scholarly journals Nanofiller Dispersion, Morphology, Mechanical Behavior, and Electrical Properties of Nanostructured Styrene-Butadiene-Based Triblock Copolymer/CNT Composites

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1831 ◽  
Author(s):  
Ulrike Staudinger ◽  
Bhabani K. Satapathy ◽  
Dieter Jehnichen
Keyword(s):  
Triblock Copolymer ◽  
Functional Materials ◽  
Volume Resistivity ◽  
Processing Parameters ◽  
Melt Mixing ◽  
Multiwalled Carbon ◽  
Soft Phase ◽  
Strain Behavior ◽  
Melt Compounding ◽  
Linear Triblock Copolymer

A nanostructured linear triblock copolymer based on styrene and butadiene with lamellar morphology is filled with multiwalled carbon nanotubes (MWCNTs) of up to 1 wt% by melt compounding. This study deals with the dispersability of the MWCNTs within the nanostructured matrix and its consequent impact on block copolymer (BCP) morphology, deformation behavior, and the electrical conductivity of composites. By adjusting the processing parameters during melt mixing, the dispersion of the MWCNTs within the BCP matrix are optimized. In this study, the morphology and glass transition temperatures (Tg) of the hard and soft phase are not significantly influenced by the incorporation of MWCNTs. However, processing-induced orientation effects of the BCP structure are reduced by the addition of MWCNT accompanied by a decrease in lamella size. The stress-strain behavior of the triblock copolymer/MWCNT composites indicate higher Young’s modulus and pronounced yield point while retaining high ductility (strain at break ~ 400%). At a MWCNT content of 1 wt%, the nanocomposites are electrically conductive, exhibiting a volume resistivity below 3 × 103 Ω·cm. Accordingly, the study offers approaches for the development of mechanically flexible functional materials while maintaining a remarkable structural property profile.

Synthesis and Characterization of Amphiphilic Multiwalled Carbon Nanotubes Based on Linear Triblock Copolymer

2014 ◽  
Vol 915-916 ◽  
pp. 732-741
Author(s):  
Bo Lin
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Triblock Copolymer ◽  
Synthesis And Characterization ◽  
Cleavage Reaction ◽  
Multiwalled Carbon ◽  
Characteristic Group ◽  
Linear Triblock Copolymer ◽  
Good Agreement

Amphiphilic multiwalled carbon nanotubes PMAA-g-MWCNT-g-PSt were prepared by grafting linear triblock copolymer PtBMA100-b-PGMA19-b-PSt101 onto the carboxyl multiwalled carbon nanotubes surface with an oxirane cleavage reaction. The ratio of intensity between D band and G band and the shifting of these bands in Raman spectroscopy showed good agreement with fourier transform infrared spectroscopy especially the appearance of the characteristic group of benzene ring at 673 cm-1 for PMAA-g-MWCNT-g-PSt. Thermogravimetric analysis showed that the contents of polymer grafted on the surface of carboxyl multiwalled carbon nanotubes were 36 % and 55 % for PMAA-g-MWCNT-g-PSt and PtBMA-g-MWCNTs-g-PDMAEMA, respectively. The introduction of the cinnamic group into PtBMA100-b-PGMA19-b-PSt101 induced the activation energy of PMAA-g-MWCNT-g-PSt much higher than that of PtBMA-g-MWCNTs-g-PDMAEMA after 238 oC during their thermal decompositions.

Relationship between processing and electrical properties in SEBS/CNT nanocomposites

2016 ◽  
Vol 49 (4) ◽  
pp. 356-367 ◽  
Author(s):  
Paulina Latko ◽  
Mateusz Bielecki ◽  
Rafał Kozera ◽  
Anna Boczkowska
Keyword(s):  
Electrical Conductivity ◽  
Rotational Speed ◽  
Triblock Copolymer ◽  
Mixing Time ◽  
Processing Temperature ◽  
Mixing Process ◽  
Melt Mixing ◽  
Multiwalled Carbon ◽  
The Relationship ◽  
Selection Of

