Huang Hanxiao, Yu Yunshui, Qing Yan, Zhang Xiaofeng, Cui Jia, Wang Hankun
College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
Institute of New Bamboo and Rattan Based Biomaterials, International Center for Bamboo and Rattan, Beijing 100102, China.
Materials (Basel). 2020 Jan 19;13(2):477. doi: 10.3390/ma13020477.
In this study, water-soluble ammonium polyphosphate- (APP) and methyl trimethoxysilane (MTMS)-modified industrial bamboo residue (IBR)-derived holocellulose nanofibrils (HCNF/APP/MTMS) were used as the raw materials to prepare aerogels in a freeze-drying process. Synthetically modified aerogels were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, and thermal stability measurements. As-prepared HCNF/APP/MTMS aerogels showed themselves to be soft and flexible. The scanning electron microscopy (SEM) analysis showed that the foam-like structure translates into a 3D network structure from HCNF aerogels to HCNF/APP/MTMS aerogels. The compressive modules of the HCNF/APP/MTMS aerogels were decreased from 38 kPa to 8.9 kPa with a density in the range of 12.04-28.54 kg/m, which was due to the structural change caused by the addition of APP and MTMS. Compared with HCNF aerogels, HCNF/APP/MTMS aerogels showed a high hydrophobicity, in which the water contact angle was 130°, and great flame retardant properties. The peak of heat release rate (pHRR) and total smoke production (TSP) decreased from 466.6 to 219.1 kW/m and 0.18 to 0.04 m, respectively, meanwhile, the fire growth rate (FIGRA) decreased to 8.76 kW/s·m. The thermal conductivity of the HCNF/APP/MTMS aerogels was 0.039 W/m·K. All results indicated the prepared aerogels should be expected to show great potential for thermally insulative materials.
在本研究中，以水溶性聚磷酸铵（APP）和甲基三甲氧基硅烷（MTMS）改性的工业竹渣（IBR）衍生的全纤维素纳米纤维（HCNF/APP/MTMS）为原料，通过冷冻干燥工艺制备气凝胶。通过傅里叶变换红外光谱、X射线衍射和热稳定性测量对合成改性气凝胶进行了表征。所制备的HCNF/APP/MTMS气凝胶表现出柔软且柔韧的特性。扫描电子显微镜（SEM）分析表明，从HCNF气凝胶到HCNF/APP/MTMS气凝胶，泡沫状结构转变为三维网络结构。HCNF/APP/MTMS气凝胶的压缩模量从38 kPa降至8.9 kPa，密度范围为12.04 - 28.54 kg/m³，这是由于添加APP和MTMS导致的结构变化。与HCNF气凝胶相比，HCNF/APP/MTMS气凝胶具有高疏水性，其水接触角为130°，并且具有优异的阻燃性能。热释放速率峰值（pHRR）和总产烟量（TSP）分别从466.6降至219.1 kW/m²和从0.18降至0.04 m²，同时，火灾增长速率（FIGRA）降至8.76 kW/s·m²。HCNF/APP/MTMS气凝胶的热导率为0.039 W/m·K。所有结果表明，所制备的气凝胶有望在隔热材料方面展现出巨大潜力。
