COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Ronghua Yu,Jie Liu,Doudou Gao,Yanhui Wang,Xin Wen,Tao Tang
To improve the flame retardancy of polymer nanocomposites , a grafting strategy to modify carbon black nanoparticles by grafting sodium sulfonate (CB- g -SS) was developed in polycarbonate (PC) system. The grafting reaction for CB- g -SS was evaluated by FTIR, XPS and TGA , respectively. Furthermore, PC/CB- g -SS nanocomposites were prepared, and the striking effect of CB and SS on improving the flame retardancy of PC was investigated. With only 1 wt% of CB- g -SS, the PC nanocomposites exhibited a high limiting oxygen index of 33.1%, and V-0 rating in UL-94 test, as well as significant decrease on the peak of heat release rate (PHRR) by 51.6% in cone calorimeter test. The flame retardancy mechanism was also discussed, which was ascribed to the catalytic carbonization of SS on CB surfaces for promoting the formation of interconnected carbon layer. Thus, this work provides a useful and effective method for preparing high-performance PC nanocomposites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Huali Xie,Xuejun Lai,Hongqiang Li,Xingrong Zeng
Realizing the high efficiency of halogen-free flame retardant is one of the biggest challenges and the most urgent issues in the development of high performance polypropylene (PP). Coupling the catalytic carbonization and free-radical quenching mechanism is proposed to be an efficient method to address this issue. In this work, a functionalized zirconium phosphate (F-ZrP) with good catalytic carbonization capability was synthesized, and was combined with N-alkoxy hindered amine (NOR) to flame-retard PP. The composition showed high flame-retardant efficiency. When the content of NOR, F-ZrP and ammonium polyphosphate were 0.2 wt%, 4.95 wt% and 14.85 wt%, respectively, the flame retardant PP reached a limiting oxygen index of 36.0% and achieved a UL-94 V -0 rating. Meanwhile, the peak heat release rate , average heat release rate , total heat release, peak smoke production rate and total smoke production were declined by 95.6%, 90.6%, 73.3%, 93.5% and 80.6%, respectively. It revealed that F-ZrP formed closed micron-scale char-cages via interfacial carbonization. In the char-cages, the nitroxyl radicals generated by NOR efficiently quenched the active free-radicals produced by PP and induce their cyclization reaction. Under the further catalytic effect of ZrP, graphitized crystalline char with extraordinary thermostability and barrier effect was generated quickly and protected the polymer from burning.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 17
·2300162
·
IF 4.6
Hui Xu,Chaohua Peng,Long Xia,Zhongxi Miao,Siyuan He,Cheng Chi,Weiang Luo,Guorong Chen,Birong Zeng,Shuchuan Wang,Lizong Dai
Smoke emission and smoke toxicity have drawn more attention to improving the fire safety of polymers. In this work, a polyoxometalates (POMs)-based hybrids flame retardant (P-AlMo 6 ) epoxy resin (EP) is prepared with toxicity-reduction and smoke-suppression properties via a peptide coupling reaction between POMs and organic molecules with double DOPO (bisDOPA). It combines the good compatibility of the organic molecule and the superior catalytic performance of POMs. Compared to pure EP, the glass transition temperature and flexural modulus of EP composite with 5 wt.% P-AlMo 6 (EP/P-AlMo 6 -5) are raised by 12.3 °C and 57.75%, respectively. Notably, at low flame-retardant addition, the average CO to CO 2 ratio (Av-COY/Av-CO 2 Y) is reduced by 33.75%. Total heat release (THR) and total smoke production (TSP) are lowered by 44.4% and 53.7%, respectively. The Limited Oxygen Index (LOI) value achieved 31.7% and obtained UL-94 V-0 rating. SEM, Raman, X-ray photoelectron spectroscopy, and TG-FTIR are applied to analyze the flame-retardant mechanism in condensed and gas phase. Outstanding flame retardant, low smoke toxicity properties are attained due to the catalytic carbonization ability of metal oxides Al 2 O 3 and MoO 3 produced from the breakdown of POMs. This work advances the development of POMs-based hybrids flame retardants with low smoke toxicity properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 18
·22639-22647
·
IF 3.056
Ren Qiangqiang,He Limo,Hu Song,Li Hanjian,Li Shanxue,Deng Zengtong,Song Gongxiang,Su Sheng,Wang Yi,Xiang Jun