This article describes nanocomposites of triblock copolymer styrene–ethylene/butylene–styrene doping with 5 wt% of multiwalled carbon nanotubes (CNTs) prepared by melt mixing process. The selection of processing temperature was made according to the state of macrodispersion of CNTs within polymer matrix. Afterwards, the relationship between rotational speed, mixing time and electrical conductivity has been noted. It was confirmed that the temperature of 300°C and rotational speed of 100 r/min lead to significant decreasing of CNT agglomerations resulting in high electrical conductivity equal to 8.0 S/m.

scholarly journals Polyamide 12/Multiwalled Carbon Nanotube and Carbon Black Nanocomposites Manufactured by 3D Printing Fused Filament Fabrication: A Comparison of the Electrical, Thermoelectric, and Mechanical Properties

2021 ◽  
Vol 7 (2) ◽  
pp. 38
Author(s):  
Nectarios Vidakis ◽  
Markos Petousis ◽  
Lazaros Tzounis ◽  
Emmanuel Velidakis ◽  
Nikolaos Mountakis ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Carbon Black ◽  
Large Scale ◽  
Fracture Mechanisms ◽  
Fused Filament Fabrication ◽  
Melt Mixing ◽  
Multiwalled Carbon ◽  
Electrically Conductive ◽  
Polyamide 12

In this study, nanocomposites with polyamide 12 (PA12) as the polymer matrix and multiwalled carbon nanotubes (MWCNTs) and carbon black (CB) at different loadings (2.5, 5.0, and 10.0 wt.%) as fillers, were produced in 3D printing filament form by melt mixing extrusion process. The filament was then used to build specimens with the fused filament fabrication (FFF) three-dimensional (3D) printing process. The aim was to produce by FFF 3D printing, electrically conductive and thermoelectric functional specimens with enhanced mechanical properties. All nanocomposites’ samples were electrically conductive at filler loadings above the electrical percolation threshold. The highest thermoelectric performance was obtained for the PA12/CNT nanocomposite at 10.0 wt.%. The static tensile and flexural mechanical properties, as well as the Charpy’s impact and Vickers microhardness, were determined. The highest improvement in mechanical properties was observed for the PA12/CNT nanocomposites at 5.0 wt.% filler loading. The fracture mechanisms were identified by fractographic analyses of scanning electron microscopy (SEM) images acquired from fractured surfaces of tensile tested specimens. The nanocomposites produced could find a variety of applications such as; 3D-printed organic thermoelectric materials for plausible large-scale thermal energy harvesting applications, resistors for flexible circuitry, and piezoresistive sensors for strain sensing.

Mechanical and thermal properties of TPU-toughened PBT/CNT nanocomposites

2018 ◽  
Vol 32 (6) ◽  
pp. 815-830 ◽  
Author(s):  
Ata Chalabi Tehran ◽  
Karim Shelesh-Nezhad ◽  
Farshid Javidi Barazandeh
Keyword(s):  
Storage Modulus ◽  
Thermoplastic Polyurethane ◽  
Crystallization Rate ◽  
Degree Of Crystallinity ◽  
Mechanical And Thermal Properties ◽  
Melt Mixing ◽  
Multiwalled Carbon ◽  
Melt Temperature ◽  
Nucleation Effect ◽  
The Degree Of Crystallinity

This research studies the properties of poly (butylene terephthalate) (PBT)-based systems toughened with thermoplastic polyurethane (TPU; 10, 20, and 30 wt%) and reinforced with multiwalled carbon nanotubes (CNTs; 0.1, 0.2, and 0.3 wt%). Different compositions prepared via melt mixing. Morphology studies showed good compatibility between the two polymeric phases in PBT/TPU. The addition of TPU to PBT reduced crystallization rate and melt temperature, while inclusion of CNTs had nucleation effect and increased the degree of crystallinity, crystallization, and melt temperatures. The existence of TPU in PBT caused significant enhancement in notch-impact resistant. The inclusion of CNTs to PBT/TPU blend led to the substantial improvements in tensile and flexural strengths and moduli. Dynamic mechanical thermal analysis revealed that the incorporation of CNTs into PBT/TPU enhanced storage modulus and heightened glass transition temperature. The storage modulus of PBT/TPU/CNT nanocomposite containing 0.5 wt% CNT was comparable with that of pure PBT particularly at high temperatures.

