Functionalized Carbon Nanotubes with Phosphorus- and Nitrogen-Containing Agents: Effective Reinforcer for Thermal, Mechanical, and Flame-Retardant Properties of Polystyrene Nanocomposites

2016 ◽  
Vol 8 (39) ◽  
pp. 26266-26274 ◽  
Author(s):  
Weiyi Xing ◽  
Wei Yang ◽  
Wenjie Yang ◽  
Qihang Hu ◽  
Jingyu Si ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Flame Retardant ◽  
Functionalized Carbon Nanotubes ◽  
Flame Retardant Properties ◽  
Effective Reinforcer

scholarly journals Study on the Synergies of Nanoclay and MWCNTs to the Flame Retardant and Mechanical Properties of Epoxy Nanocomposites

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Tuan Anh Nguyen
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Adverse Effects ◽  
Flame Retardant ◽  
Organic Compounds ◽  
Flame Retardants ◽  
Nanocomposite Materials ◽  
Negative Effects ◽  
Multiwalled Carbon ◽  
Flame Retardant Properties

Modern flame retardants are organic compounds containing halogen or phosphorus groups and are not always well dispersed in polymers. Thus, by using a small amount of nanoclay and multiwalled carbon nanotubes (MWCNTs), they can significantly reduce the number of conventional flame retardant additives, making the material with optimal flame retardant properties. Conventional flame retardants always have some negative effects on the mechanical properties of the polymer substrate, so by using nanoclay and MWCNTs, those adverse effects can be minimized and overcome. In this work, in order to improve the mechanical properties and flame retardant of nanocomposite materials, nanoclay I.30E and MWCNTs are mixed into epoxy, with the selected percentage of 2% and 0.02% by weight, respectively, stirring mechanically for 7, 8, and 9 hours at 3000 rpm at 80°C, then performing ultrasonic vibration for 6 hours at 65°C.

Tunable thermal, flame retardant and toxic effluent suppression properties of polystyrene based on alternating graphitic carbon nitride and multi-walled carbon nanotubes

2015 ◽  
Vol 3 (33) ◽  
pp. 17064-17073 ◽  
Author(s):  
Yongqian Shi ◽  
Ze Long ◽  
Bin Yu ◽  
Keqing Zhou ◽  
Zhou Gui ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Flame Retardant ◽  
Fire Safety ◽  
Carbon Nitride ◽  
Polymeric Materials ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Multi Walled Carbon Nanotubes ◽  
Flame Retardant Properties ◽  
Walled Carbon Nanotubes

Significant improvements in thermal and flame retardant properties of polymeric materials at low loadings hold tremendous promise for fire safety materials.

scholarly journals Effects of Hybrid Graphene Oxide with Multiwalled Carbon Nanotubes and Nanoclay on the Mechanical Properties and Fire Resistance of Epoxy Nanocomposite

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Tuan Anh Nguyen ◽  
Thi Thu Trang Bui
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Flame Retardant ◽  
Multiwalled Carbon Nanotubes ◽  
Fire Resistance ◽  
Nanocomposite Materials ◽  
Multiwalled Carbon ◽  
Epoxy Nanocomposite ◽  
Flame Retardant Properties

In this study, nanoclay I.30E and multiwalled carbon nanotubes (MWCNT) were hybridized with graphene oxide (GO) on Epikote 240 epoxy resin. Research results show that the hybridization between 0.5 wt.% GO with 1 or 3 wt.% nanoclay and 0.05 wt.% MWCNT has better mechanical properties and flame-retardant properties than the component materials. The combination of epoxy nanocomposite materials with flame-retardant additives such as nanoclay, MWCNT, and GO leads to improving flame-retardant and mechanical properties. Flame-retardant materials have no environmental problems and are nontoxic. Therefore, the flame-retardant additives studied in this work have great potential to become one of the promising flame-retardant hybrid materials. The study also showed that the result of the combination, the hybridization between the three components (nanoclay, MWCNT, and GO) synergized the mechanisms of fire resistance, creating insulating barriers, preventing objects from entering material exposed to heat and oxygen in the air.

Functionalized multiwalled carbon nanotubes by loading phosphorylated chitosan

2017 ◽  
Vol 30 (9) ◽  
pp. 1036-1047
Author(s):  
Baoxia Xue ◽  
Yun Peng ◽  
Yinghao Song ◽  
Jie Bai ◽  
Mei Niu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Flame Retardant ◽  
Multiwalled Carbon Nanotubes ◽  
Flame Retardancy ◽  
Char Residue ◽  
Combustion Time ◽  
Multiwalled Carbon ◽  
Decomposition Products ◽  
Flame Retardant Properties

Novel flame-retardant phosphorylated chitosan-multiwalled carbon nanotubes (PCS-MWCNTs) were obtained by the loading of PCS on the surface of MWCNTs by a chemical deposition cross-linking method. A series of polyethylene terephthalate (PET) composites were prepared by melt compounding with MWCNTs or PCS-MWCNTs to investigate the flame-retardant properties. Field-emission scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared (FTIR) spectrometry were employed to characterize the morphology, chemical structure, and functionalization effect of MWCNTs. The coating degree and thermal stability of PCS-MWCNTs were investigated by thermogravimetric analysis (TGA). Thermal decomposition products after TGA and flame-retardant properties of PET composites were characterized by FTIR and CONE measurements, respectively. The results indicated that PCS is loaded on the MWCNT surface. Modified PCS-MWCNTs exhibited better dispersion and efficient flame retardancy. TGA data indicated that PCS-MWCNTs can enhance the onset temperature of PET and increase the amount of the char residues. The char residue with 1 wt% PCS-MWCNTs/PET increased from 12.62% (pure PET) to 15.46%. The analysis of the decomposition products and morphology of the char residue indicated that PCS-MWCNTs not only retain the effect of alternating couplet carbon (C) and physical barrier by MWCNTs, but also form P–C compounds, improving the flame retardancy of PET. CONE tests demonstrated that the PCS-MWCNTs lead to the efficient decrease in the flammability parameters, such as the heat release rate (HRR), total release heat rate (THR), total smoke production (TSP), mean mass loss rate (MMLR), and the total combustion time. The peak HRR value decreased from 513.22 kW m−2 to 341 kW m−2. The THR, TSP, and MMLR values decreased by 20.38 MJ m−2, 1.1 m2, and 1.32 g s−1, respectively. The total combustion time decreased by 98 s, from 388 s to 290 s, indicating that PCS-MWCNTs extinguish fire.

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