mechanical and structural properties of polylactide matrix composites was investigated. Two fractions of sediments originating from 3-8 and 8-12 m were analysed for differences in particle size by distribution (Dynamic Light Scattering-DLS), phase composition (X-ray Diffraction-XRD), the presence of surface functional groups (Fourier Transform-Infrared-FT-IR), and thermal stability (Thermogravimetric Analysis-TGA). Microscopic observations of the composite fractures were also performed. The effect of the precipitate fraction on the mechanical properties of the composites before and after conditioning in the weathering chamber was verified through peel strength, flexural strength, and impact strength tests. A melt flow rate study was performed to evaluate the effect of sediment on the processing properties of the PLA/CLS composite. Hydrophobic-hydrophilic properties were also investigated, and fracture analysis was performed by optical and electron microscopy. The addition of carbon lake sediments to PLA allows for the obtention of composites resistant to environmental factors such as elevated temperature or humidity. Moreover, PLA/CLS composites show a higher flow rate and higher surface hydrophobicity in comparison with unmodified PLA.
在本研究中，研究了碳酸盐湖沉积物（聚乳酸/碳酸盐湖沉积物-PLA/CLS）对聚乳酸基复合材料力学性能和结构性能的影响。分析了来自3-8米和8-12米的两个沉积物级分，通过粒度分布（动态光散射-DLS）、相组成（X射线衍射-XRD）、表面官能团的存在情况（傅里叶变换红外光谱-FT-IR）以及热稳定性（热重分析-TGA）来研究其差异。还对复合材料的断裂进行了微观观察。通过剥离强度、弯曲强度和冲击强度测试，验证了沉淀级分对复合材料在老化箱中老化前后力学性能的影响。进行了熔体流动速率研究，以评估沉积物对PLA/CLS复合材料加工性能的影响。还研究了疏水-亲水性能，并通过光学显微镜和电子显微镜进行了断裂分析。向PLA中添加碳湖沉积物可获得耐环境因素（如高温或高湿度）的复合材料。此外，与未改性的PLA相比，PLA/CLS复合材料具有更高的流动速率和更高的表面疏水性。