The Mechanical Properties of Combustion-Sprayed Polymers and Blends

1996 ◽  
Author(s):  
J.A. Brogan ◽  
C.C. Berndt ◽  
A. Claudon ◽  
C. Coddet
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Strength ◽  
Deposition Temperature ◽  
Processing Parameters ◽  
Low Energy ◽  
Melt Compounding ◽  
Acid Copolymer ◽  
Spray Processing ◽  
Break Water

Abstract The mechanical properties of EMAA copolymer are dependent upon the thermal spray processing parameters. The parameters determine coating temperatures which, in turn, affects the microstructure. If the deposition temperature is too low, (104 °C for PFl 13 and 160 °C for PFl 11) coatings have low strengths and low energy to break values. Increased coating temperatures allow the particles to fully coalesce resulting in maximized strength and elongation to break. However, at 271 °C, PFl 11 had visible porosity which decreased both strength and elastic modulus. Pigment acts as reinforcement in the sense that the modulus increased but the elongation to break decreased, thus reducing the energy to break. Water quenching reduces the elastic modulus and yield strength, but increases the elongation to break for both EMAA formulations. The mechanical properties of post consumer commingled plastic and PCCP / EMMA blends improved if the recycled plastic was pre-processed by melt-compounding. Melt compounding increased the strength and toughness by improving the compatibility among the various polymer constituents. The addition of PCCP increases the modulus and yield strength of ethylene methaciylic acid copolymer.

Effect of different filler reinforcement on poly-ether-ether-ketone based nanocomposites for bearing applications

2020 ◽  
Vol 54 (29) ◽  
pp. 4709-4722
Author(s):  
Jennifer Vinodhini ◽  
Mohan Kumar Pitchan ◽  
Shantanu Bhowmik ◽  
Gion Andrea Barandun ◽  
Pierre Jousset
Keyword(s):  
High Performance ◽  
Morphological Properties ◽  
Multiwalled Carbon ◽  
Melt Compounding ◽  
Transmission Electron ◽  
High Performance Polymer ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Filler Reinforcement ◽  
Ether Ketone

This study investigates the effect of dispersion of nanofiller reinforcement high performance polymer matrix to enhance the thermo-mechanical properties for bearing application. Polyetheretherketone (PEEK) matrix is reinforced with acid fucntionalized multiwalled carbon nanotubes ( f-MWCNTs) and similar matrix was then reinforced with nano tungsten carbide (nano WC) to comparatively present their mechanical, thermal and morphological properties. The Nanocomposites were prepared via melt compounding method followed by injection moulding technique. The PEEK/ f-MWCNT s nanocomposite exhibited better property enhancement than the PEEK/nano WC. Spectroscopical analysis confirmed the effectiveness of improved interfacial adhesion between PEEK and f-MWCNTs. Transmission Electron Microscope (TEM) micrograph depicted improved dispersion of f-MWCNTs in PEEK matrix than that of nano WC. Due to improved interfacial interaction between f-MWCNT s and PEEK, this resulting nanocomposite showed better mechanical, thermal and morphological properties than PEEK/nano WC. Due to ceramic nature of nano WC and higher density difference the agglomeration of particles occurred leading to lower properties.

scholarly journals Pico- to nanosecond pulsed laser-induced forward transfer (LIFT) of silver nanoparticle inks: a comparative study

2019 ◽  
Vol 125 (12) ◽  
Author(s):  
J. Mikšys ◽  
G. Arutinov ◽  
G. R. B. E. Römer
Keyword(s):  
Surface Area ◽  
Silver Nanoparticle ◽  
Laser Fluence ◽  
Printed Electronics ◽  
Functional Materials ◽  
Picosecond Laser ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Forward Transfer ◽  
Nanoparticle Inks

Abstract Silver nanoparticle inks are among the key functional materials used in printed electronics. Depositing it by laser-induced forward transfer remains a challenging task because the non-linear rheological nature of these inks narrows the range of the laser processing parameters. Understanding, therefore, the influence of the laser parameters on the ejection dynamics and deposition quality is of critical importance. The influence of the laser pulse duration from pico- to nanosecond-laser-induced jet dynamics was investigated using time-resolved shadowgraphy imaging. Jet speed and surface area analyses showed that in the lower laser fluence level range, picosecond pulses induce higher surface area ejections which propagate at higher velocities. As the laser fluence levels were increased, the difference in jet velocity and surface area evolutions narrows. Deposition analysis showed a similar behavior with lower transfer thresholds and larger depositions at lower fluence range when picosecond-laser pulses were used.

