scholarly journals Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1845
Author(s):  
Xingyao Liu ◽  
Rongxin Guo ◽  
Rui Li ◽  
Hui Liu ◽  
Zhengming Fan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Large Deformation ◽  
Large Strain ◽  
Deformation Monitoring ◽  
Resistance Strain ◽  
Multiwalled Carbon Nanotube ◽  
Strain Response ◽  
Multiwalled Carbon

The dispersion, electrical conductivities, mechanical properties and resistance–strain response behaviors of multiwalled carbon nanotube (MWCNT)/natural rubber (NR) composites synthesized by the different processing conditions are systematically investigated at both macro- and micro-perspectives. Compared with the solution and flocculation methods, the two roll method produced the best MWCNTs distribution since the materials are mixed by strong shear stress between the two rolls. An excellent segregated conductive network is formed and that a low percolation threshold is obtained (~1 wt.%) by the two roll method. Different from the higher increases in conductivity for the composites obtained by the solution and flocculation methods when the MWCNT content is higher than 3 wt.%, the composite prepared by the two roll method displays obvious improvements in its mechanical properties. In addition, the two roll method promotes good stability, repeatability, and durability along with an ultrahigh sensitivity (GFmax = 974.2) and a large strain range (ε = 109%). The ‘shoulder peak’ phenomenon has not been observed in the composite prepared by the two roll method, confirming its potential for application as a large deformation monitoring sensor. Moreover, a mathematical model is proposed to explain the resistance–strain sensing mechanism.

scholarly journals Resistance-strain sensitive rubber composites filled by multiwalled carbon nanotubes for structuraldeformation monitoring

2021 ◽  
Vol 11 ◽  
pp. 184798042110113
Author(s):  
Xingyao Liu ◽  
Rongxin Guo ◽  
Zhiwei Lin ◽  
Yang Yang ◽  
Haiting Xia ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Multiwalled Carbon Nanotubes ◽  
Resistance Strain ◽  
Multiwalled Carbon Nanotube ◽  
Strain Response ◽  
Rubber Composites ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Networks

In this article, multiwalled carbon nanotube/natural rubber composites with resistance-strain sensitivity were prepared by solution method, when the electrical percolation threshold of multiwalled carbon nanotube is only ∼3.5 wt%. The mechanical properties and resistance-strain response sensitivity were studied and analyzed systematically. The dispersion of multiwalled carbon nanotubes in the natural rubber matrix was characterized by field-emission scanning electron microscope and X-ray diffractometer. The composite exhibits good deformation sensitivity (gauge factor >27), large strain sensing range (>200%), and high signal stability when multiwalled carbon nanotube content was appropriate. The composite is suited to application in strain monitoring of large deformation structures since the resistance-strain response is more stable when strain exceeds 100%. To understand the mechanism of the resistance-strain response, the ‘shoulder peak’ of resistance-strain curve was researched and explained by the digital image correlation method, and an analytical model was developed when considering the effects of electronic tunneling and hopping in multiwalled carbon nanotube networks. Both experiment and analytical results confirm the break-restructure process of multiwalled carbon nanotube networks under applied strain cause the resistance-strain response. Finally, the practical application of the composite to monitoring strain load of rubber isolation bearing was realized.

Mechanical properties, thermal behaviors and oil resistance of epoxidized natural rubber/multiwalled carbon nanotube nanocomposites prepared via in situ epoxidation

2016 ◽  
Vol 49 (2) ◽  
pp. 99-119 ◽  
Author(s):  
Saowaroj Chuayjuljit ◽  
Piyaphorn Mungmeechai ◽  
Anyaporn Boonmahitthisud
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Multiwalled Carbon Nanotube ◽  
Epoxidized Natural Rubber ◽  
Multiwalled Carbon ◽  
Oil Resistance ◽  
In Situ Epoxidation

Epoxidized natural rubber (ENR)/multiwalled carbon nanotube (MWCNT) nanocomposites were prepared via in situ epoxidation of natural rubber (NR) using a molar ratio of formic acid/hydrogen peroxide to isoprene unit at 0.75/0.75 with five loadings of MWCNTs, ranging from 0.5–2.5 parts per hundred parts of rubber (phr), at 50°C for 4 h. Based on Fourier transform infrared spectra, the epoxide content of ENR in the nanocomposites was about 32.5–33.2 mole%. Accordingly, the products were referred to ENR30/MWCNT nanocomposites. The curing characteristics, mechanical properties (tensile properties, tear strength, and hardness), glass transition temperature ( Tg), thermal stability, and oil resistance of these in situ ENR30/MWCNT nanocomposites were investigated and compared with NR and neat ENR30. The results showed that the scorch and cure times of ENR30/MWCNT nanocomposites were the longest followed by NR and ENR30. The incorporation of an appropriate amount of MWCNTs into the in situ epoxidation apparently improved the properties of NR. Among them, the nanocomposites filled with 2 phr MWCNTs exhibited the highest mechanical properties, Tg, thermal stability, and oil resistance. The mechanical properties of the in situ nanocomposites were also compared with those of the control nanocomposites prepared by adding MWCNTs directly in the prepared ENR30 latex. It was found that at similar MWCNT loadings, the in situ nanocomposites exhibited higher mechanical properties than the control nanocomposites.

Electrical and mechanical properties of flexible multiwalled carbon nanotube/poly (dimethylsiloxane) based nanocomposite sheets

2021 ◽  
pp. 106550
Author(s):  
Leema Rose Viannie ◽  
N.R. Banapurmath ◽  
Manzoore Elahi M. Soudagar ◽  
Anilkumar V. Nandi ◽  
Nazia Hosain ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon

Structural and mechanical properties of free-standing multiwalled carbon nanotube paper prepared by an aqueous mediated process

2017 ◽  
Vol 52 (12) ◽  
pp. 7503-7515 ◽  
Author(s):  
Sushant Sharma ◽  
Bhanu Pratap Singh ◽  
Arun Singh Babal ◽  
Satish Teotia ◽  
Jeevan Jyoti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Free Standing ◽  
Multiwalled Carbon

scholarly journals Electrodeposition of Hydroxyapatite-Multiwalled Carbon Nanotube Nanocomposite on Ti6Al4V

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Thom T. Nguyen ◽  
Nam T. Pham ◽  
Thanh T. M. Dinh ◽  
Thu T. Vu ◽  
Hai S. Nguyen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Optimal Conditions ◽  
Electrodeposition Technique ◽  
Multiwalled Carbon ◽  
Structural Behaviors ◽  
Morphology And Mechanical Properties

This work aims to study the optimal conditions to synthesize hydroxyapatite-multiwalled carbon nanotube (HAp-MWCNT) coatings on Ti6Al4V by electrodeposition technique. The structural behaviors, morphology, and mechanical properties of the coatings were characterized by various advanced methods. The analyzed results showed that the obtained coatings were composed of hydroxyapatite (HAp) and multiwalled carbon nanotube (MWCNT) phases. The presence of MWCNTs in the HAp-MWCNT composite, which improved adhesion between the coatings and the substrate about 2.3 times, increased 20% of hardness and decreased about 40% the solubility of HAp-MWCNTs/Ti6Al4V in comparison with pure HAp coating on Ti6Al4V.

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