scholarly journals Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets on the Monotonic and Fatigue Properties of Uncracked and Cracked Epoxy Composites

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1895 ◽  
Author(s):  
Yi-Ming Jen ◽  
Jui-Cheng Huang ◽  
Kun-Yang Zheng
Keyword(s):  
Mechanical Properties ◽  
Synergistic Effect ◽  
Load Transfer ◽  
Fatigue Properties ◽  
Integrated Analysis ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Cracked Specimens ◽  
Path Bifurcation

The fatigue properties of the polymer nanocomposites reinforced with a hybrid nano-filler system have seldom studied before. Accordingly, epoxy nanocomposites with various multi-walled carbon nanotube (MWCNT)/graphene nanoplatelet (GNP) filler ratios were prepared to study comprehensively the synergistic effect of the hybrid nano-fillers on the monotonic and cyclic mechanical properties of the nanocomposites. The quasi-statically tensile properties and fatigue-life curves were experimentally determined using uncracked bulk specimens. Additionally, pre-cracked specimens were utilized to study the fracture toughness and fatigue crack growth rate of the nanocomposites. A synergistic index based on the properties of the nanocomposites with individual types of filler was proposed to evaluate the synergistic effect of two employed nano-fillers on the studied properties. The index was verified to be a highly discriminatory tool to evaluate the synergistic effect of hybrid nano-fillers on the studied mechanical properties. The experimental results show that the composites with a MWCNT:GNP ratio of 1:9 have the higher monotonic and fatigue properties than those with other filler ratios. Adding appropriate amount of CNTs can prevent the agglomeration of GNPs. The flexible CNTs bridge adjacent GNPs to constitute a favorable network for load transfer. Moreover, there is a linear relationship between the static and fatigue strengths of the studied nanocomposites. Integrated analysis of experimental data and a fracture surface study reveals that the dispersion of nano-fillers influences the mechanical properties significantly. The crack deflection effect due to the path bifurcation caused by encountering the filler cluster and the filler bridging effect are the main reinforcement mechanism of the studied properties.

Morphology, Structure and Properties of Electrospun Multi-Walled Carbon Nanotube/Polysulfonamide Composite Nanofibers

2015 ◽  
Vol 10 (1) ◽  
pp. 155892501501000 ◽  
Author(s):  
Bin-Jie Xin ◽  
Wenjie Chen
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Composite Nanofibers ◽  
Electrospun Fibers ◽  
Structure And Properties ◽  
Excellent Thermal Stability ◽  
Multi Walled Carbon Nanotube ◽  
Composite Nanofiber ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this paper, the morphology, structure and properties of electrospun Polysulfonamide (PSA)/multi-walled carbon nanotubes (MWCNTs) fibers are investigated systematically. The experimental results indicate that the diameter of electrospun PSA fiber increased by the blending of MWCNTs while its crystallinity decreased. Both the conductivity and mechanical properties of PSA/MWCNT fibers were improved by the blending of MWCNTs at a concentration below 5% MWCNT. The thermal behavior of the electrospun fibers was influenced by the MWCNT concentrations through the Thermogravimetric Analysis (TGA). The new developed PSA/MWCNTs composite nanofiber has excellent thermal stability and mechanical properties compared with the usual PSA fibers.

Effects of Multi-Walled Carbon Nanotubes (MWCNTS) on the Mechanical and Thermal Properties of Plasticized Polylactic Acid Nanocomposites

2013 ◽  
Vol 812 ◽  
pp. 181-186 ◽  
Author(s):  
Maizatulnisa Othman ◽  
Kok Hui Tan ◽  
Hashim Mohd Yusof ◽  
Khalid Halisanni ◽  
Ghazali Ruzaidi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polylactic Acid ◽  
Flexural Properties ◽  
Mechanical And Thermal Properties ◽  
Dynamic Mechanical Analyzer ◽  
Roll Mill ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A multi-walled carbon nanotube (MWCNT)/plasticized polylactic acid (PLA) composite was prepared using a two-roll mill set at 170°C and 50 rev/min. The material was characterized using dynamic mechanical analyzer (DMA). Characterization works include obtaining mechanical properties, such as tensile and flexural properties of the nanocomposites. Polyethylene glycol (PEG) at 6 wt% was used as the plasticizer for blending with the PLA. It was found that the tensile and flexural strengths of the nanocomposites increased up to 43.8 MPa and 81.4 MPa respectively with the addition of 0.15 wt% MWCNTs. The DMA results revealed that the storage modulus and the glass transition temperature (Tg) of the nanocomposites improved with the addition of 0.15 wt% CNTs, which was previously reduced by the incorporation of PEG.