Dynamic Vulcanization of NR/PCL Blends: Effect of Rotor Speed on Morphology, Tensile Properties and Tension Set

2019 ◽  
Vol 798 ◽  
pp. 337-342 ◽  
Author(s):  
Chanchai Thongpin ◽  
Theeraphat Tanprasert
Keyword(s):  
Young’S Modulus ◽  
Shear Force ◽  
Young's Modulus ◽  
Tensile Behavior ◽  
Rotor Speed ◽  
Melt Mixing ◽  
Dynamic Vulcanization ◽  
Strain Behavior ◽  
Phase Size ◽  
Sem Micrograph

This work aimed to study effect of rotor speed during melt mixing of natural rubber/polycaprolactone (NR/PCL) on the morphology which controls mechanical properties of dynamic vulcanizate using Luperox101 as a curing agent in NR component. The rotor speeds at 60 and 80 rpm were compared. The morphology of NR/PCL vulcanizates elucidated from SEM micrograph showed that the vulcanizates exhibited NR paticles dispersed in PCL matrix. In addition, the phase size of dispersed NR should be smaller with increasing rotor speed due to the increased shear force. This large PCL domain induced stronger strain hardening in stress-strain behavior under tension. This behavior is closed to tensile behavior of PCL and appeared at the vulcanizates. In terms of modulus, Young’s modulus was concentrated and reported. The lower degradation of PCL phase during melt mixing in the vulcanizates prepared from melt mixing at rotor speed of 60 rpm was responsible for higher Young‘s modulus than that prepared from rotor speed of 80 rpm. The tension set of NR/PCL vulcanizates prepared with rotor speed of 60 was higher than that with rotor speed of 80 rpm. It was suggested by Nakason et.al. [1] that the tension set of vulcanizates should be lower than 50 % so that they could be applied for thermoplastic vulcanizates. In this system, tension set values of the vulcanizates containing PCL 30-45 wt.% were lower than 50% in both rotor speed conditions.

Dispersion of Wood Microfibers in a Matrix of Thermoplastic Starch and Starch–Polylactic Acid Blend

2007 ◽  
Vol 1 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Ayan Chakraborty ◽  
Mohini Sain ◽  
Mark Kortschot ◽  
Sean Cutler
Keyword(s):  
Polylactic Acid ◽  
Polymer System ◽  
Cellulose Fibers ◽  
Thermoplastic Starch ◽  
Processing Parameters ◽  
Percentage Increase ◽  
Melt Mixing ◽  
Cellulose Microfibers ◽  
Solution Cast ◽  
Microscopy Images

The successful dispersion of cellulose fibers of submicrometer diameter in polymers has been restricted to solution-cast films so far. In this work, the dispersion of microfibers in biopolymers was investigated by melt-mixing using conventional processing equipment. Thermoplastic starch and a blend of starch and polylactic acid (PLA) were used as matrix materials. A suspension of cellulose microfibers less than 1 μm in diameter was prepared in water. This microfiber suspension was poured into molten thermoplastic starch to obtain fiber loadings up to 2%. The composites were compression molded into thin films roughly 0.25 mm thick. there was a 10% increase in tensile strength and a 50% increase in stiffness with each percentage increase in microfiber loading in the starch polymer. Similar improvement in tensile properties was also noted for a polymer system prepared by blending starch and PLA. Laser confocal microscopy images were analyzed to quantify microfiber dispersion at different composite processing parameters. This was the first work where successful dispersion of cellulose fibers of submicrometer was achieved in a composite prepared solely by the melt-mixing process.

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