Understanding the effect of processing temperature and carbon nanotube addition on the viscoelastic response of polyurethane foams

2021 ◽  
pp. 51644
Author(s):  
Jasdeep Bhinder ◽  
Prabhat K. Agnihotri
Keyword(s):  
Carbon Nanotube ◽  
Polyurethane Foams ◽  
Processing Temperature ◽  
Viscoelastic Response

Single-walled carbon nanotube-derived novel structural material

2006 ◽  
Vol 21 (6) ◽  
pp. 1537-1542 ◽  
Author(s):  
Go Yamamoto ◽  
Yoshinori Sato ◽  
Toru Takahashi ◽  
Mamoru Omori ◽  
Toshiyuki Hashida ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Interfacial Strength ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Processing Temperature ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Plasma Sintering ◽  
Spark Plasma

Binder-free macroscopic single-walled carbon nanotube (SWCNT) solids were prepared by spark plasma sintering (SPS) of purified SWCNTs. The effects of processing temperatures and pressures on the mechanical properties of the SWCNT solids and structural change of SWCNTs in the SWCNT solids were investigated. Transmission electron microscope observation of the SWCNT solids revealed thatthe high-temperature treatment has transformed some part of the SWCNTs into amorphous-like structure and the rest of the SWCNTs remained buried into the above structure. The mechanical properties of the SWCNT solids increased with the increasing processing temperature, probably reflecting the improvement of interfacial strength between SWCNTs and disordered structure of carbon due to the spark plasma generated in the SPS process.

Fe Nano-Films Processed by Ammonia for the Catalyzed Growth of Aligned Carbon Nanotube Arrays

2011 ◽  
Vol 332-334 ◽  
pp. 1967-1973
Author(s):  
Yong Zhao ◽  
Xian Chen ◽  
Shuo Hou ◽  
Zai Kai Du ◽  
Guang Yang Mo ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Processing Time ◽  
Metal Vapor ◽  
Vacuum Arc ◽  
Nanotube Arrays ◽  
Processing Temperature ◽  
Analysis Software ◽  
Carbon Nanotube Arrays ◽  
Cnt Arrays ◽  
Si Wafer

Fe nano-films deposited on pure Si wafer by metal vapor vacuum arc (MEVVA) ion deposition system were annealed in hydrogen and then treated by ammonia at 750 °C for the catalyzed growth of aligned carbon nanotube (CNT) arrays. Influence of ammonia on the microstructures of Fe nano-films was analyzed by a field emission scanning electron microscopy (FESEM) and image analysis software. The microstructures of the post-processed Fe nano-films were found depending on the processing time of ammonia and the film thickness. Comparing the growth results of CNTs from 10 nm Fe films, we found that when the processing temperature was 750 °C, the optimum processing time of ammonia was about 10 to 12 min for 10 nm Fe films to catalyze the growth of aligned CNT arrays.

Electrical conductivity and major mechanical and thermal properties of carbon nanotube-filled polyurethane foams

2011 ◽  
Vol 120 (5) ◽  
pp. 3014-3019 ◽  
Author(s):  
Ding-Xiang Yan ◽  
Kun Dai ◽  
Zhi-Dong Xiang ◽  
Zhong-Ming Li ◽  
Xu Ji ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties

Active Cobalt Catalyst for Carbon Powder Growth: Sol-gel Process and Alcohol Catalytic CVD Technique

2020 ◽  
Vol 10 (1) ◽  
pp. 68-73
Author(s):  
Mohd. Asyadi Azam ◽  
Nor Najihah Zulkapli ◽  
Mohamad Huzaifa Mohd. Azman
Keyword(s):  
Carbon Nanotube ◽  
Cobalt Catalyst ◽  
Sol Gel ◽  
Cobalt Acetate ◽  
Carbon Powder ◽  
Processing Temperature ◽  
Actual Growth ◽  
Size Of Particles ◽  
Carbon Nanotube Growth ◽  
Catalytic Cvd

Introduction: The unique properties of carbon nanotubes trigger a lot of ideas to study the ability of the material in many fields. Experimental: The research started with the preparation of cobalt catalyst by using the sol-gel method, which used cobalt acetate tetrahydrate and 2-amino ethanol solvent, followed by the actual growth of carbon nanotube by using the prepared catalyst in alcohol catalytic CVD. Results: The crystal structure, microstructure, and size of particles of the resulting cobalt-based powders were characterized by using X-ray Diffraction, Optical Microscopy, and Particle Size Analyzer, followed by, carbon nanotube growth at 700, 750, 800, and 850°C, where other parameters were fixed in order to determine the effect of CVD processing and temperature on the quality of resulting carbonbased materials. The graphitic structure of the carbon-based materials was analyzed by using Raman Spectroscopy. Conclusion: It was found that the optimum CVD processing temperature was 850°C with IG/ID ratio of 1.052.

Viscoelastic response of high volume fraction carbon nanotube-polymer nanocomposites with tailored wettability and controlled morphology

2019 ◽  
Vol 208 ◽  
pp. 418-425 ◽  
Author(s):  
Z. Semih Pehlivan ◽  
Deniz Ürk ◽  
Hülya Cebeci ◽  
M. Lütfi Öveçoğlu ◽  
Abdullah Dönmez ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Polymer Nanocomposites ◽  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Viscoelastic Response ◽  
Controlled Morphology

Effect of carbon nanotube doping on the energy dissipation and rate dependent deformation behavior of polyurethane foams

2020 ◽  
pp. 0021955X2091728 ◽  
Author(s):  
Jasdeep Bhinder ◽  
Prabhat K. Agnihotri
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Energy Dissipation ◽  
Deformation Behavior ◽  
Foam Cell ◽  
Threshold Concentration ◽  
Polyurethane Foams ◽  
Rate Dependent ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes

An experimental investigation is performed to characterize the effect of carbon nanotubes on the average mechanical properties of polyurethane foams. Polyurethane foams are doped with as-grown and oxidized carbon nanotubes at varying carbon nanotube concentrations. It is observed that the inclusion of carbon nanotubes up to a threshold concentration decreases the density of freely expanding polyurethane foams. Uniaxial and cyclic compression testing of foam samples is carried out to study their energy dissipation and rate dependent deformation behavior. While energy dissipation is observed to be higher in neat polyurethane foams, carbon nanotube reinforced foams show better recovery when compressed beyond elastic limit due to their stiffer foam cell walls. It is shown that incorporation of oxidized carbon nanotubes should be preferred over as grown carbon nanotubes to improve flexural, thermal and acoustic response of polyurethane foams. Scanning electron microscopy analysis of compressed samples reveals that cell shearing; cell bending and fracture at nodes are the predominant mode of deformation in all foam samples.

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