Electrically conductive carbon nanofiber/polyethylene composite: effect of melt mixing conditions

2011 ◽  
Vol 22 (2) ◽  
pp. 246-253 ◽  
Author(s):  
Mohammed H. Al-Saleh ◽  
Uttandaraman Sundararaj
Keyword(s):  
Carbon Nanofiber ◽  
Mixing Conditions ◽  
Melt Mixing ◽  
Electrically Conductive ◽  
Composite Effect ◽  
Polyethylene Composite

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.

Preparation of Electrically Conductive Polystyrene/Carbon Nanofiber Nanocomposite Films

2008 ◽  
Vol 85 (8) ◽  
pp. 1105 ◽  
Author(s):  
Luyi Sun ◽  
Jonathan Y. O'Reilly ◽  
Chi-Wei Tien ◽  
Hung-Jue Sue
Keyword(s):  
Carbon Nanofiber ◽  
Nanocomposite Films ◽  
Electrically Conductive

Carbon black/poly(ethylene terephthalate)/polyethylene composite with electrically conductive in situ microfiber network

Carbon ◽  
2004 ◽  
Vol 42 (2) ◽  
pp. 428-432 ◽  
Author(s):  
Zhong-Ming Li ◽  
Xiang-Bin Xu ◽  
Ai Lu ◽  
Kai-Zhi Shen ◽  
Rui Huang ◽  
...  
Keyword(s):  
Carbon Black ◽  
Ethylene Terephthalate ◽  
Electrically Conductive ◽  
Polyethylene Composite ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

A Study on the Use of Graphene-PEEK Composites As High Temperature Adhesives: Mechanical Properties and Microwave Activation

2017 ◽  
Author(s):  
Andrew G. Littlefield ◽  
Stephen F. Bartolucci ◽  
Joshua A. Mauer
Keyword(s):  
High Temperature ◽  
Carbon Nanofiber ◽  
In Situ Polymerization ◽  
Weight Fraction ◽  
Major Effect ◽  
Conventional Heating ◽  
Adhesive Properties ◽  
Melt Mixing ◽  
Microwave Exposure ◽  
Lap Shear

Polyetheretherketone is a widely used engineering polymer that is especially suitable for high-temperature applications. Graphene is a two-dimensional form of carbon nanomaterial that has been studied extensively for its mechanical, electrical and thermal properties and its use as a filler in polymer matrices. Compounding graphene into polymers has the potential to improve various properties, even at very low concentrations. In this work, we have examined the incorporation of graphene nanoplatelets (GNP) into PEEK. We have fabricated composites using melt-mixing techniques, as well as by graphene functionalization and in-situ polymerization of the PEEK. In this way, we can compare the performance of the composites by two different processing methods. The GNP-PEEK composites were characterized by DSC, TGA, and SEM. Lap-shear joints using the GNP-PEEK as the adhesive were made and mechanically tested. Results show that the weight fraction of GNP has a major effect on the strength of the joint. In this work, we aim to produce a material that functions as a reusable high-temperature, thermoplastic adhesive, which can be activated by conventional heating methods, or by microwave heating. The GNPs act as microwave absorbers and heat the surrounding PEEK matrix to the point of melting, in contrast to the neat PEEK, which does not melt upon exposure to the microwaves under the same parameters. Additionally, we explore 3D printing methods to fabricate a lap shear joint, where the adherends are pure polymer and the adhesive region is a polylactic acid/carbon nanofiber (PLA/CNF) composite that can be activated by microwaves. We show that solid adherends can be bonded together when a solid PLA/CNF piece is placed between the adherends and melted by microwave exposure. The microwave absorption properties and adhesive properties will be discussed.

scholarly journals The Influence of the Blend Ratio in PA6/PA66/MWCNT Blend Composites on the Electrical and Thermal Properties

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 122 ◽  
Author(s):  
Beate Krause ◽  
Lisa Kroschwald ◽  
Petra Pötschke
Keyword(s):  
Crystallization Behavior ◽  
Volume Resistivity ◽  
Polyamide 6 ◽  
Mixing Conditions ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Electrically Conductive ◽  
Blend Ratio ◽  
Amorphous Phases ◽  
Heterogeneous Crystallization

It is known that the percolation threshold of polyamide 6 (PA6)/multiwalled carbon nanotube (MWCNT) composites is higher than that of PA66/MWCNT composites under the same mixing conditions and melt viscosity. A series of blends of PA6 and PA66 containing 1 wt % MWCNTs have been prepared to investigate this phenomenon. At contents up to 20 wt % PA66, the blends were not electrically conductive. The electrical resistivity dropped to 109 Ohm∙cm for PA66/PA6 30/70 blends. The resistivity was 105 Ohm∙cm at higher PA66 contents. Differential scanning calorimetry was used to investigate the thermal behavior of blends. The glass transition temperature was almost constant for all blend compositions, indicating that the amorphous phases are miscible. The MWCNT addition influenced the crystallization of PA66 much more than the PA6 crystallization. A heterogeneous crystallization of the polyamide in PA66/PA6 blends took place, and the MWCNTs were mainly localized in the earlier crystallizing PA66 phase. Thus, the formation of the nanotube network and thus the electrical volume resistivity of the PA6/PA66 blends with 1 wt % MWCNTs is significantly influenced by the crystallization behavior. In PA66/PA6 blends up to 60 wt %, the more expensive PA66 can be replaced by the cheaper PA6 while retaining its electrical properties.

Novel Electrically Conductive Porous PDMS/Carbon Nanofiber Composites for Deformable Strain Sensors and Conductors

2017 ◽  
Vol 9 (16) ◽  
pp. 14207-14215 ◽  
Author(s):  
Shuying Wu ◽  
Jin Zhang ◽  
Raj B. Ladani ◽  
Anil R. Ravindran ◽  
Adrian P. Mouritz ◽  
...  
Keyword(s):  
Carbon Nanofiber ◽  
Strain Sensors ◽  
Electrically Conductive
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