Grząbka-Zasadzińska Aleksandra, Woźniak Magdalena, Kaszubowska-Rzepka Agata, Baranowska Marlena, Sip Anna, Ratajczak Izabela, Borysiak Sławomir
Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland.
Department of Chemistry, Poznan University of Life Sciences, Wojska Polskiego 75, 60-625 Poznan, Poland.
Materials (Basel). 2024 Feb 1;17(3):698. doi: 10.3390/ma17030698.
This study investigates the suitability of using caffeine-treated and untreated black cherry ( Ehrh.) wood as a polylactide filler. Composites containing 10%, 20%, and 30% filler were investigated in terms of increasing the nucleating ability of polylactide, as well as enhancing its resistance to microorganisms. Differential scanning calorimetry studies showed that the addition of caffeine-treated wood significantly altered the crystallization behavior of the polymer matrix, increasing its crystallization temperature and degree of crystallinity. Polarized light microscopic observations revealed that only the caffeine-treated wood induced the formation of transcrystalline structures in the polylactide. Incorporation of the modified filler into the matrix was also responsible for changes in the thermal stability and decreased hydrophilicity of the material. Most importantly, the use of black cherry wood treated with caffeine imparted antifungal properties to the polylactide-based composite, effectively reducing growth of , , , and . For the first time, it was reported that treatment of wood with a caffeine compound of natural origin alters the supermolecular structure, nucleating abilities, and imparts antifungal properties of polylactide/wood composites, providing promising insights into the structure-properties relationship of such composites.
本研究考察了经咖啡因处理和未经处理的黑樱桃（Ehrh.）木材作为聚乳酸填料的适用性。对含有10%、20%和30%填料的复合材料进行了研究，以探讨其提高聚乳酸成核能力以及增强其抗微生物性能的情况。差示扫描量热法研究表明，添加经咖啡因处理的木材显著改变了聚合物基体的结晶行为，提高了其结晶温度和结晶度。偏光显微镜观察显示，只有经咖啡因处理的木材能诱导聚乳酸中形成横晶结构。将改性填料加入基体还导致了材料热稳定性的变化和疏水性的降低。最重要的是，使用经咖啡因处理的黑樱桃木材赋予了聚乳酸基复合材料抗真菌性能，有效减少了 、 、 和 的生长。首次报道了用天然来源的咖啡因化合物处理木材会改变聚乳酸/木材复合材料的超分子结构、成核能力并赋予其抗真菌性能，为这类复合材料的结构-性能关系提供了有前景的见解。