The formation of highly graphitic phenolic resin chars (GPFCs) during catalytic carbonization at relatively low reaction temperature (1200–1600 °C) using novel Ni-Zn-B alloy catalyst with small amount of addition (5–15%) was systematically studied. Only two kinds of graphites (turbostratic graphite and ordered graphite) can be found in GPFCs after catalytic carbonization with Ni-Zn-B and their proportions were changed with reaction conditions. When Ni-Zn-B was involved at 1200–1600 °C, the phenolic resin char was fully transformed to be graphite, and ordered graphite content increased to 28.42% at 1400 °C, which was also almost twice of ordered graphite content in the char catalyzed by pure Ni. But the order graphite content would decrease due to sintering at higher reaction temperature. The addition of Zn and B can promote nickel-based alloy catalytic action by reducing melt point and accelerating graphitization respectively. It was also found that ordered graphite content could be used as a key evaluation parameter to directly reflect the quality of GPFCs based on detailed characteristics analysis. The model between three reaction conditions (reaction temperature, retention time, catalyst content) and ordered graphite content was built with artificial neural network (ANN), and the prediction accuracy of ANN was high up to 91.48%.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junlin Zhu,Zhaotian Ba,Yuanmeng Lou,Cui Li,Lili Ma,Jie Liu,Xin Wen,Tao Tang
To effectively mitigate the environmental and ecological impacts stemming from polymer wastes, the development of innovative recycling and reusing strategies is of utmost importance. In response to the call of “Waste-to-Wealth”, this study presents a green and efficient method to convert waste polypropylene (waste protective cloths, WPC) into Ni@CNTs hybrids via catalytic carbonization. Subsequently, these Ni@CNTs hybrids are directly applied as functional nanofillers to prepare fire resistant polycarbonate (PC) composites. The experimental results demonstrated that the combined catalysts composed of NiCl 2 /Ni(C 5 H 7 O 2 ) 2 were efficient in catalyzing WPC into Ni@ CNTs hybrids, achieving the yield was as high as 58.6 g/100 g WPC. Leveraging the superior characteristics of Ni@CNTs hybrids, they were used as a fire retardant of polycarbonate (PC) matrix to fabricate PC/Ni@CNTs composites. The PC/3Ni@CNTs exhibited excellent fire retardancy, as evidenced by the limited oxygen index (LOI) of 30.5 %, the V 0 rating in UL-94 vertical burning test, and the 64.1 % reduction in the peak of heat release rate (PHRR) in cone calorimeter test. Meanwhile, it displayed low toxicity with 75.0 % reduction in the peak of CO production (COP). The mechanism was attributed to the synergistic effects of Ni and CNTs, which combine the catalyzing carbonization and the enhanced char layer together in condensed phase. Thus, this study provides a green and sustainable strategy for the conversion of polymer wastes into high-valuable carbon/metal hybrids, and exploits their advanced application in the fabrication of fire-resistant polymer composites.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Hui Peng,Guofu Ma,Kanjun Sun,Jingjing Mu,Zhe Zhang,Ziqiang Lei
Two-dimensional mesoporous carbon nanosheets (CNSs) have been prepared via simultaneous activation and catalytic carbonization route using macroporous anion-exchange resin (AER) as carbon precursor and ZnCl2 and FeCl3 as activating agent and catalyst, respectively. The iron catalyst in the skeleton of the AER may lead to carburization to form a sheetlike structure during the carbonization process. The obtained CNSs have a large number of mesopores, a maximum specific surface area of 1764.9 m2 g–1, and large pore volume of 1.38 cm3 g–1. As an electrode material for supercapacitors application, the CNSs electrode possesses a large specific capacitance of 283 F g–1 at 0.5 A g–1 and excellent rate capability (64% retention ratio even at 50 A g–1) in 6 mol L–1 KOH. Furthermore, CNSs symmetric supercapacitor exhibits specific energies of 17.2 W h kg–1 at a power density of 224 W kg–1 operated in the voltage range of 0–1.8 V in 0.5 mol L–1 Na2SO4 aqueous electrolyte, and outstanding cyclability (retains about 96% initial capacitance after 5000 cycles).
