Okuda Kohei, Shigemasa Ryosuke, Hirota Ken, Mizutani Tadashi
Department of Applied Chemistry, Faculty of Science and Engineering, Doshisha University, Tatara-miyakotani, 1-3, Kyotanabe, Kyoto 610-0394, Japan.
ACS Omega. 2022 Apr 1;7(14):12127-12137. doi: 10.1021/acsomega.2c00423. eCollection 2022 Apr 12.
Nanohydroxyapatite (HAP) was crystallized in an aqueous solution of carboxymethyl cellulose (CMC) to prepare the composites of CMC and HAP with a stable interface between them with the aim of developing a sustainable tough biomass composite material inspired by bone. The temperature (room temperature to 90 °C) and the concentration of CMC (0.83-13.2 g/L) were optimized for the mechanical properties of the composites. The composite containing 67 wt % HAP prepared at 50 °C in the presence of 9.9 g/L CMC exhibited the largest flexural strength of 113 ± 2 MPa and the elastic modulus of 7.7 ± 0.3 GPa. X-ray diffraction showed that nanometer-sized HAP crystals were formed with a large aspect ratio, and energy-dispersive X-ray spectroscopy and infrared spectroscopy revealed that CMC was bound to the surface of HAP through an ionic interaction between Ca and COO. Since the composite has a higher flexural strength than polyamide 6 (92 MPa) and a higher elastic modulus than polyamide 6 with 40 wt % glass fiber (5.5 GPa), it can be used as new tough biomass composite material to replace petroleum-derived engineering plastics.
纳米羟基磷灰石（HAP）在羧甲基纤维素（CMC）水溶液中结晶，以制备CMC与HAP的复合材料，使其界面稳定，旨在开发一种受骨骼启发的可持续坚韧生物质复合材料。针对复合材料的力学性能，对温度（室温至90°C）和CMC浓度（0.83 - 13.2 g/L）进行了优化。在50°C、9.9 g/L CMC存在的条件下制备的含67 wt% HAP的复合材料表现出最大弯曲强度113±2 MPa和弹性模量7.7±0.3 GPa。X射线衍射表明形成了具有大纵横比的纳米级HAP晶体，能量色散X射线光谱和红外光谱显示CMC通过Ca与COO之间的离子相互作用与HAP表面结合。由于该复合材料的弯曲强度高于聚酰胺6（92 MPa），弹性模量高于含40 wt%玻璃纤维的聚酰胺6（5.5 GPa），因此它可作为新型坚韧生物质复合材料来替代石油衍生的工程塑料。