Effects of multi-walled carbon nanotube structures on the electrical and mechanical properties of silicone rubber filled with multi-walled carbon nanotubes

2015 ◽  
Vol 3 (21) ◽  
pp. 5573-5579 ◽  
Author(s):  
Yuling Li ◽  
Mingjun Li ◽  
Minglei Pang ◽  
Shengyu Feng ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Specific Surface ◽  
Surface Area ◽  
Silicone Rubber ◽  
Multi Walled Carbon Nanotube ◽  
Key Factor ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The specific surface area is a key factor that determines both the electrical and mechanical properties of silicone rubber/MWCNTs.

scholarly journals Microstructure and mechanical properties of MWCNT/Ti6Al4V composites consolidated by vacuum sintering

2020 ◽  
Vol 52 (2) ◽  
pp. 187-194 ◽  
Author(s):  
Doan Phuong ◽  
Duong Van ◽  
Nguyen Ngoc ◽  
Pham Van
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Load Transfer ◽  
Ti6al4v Alloy ◽  
Matrix Composites ◽  
Vacuum Sintering ◽  
Alloy Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Load Transfer Effect ◽  
Walled Carbon Nanotubes

Ti6Al4V alloys with low weight, high corrosion resistance, high melting point, high biocompatibility and unique mechanical properties have been receiving great attention for wide applicability in many industry fields such as automobiles, aerospace and biomedical. However, Ti6Al4V tends to be easily oxidized at high temperature, exhibit low thermal conductivity, low hardness and low yield strength and thus have led to the limitation of applicability in many industries. In this study, we have fabricated Ti6Al4V matrix composites reinforced with multi-walled carbon nanotubes (MWCNT) to enhance the hardness and yield strength. Vacuum sintering technique has been used to prepare MWCNT/Ti6Al4V composites. Microstructural and phase studies indicated that the composite structure consists of two main phases including ?-Ti and ?-Ti and MWCNTs were uniformly dispersed in Ti6Al4V matrix. The relative density of composite decreases as the CNT content increases as resulted from the porous structure of the CNT, which limits the aggregation process of the composite. When the CNT content increased, the hardness and yield strength of the composite increased, reaching maximum values of 378 HV and 356 MPa with 2 vol.% MWCNTs, which are nearly 16 and 38% higher than those of Ti6Al4V alloy. The enhancement in hardness and compressive strength is attributed to the good mechanical properties of MWCNTs and load transfer effect from Ti6Al4V alloy matrix to reinforcement material.

Mechanical, thermo-mechanical and thermal characteristics of multi-walled carbon nanotubes-added textile-reinforced composites

2019 ◽  
Vol 50 (5) ◽  
pp. 692-715 ◽  
Author(s):  
Hande Sezgin ◽  
Rajesh Mishra ◽  
Jiri Militky ◽  
Omer Berk Berkalp
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Composite Structures ◽  
Reinforced Composites ◽  
Multi Walled Carbon Nanotube ◽  
Different Types ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The influence of adding different types of multi-walled carbon nanotubes on mechanical (tensile strength and impact strength), thermo-mechanical (storage modulus, loss modulus and damping factor) and thermal properties (thermogravimetric and differential scanning calorimetry analysis) of fabric-reinforced polyester-based composite structures are analyzed in this study. Jute, E-glass and carbon fabrics are preferred as the reinforcement materials. Four-plied fabric-reinforced composites are fabricated using vacuum-assisted resin transfer molding technique. Results indicate that adding different types of multi-walled carbon nanotubes have increasing effect on mechanical and thermo-mechanical properties of composite structures; however, they have barely effect on thermal properties. Pristine multi-walled carbon nanotube-added specimens show higher mechanical and thermo-mechanical properties compared to functionalized multi-walled carbon nanotube-added samples.

Mechanical Properties and Toughening Mechanisms of Multi-Walled Carbon Nanotube Reinforced Yttria-Stabilized Zirconia Composite

2014 ◽  
Vol 1052 ◽  
pp. 24-27
Author(s):  
Lv Zhang ◽  
Wei Wei Liu ◽  
Yao Chen
Keyword(s):  
Mechanical Properties ◽  
Yttria Stabilized Zirconia ◽  
Sintering Process ◽  
Stabilized Zirconia ◽  
Toughening Mechanisms ◽  
Plasma Sintering ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Spark Plasma ◽  
Walled Carbon Nanotubes

Yttria-stabilized zirconia (YSZ) reinforced with multi-walled carbon nanotubes (MWCNTs) is fabricated through spark plasma sintering (SPS). Raman spectroscopy corroborated that MWCNTs survived the harsh sintering process. The MWCNT/YSZ composite exhibits ~ 34% improvement in fracture toughness as compared to YSZ. Grain refinement, MWCNT pullout and crack bridging are the major toughening mechanisms.

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