Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China.
Carbohydr Polym. 2020 Apr 1;233:115818. doi: 10.1016/j.carbpol.2019.115818. Epub 2019 Dec 31.
The binary nanocomposites blended by carboxymethyl cellulose (CMC) and SiO nanoparticles were constructed to prepare the films with superior thermal stability and flame retardant properties. The incorporation of cellulose nanofibers(CNFs) and SiO nanoparticles were followed to prepare ternary nanocomposite films exhibiting excellent mechanical properties. The mechanism and chemical reaction of the thermal decomposition for the CMC/SiO composite membrane were proposed, which showed that the mass residuals were NaCO, SiO and NaSiO, NaCO when the content of the SiO nanoparticles was lowered and higher than 9.6 %, respectively. Compared with the pure CMC, micro combustion calorimeter (MCC) showed that the total heat release (THR) and the peak heat release rate (PHRR) both decreased from 6.4 kJ/g to 5.8 kJ/g, 134 w/g to 27 w/g, respectively. Moreover, mechanical properties of CMC/CNFs/SiO membrane showed that the toughness and rigidity of the nanocomposites increased by 56.0 % and 63.0 % on the basis of CMC, respectively.
将羧甲基纤维素 (CMC) 和 SiO2 纳米粒子混合形成的二元纳米复合材料进行构建，以制备具有优异热稳定性和阻燃性能的薄膜。加入纤维素纳米纤维 (CNFs) 和 SiO2 纳米粒子，以制备具有优异机械性能的三元纳米复合材料薄膜。提出了 CMC/SiO2 复合膜热分解的机理和化学反应，结果表明，当 SiO2 纳米粒子的含量降低至 9.6%以下和高于 9.6%时，质量残余物分别为 Na2CO3、SiO2 和 Na2SiO3、Na2CO3。与纯 CMC 相比，微型量热计 (MCC) 表明，总热释放量 (THR) 和峰值热释放速率 (PHRR) 分别从 6.4 kJ/g 降低至 5.8 kJ/g，从 134 w/g 降低至 27 w/g。此外，CMC/CNFs/SiO 膜的机械性能表明，纳米复合材料的韧性和刚性分别比 CMC 提高了 56.0%和 63.0%。
