羟基磷灰石/细菌纤维素纳米复合材料的制备与热力学性能表征(英文)

Preparation and Thermo-Mechanical Characterization of Hydroxyapatite/Bacterial Cellulose Nanocomposites

通过仿生途径制备了模拟天然骨成分的羟基磷灰石/细菌纤维素(hydroxyapatite/bacterial cellulose,HAp/BC)纳米复合材料,使用TGA(thermo-gravimetric analysis)、DSC(differential scanning calorimetry)和DMA(dynamic mechanical analysis)测试方法对复合材料进行了热力学表征,以此来了解复合材料的成分组成、热稳定性和热力学行为.实验结果表明,纳米复合材料的成分与天然骨相似,并且热稳定性与纯BC相比有所提高;纳米复合材料在热分解时存在复杂的吸热放热现象;由于HAp的加入,与BC相比,复合材料的玻璃化转变温度向高温区域移动.

Hydroxyapatite/bacterial cellulose （HAp/BC） nanocomposites, which mimic the composition of natural bone, were prepared via a biomimetic route. In this study, thermal analysis of these HAp/BC nanocomposites was conducted to investigate the compositions, thermal stability, and thermo-mechanical behaviors of HAp/BC nanocomposites, using thermo-gravimetric analysis （TGA）, differential scanning calorimetry （DSC） and dynamic mechanical analysis （DMA）. TGA results reveal that the composition of these nanocomposites is similar to natural bone and their thermal stability is improved in the presence of hydroxyapatite. Discrepancy of thermal behaviors between BC and HAp/BC nanocomposites is also observed from DSC results. The glass transition temperature, obtained from the DMA curves of the nanocomposites is increased by the incorporation of hydroxyapatite.