scholarly journals Mechanical Strength Improvements of Carbon Nanotube Threads through Epoxy Cross-Linking

Materials ◽  
2016 ◽  
Vol 9 (2) ◽  
pp. 68 ◽  
Author(s):  
Qingyue Yu ◽  
Noe Alvarez ◽  
Peter Miller ◽  
Rachit Malik ◽  
Mark Haase ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Mechanical Strength ◽  
Cross Linking

Facile Fabrication of Degradable Polyurethane Thermosets with High Mechanical Strength and Toughness via the Cross-linking of Triple Boron-Urethane Bonds

2021 ◽  
Author(s):  
Chunyang Bao ◽  
Xuhao Zhang ◽  
Pengdong Yu ◽  
Qingzhong Li ◽  
Yusheng Qin ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Cross Linking ◽  
Degradable Polymers ◽  
Sustainable Society ◽  
High Mechanical Strength ◽  
Facile Fabrication ◽  
The Cross ◽  
Strength And Toughness

Degradable polymers that play an increasingly important role in the development of sustainable society are highly demanded to feature not only high mechanical strength, but also exhibit superior toughness. Herein,...

Research on Biological Performance of Partially Oxidized Calcium Alginate Gel

2011 ◽  
Vol 403-408 ◽  
pp. 2985-2988
Author(s):  
Ping Zhang ◽  
Ling Bin Lu ◽  
Hai Feng Yang ◽  
Yang Cao
Keyword(s):  
Mechanical Strength ◽  
Calcium Ions ◽  
Compression Strength ◽  
Calcium Alginate ◽  
Cross Linking ◽  
Swelling Ratio ◽  
Oxidation Degree ◽  
Calcium Alginate Gel ◽  
Biological Performance ◽  
Oxidized Sodium Alginate

The degradable and well-distributed calcium alginates were obtained successfully by ionically cross-linking reaction which was the oxidized Sodium Alginate reflected with calcium ions. Their biological performances were investigated by testing swelling ratio, compression strength and degradation. The effects of oxidation degree and cross-linking density on the properties of calcium alginate were assessed. The results show the swelling ratios of samples were almost no effect whether modified or unmodified, furthermore modified calcium alginate had better degradation performance than unmodified.Lastly, oxidation may reduced the compression strength of samples,but increasing of ionically cross-linking density can enhance the mechanical strength.

scholarly journals Synthesis, Characterization, and Modeling of Nanotube Materials with Variable Stiffness Tethers

2004 ◽  
Vol 851 ◽  
Author(s):  
S. J. V. Frankland ◽  
M. N. Herzog ◽  
G. M. Odegard ◽  
T. S. Gates ◽  
C. C. Fay
Keyword(s):  
Carbon Nanotube ◽  
Young’S Modulus ◽  
Mechanical Testing ◽  
Storage Modulus ◽  
Young's Modulus ◽  
Base Material ◽  
Variable Stiffness ◽  
Cross Linking ◽  
The Cross

ABSTRACTSynthesis, mechanical testing, and modeling have been performed for a carbon nanotube material in which the nanotubes are functionalized with variable stiffness tethers (VST) capable of cross-linking the nanotubes. Tests using nanoindentation indicated a six-fold enhancement in the storage modulus when comparing the base material (the cross-linking agent with no nanotubes) to the composite (functionalized nanotube material) that contained 5.3 wt% of nanotubes. To understand how crosslinking the nanotubes may further alter the stiffness, a model of the system was constructed using nanotubes crosslinked with the VST. The model predicted that for a composite with 5 wt% nanotubes at random orientations, crosslinked with the VST, the bulk Young's modulus was reduced to 30% that of the non-crosslinked equivalent.

scholarly journals Effect of Loading and Functionalization of Carbon Nanotube on the Performance of Blended Polysulfone/Polyethersulfone Membrane during Treatment of Wastewater Containing Phenol and Benzene

Membranes ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 54 ◽  
Author(s):  
Mabusha S. Rameetse ◽  
Oluseyi Aberefa ◽  
Michael O. Daramola
Keyword(s):  
Thermal Stability ◽  
Carbon Nanotube ◽  
Mechanical Strength ◽  
Petroleum Industry ◽  
Absorption Capacity ◽  
Synthetic Wastewater ◽  
Separation Performance ◽  
Blended Polymer ◽  
And Performance ◽  
Pes Membrane

In this study, a carbon nanotube (CNT)-infused blended polymer membrane was prepared and evaluated for phenol and benzene removal from petroleum industry wastewater. A 25:75 (by weight %) blended polysulfone/polyethersulfone (PSF/PES) membrane infused with CNTs was prepared and tested. The effect of functionalization of the CNTs on the quality and performance of the membrane was also investigated. The membranes were loaded with CNTs at different loadings: 0.5 wt. %, 1 wt. %, 1.5 wt. % pure CNTs (pCNTs) and 1 wt. % functionalized CNTs (fCNTs), to gain an insight into the effect of the amount of CNT on the quality and performance of the membranes. Physicochemical properties of the as-prepared membranes were obtained using scanning electron microscopy (SEM) for morphology, Raman spectroscopy for purity of the CNTs, Fourier transform infrared (FTIR) for surface chemistry, thermogravimetric analysis (TGA) for thermal stability, atomic force microscopy (AFM) for surface nature and nano-tensile analysis for the mechanical strength of the membranes. The performance of the membrane was tested with synthetic wastewater containing 20 ppm of phenol and 20 ppm of benzene using a dead-end filtration cell at a pressure ranging from 100 to 300 kPa. The results show that embedding CNTs in the blended polymer (PSF/PES) increased both the porosity and water absorption capacity of the membranes, thereby resulting in enhanced water flux up to 309 L/m2h for 1.5 wt. % pCNTs and 326 L/m2h for 1 wt. % functionalized CNT-loaded membrane. Infusing the polysulfone/polyethersulfone (PSF/PES) membrane with CNTs enhanced the thermal stability and mechanical strength. Results from AFM indicate enhanced hydrophilicity of the membranes, translating in the enhancement of anti-fouling properties of the membranes. However, the % rejection of membranes with CNTs decreased with an increase in pCNTs concentration and pressure, while it increased the membrane with fCNTs. The % rejection of benzene in the pCNTs membrane decreased with 13.5% and 7.55% in fCNT membrane while phenol decreased with 55.6% in pCNT membrane and 42.9% in the FCNT membrane. This can be attributed to poor CNT dispersion resulting in increased pore sizes observed when CNT concentration increases. Optimization of membrane synthesis might be required to enhance the separation performance of the membranes.

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