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wenbin Ye,Yong Li,Dongxu Zhang,Hongsheng Xu,Lei Song,Yuan Hu,Weizhao Hu
Extreme climatic alteration has provoked an increase in global forest grassland fires. The establishment of emergency firebreaks is essential for managing the occurrence of sudden forest grassland fires. However, conventional methods entail substantial labor, exorbitant costs, and limited emergency response, impeding the prompt and efficient containment of fire outbreaks. Therefore, constructing rapid implementation of emergency firebreaks is pivotal for the precise prevention and control of forest grassland fires. Herein, a multi-element synergistic surface-modified bio-based flame retardant with catalytic carbonization was fabricated, which can catalyze and bolster the dehydration of phosphate compounds into char during combustion. The fire resistance of vegetation is significantly enhanced by synergizing with ammonium polyphosphate (APP), resulting in peak heat release rate, total heat release, and total smoke production respectively exhibiting 35.5 %, 22.9 %, and 47.5 % reduction. The catalytic carbonization behavior and mechanism of it were further investigated in this work. Furthermore, the synergistic effect of the fire retardant was confirmed through fire spread experiments, demonstrating the capability to suppress flame propagation by restraining the decomposition of vegetation and debilitating thermal radiation. Overall, this study aims at providing a cost-effective, rapid, and efficient method for establishing emergency firebreaks in challenging terrains.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-13
·
IF 9.043
Yang Chengdong,Zhou Mi,He Chao,Gao Yun,Li Shuang,Fan Xin,Lin Yi,Cheng Fei,Zhu Puxin,Cheng Chong
Abstract To overcome the ever-growing organic pollutions in the water system, abundant efforts have been dedicated to fabricating efficient Fenton-like carbon catalysts. However, the rational design of carbon catalysts with high intrinsic activity remains a long-term goal. Herein, we report a new N -molecule-assisted self-catalytic carbonization process in augmenting the intrinsic Fenton-like activity of metal–organic-framework-derived carbon hybrids. During carbonization, the N -molecules provide alkane/ammonia gases and the formed iron nanocrystals act as the in situ catalysts, which result in the elaborated formation of carbon nanotubes (in situ chemical vapor deposition from alkane/iron catalysts) and micro-/meso-porous structures (ammonia gas etching). The obtained catalysts exhibited with abundant Fe/Fe–N x /pyridinic-N active species, micro-/meso-porous structures, and conductive carbon nanotubes. Consequently, the catalysts exhibit high efficiency toward the degradation of different organic pollutions, such as bisphenol A, methylene blue, and tetracycline. This study not only creates a new pathway for achieving highly active Fenton-like carbon catalysts but also takes a step toward the customized production of advanced carbon hybrids for diverse energy and environmental applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jiaojiao Xu,Lujia Yang,Yichen Zhou,Muying Yuan,Bihe Yuan
The leakage of hazardous chemicals and viscous crude oil represents one of the most pressing environmental challenges today. Developing efficient and eco-friendly approaches to facilitate organic solvents and oil absorption is crucial for addressing these issues. In this research, a hydrophobic photothermal biochar (Cu-PPC) was synthesized via catalytic carbonization of pomelo peel with copper ions and urea. The results indicate that Cu-PPC possesses outstanding hydrophobicity (with a water contact angle of 142.4°) and absorption capacity (up to 26.4 g/g), along with exceptional thermal stability and fire resistance. Additionally, Cu-PPC displays a remarkable photothermal effect, as the surface temperature rapidly reaches 89.1 °C within 5 min under solar irradiation of 1 kW/m². Leveraging this property, Cu-PPC effectively elevates temperature under illumination and successfully reduces the viscosity of surrounding silicone oil, thereby reducing the absorption time from 61 s to 41 s and achieving a 32.8% reduction. This biochar efficiently separates various oil-water mixtures, demonstrating outstanding cyclic absorption stability and broad application potential. This biochar absorbent is a novel method for treating agricultural waste and provides a simple, low-cost and efficient avenue for addressing organic solvents and crude oil spills.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）