Novel CuCo2O4/graphitic carbon nitride nanohybrids: Highly effective catalysts for reducing CO generation and fire hazards of thermoplastic polyurethane nanocomposites
Novel CuCo2O4/graphitic carbon nitride nanohybrids: Highly effective catalysts for reducing CO generation and fire hazards of thermoplastic polyurethane nanocomposites
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新型 CuCo2O4/石墨氮化碳纳米杂化物：用于减少热塑性聚氨酯纳米复合材料 CO 生成和火灾危险的高效催化剂
DOI：
10.1016/j.jhazmat.2015.03.041
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发表时间：
2015-08-15
影响因子：
13.6
通讯作者：
Jiang, Saihua
中科院分区：
文献类型：
--
作者：
Shi, Yongqian;Yu, Bin;Jiang, Saihua
采用水热法制备了不同g-C3N4/CuCo2O4质量比的新型尖晶石相钴酸铜(CuCo2O4)/石墨化碳氮化物(简称C-CuCO2O4)纳米杂化材料。然后将纳米杂化材料添加到热塑性聚氨酯(TPU)基质中，采用母料-熔融共混法制备了TPU纳米复合材料。形貌分析表明，CuCo2O4纳米粒子均匀分布在g-C3N4纳米片上。热分析表明，C-CuCo2O4-7(g-C3N4与CuCo2O4的比例为93/7)是一种改善TPU性能的最佳纳米杂化材料。在热塑性弹性体中加入C-CuCo2O4-7可以显著提高热塑性弹性体的起始分解温度、最大失重温度和残炭率。与纯TPU相比，TPU/C-CuCo2O4-7的放热速率和总放热分别降低了37%和31.3%。此外，热解气体产物，包括可燃挥发分和一氧化碳(CO)的数量显著减少，而不可燃气体(二氧化碳)的数量增加。由于g-C3N4和CuCo2O4之间的协同作用，C-CuCo2O4-7在TPU主体中具有良好的分散性。热稳定性和阻燃性的提高归因于g-C3N4纳米片表现出物理阻挡效应和催化一氧化氮(NO)的分解，以及CuCo2O4催化CO与NO的反应和增加的残炭。(C)由爱思唯尔出版的2015年。
Novel spinel copper cobaltate (CuCo2O4)/graphitic carbon nitride (g-C3N4) (named C-CuCO2O4) nanohybrids with different weight ratios of g-C3N4 to CuCo2O4 were successfully synthesized via a facile hydrothermal method. Then the nanohybrids were added into the thermoplastic polyurethane (TPU) matrix to prepare TPU nanocomposites using a master batch-melt compounding approach. Morphological analysis indicated that CuCo2O4 nanoparticles were uniformly distributed on g-C3N4 nanosheets. Thermal analysis revealed that C-CuCo2O4-7 (proportion of g-C3N4 to CuCo2O4 of 93/7) was an optimal nanohybrid for the properties improvement of TPU. Incorporation of C-CuCo2O4-7 into TPU led to significant improvements in the onset decomposition temperature, temperature at maximal mass loss rate and char yields. The heat release rate and total heat release of TPU/C-CuCo2O4-7 decreased by 37% and 31.3%, respectively, compared with those of pure TPU. Furthermore, the amounts of pyrolysis gaseous products, including combustible volatiles and carbon monoxide (CO), were remarkably reduced, whereas, non-flammable gas (carbon dioxide) increased. Excellent dispersion of C-CuCo2O4-7 in TPU host was achieved, due to the synergistic effect between g-C3N4 and CuCo2O4. Enhancements in the thermal stability and flame retardancy were attributed to the explanations that g-C3N4 nanosheets showed the physical barrier effect and catalytic nitrogen monoxide (NO) decomposition, and that CuCo2O4 catalyzes the reaction of CO with NO and increased char residues. (C) 2015 Published by Elsevier B.V.