Highly Oriented Electrospun Conductive Nanofibers of Biodegradable Polymers-Revealing the Electrical Percolation Thresholds

2021 ◽  
Author(s):  
Muhammad A. Munawar ◽  
Dirk W. Schubert
Keyword(s):  
Biodegradable Polymers ◽  
Electrical Percolation ◽  
Percolation Thresholds

scholarly journals Attaining Toughness and Reduced Electrical Percolation Thresholds in Bio-Based PA410 by Combined Addition of Bio-Based Thermoplastic Elastomers and CNTs

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3420
Author(s):  
Itziar Otaegi ◽  
Nora Aranburu ◽  
Gonzalo Guerrica-Echevarría
Keyword(s):  
Electrical Conductivity ◽  
Thermoplastic Elastomers ◽  
Electrical Percolation ◽  
Mechanical And Electrical Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Electrical Percolation Threshold ◽  
Percolation Thresholds ◽  
Ductile Behavior ◽  
Walled Carbon Nanotubes ◽  
The Impact

Multi-walled carbon nanotubes (CNTs) were added to provide electrical conductivity to bio-based polymer blends with improved toughness (based on commercially available Pebax thermoplastic elastomers and bio-based polyamide 4,10). A preliminary study including three different Pebax grades was carried out to select the grade and the composition that would best improve the impact properties of PA410. Thus, tough multiphasic PA/Pebax/CNT nanocomposites (NCs) with enhanced electrical conductivity were obtained. The CNTs were added either: (1) in the form of pristine nanotubes or (2) in the form of a PA6-based masterbatch. Hence, PA410/Pebax/CNT ternary NCs and PA410/PA6/Pebax/CNT quaternary NCs were obtained, respectively, up to a CNT content of 1 wt%. The ternary and quaternary NCs both showed similar mechanical and electrical properties. The electrical percolation threshold decreased with respect to previously studied corresponding NCs without Pebax, i.e., PA410/CNT and PA410/PA6/CNT, due to the partial volume exclusion effect of Pebax over the CNTs that were dispersed mainly in the PA matrix; materials with percolation concentrations as low as 0.38 wt% were obtained. With respect to mechanical properties, contrary to the NCs without Pebax, all the PA/Pebax/CNT NCs showed a ductile behavior and impact strength values that were from three to five-fold higher than that of the pure PA410.

Rheological and electrical percolation thresholds of carbon nanotube/polymer nanocomposites

2012 ◽  
Vol 52 (10) ◽  
pp. 2173-2181 ◽  
Author(s):  
Christian Penu ◽  
Guo-Hua Hu ◽  
Amaia Fernandez ◽  
Philippe Marchal ◽  
Lionel Choplin
Keyword(s):  
Carbon Nanotube ◽  
Polymer Nanocomposites ◽  
Electrical Percolation ◽  
Percolation Thresholds

Electrical percolation in composites of conducting polymers and dielectrics

2015 ◽  
Vol 35 (8) ◽  
pp. 731-741 ◽  
Author(s):  
Andrzej Katunin ◽  
Katarzyna Krukiewicz
Keyword(s):  
Electrical Conductivity ◽  
Composite Material ◽  
Numerical Model ◽  
Conducting Polymers ◽  
Conducting Polymer ◽  
Manufacturing Cost ◽  
High Electrical Conductivity ◽  
Electrical Percolation ◽  
Percolation Thresholds ◽  
High Conductance

Abstract This article deals with the electrical conductivity of a composite of two polymers, one of which is a conducting polymer, whereas the second is a dielectric. The problem was formulated within the framework of electrical percolation, i.e., the percolation thresholds, which allow for a high electrical conductivity, is under investigation. For this purpose, a numerical model was developed, and its parameters were analyzed and discussed. Based on the determined thresholds, it was possible to evaluate the weight ratios of the conducting-dielectric polymers in a composite. The proposed approach allows for reducing the manufacturing cost of composite material with respect to conducting polymers with simultaneous retaining of high conductance properties of conducting polymers, as well as durability and flexibility of dielectrics.

scholarly journals Revealing Electrical and Mechanical Performances of Highly Oriented Electrospun Conductive Nanofibers of Biopolymers with Tunable Diameter

2021 ◽  
Vol 22 (19) ◽  
pp. 10295
Author(s):  
Muhammad A. Munawar ◽  
Dirk W. Schubert
Keyword(s):  
Storage Time ◽  
Molar Mass ◽  
High Molar Mass ◽  
Electrical Percolation ◽  
Filler Fraction ◽  
Percolation Thresholds ◽  
Conductive Fibers ◽  
Mechanical Performances ◽  
High Orientation ◽  
Significant Factors

The present study outlines a reliable approach to determining the electrical conductivity and elasticity of highly oriented electrospun conductive nanofibers of biopolymers. The highly oriented conductive fibers are fabricated by blending a high molar mass polyethylene oxide (PEO), polycaprolactone (PCL), and polylactic acid (PLA) with polyaniline (PANi) filler. The filler-matrix interaction and molar mass (M) of host polymer are among governing factors for variable fiber diameter. The conductivity as a function of filler fraction (φ) is shown and described using a McLachlan equation to reveal the electrical percolation thresholds (φc) of the nanofibers. The molar mass of biopolymer, storage time, and annealing temperature are significant factors for φc. The Young’s modulus (E) of conductive fibers is dependent on filler fraction, molar mass, and post-annealing process. The combination of high orientation, tunable diameter, tunable conductivity, tunable elasticity, and biodegradability makes the presented nanofibers superior to the fibers described in previous literature and highly desirable for various biomedical and technical applications.

Electrical Property of Carbon Nanotube/PMMA/PVAc Composite Film

2006 ◽  
Vol 11-12 ◽  
pp. 555-558
Author(s):  
Hong Mei Chai ◽  
Dong Lin Zhao ◽  
Zeng Min Shen
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Solution Casting ◽  
Electrical Percolation ◽  
Graphitized Carbon ◽  
Significant Difference ◽  
Conductive Fillers ◽  
Percolation Thresholds ◽  
Better Than

The carbon nanotube/PMMA/PVAc composite film was prepared by solution casting. The carbon nanotube (CNT) and graphitized carbon nanotube (GCNT) were employed as conductive fillers in the composite films. The conductivity of the GCNT/PMMA/PVAc film is better than that of CNT/PMMA/PVAc film. The electrical percolation thresholds were at 5wt% and 2wt% respectively in the CNT/PMMA/PVAc film and GCNT/PMMA/PVAc film. The volume electric resistivities of CNT/PMMA/PVAc and GCNT/PMMA/PVAc composite film are at 0.044⋅m and 0.007⋅m respectively at 15wt% carbon nanotube. The significant difference of resistivity for the both types of composite film was due to different structure and crystallinity of CNT and GCNT.

Insights to low electrical percolation thresholds of carbon-based polypropylene nanocomposites

Carbon ◽  
2021 ◽  
Vol 176 ◽  
pp. 602-631
Author(s):  
T. Khan ◽  
M.S. Irfan ◽  
M. Ali ◽  
Y. Dong ◽  
S. Ramakrishna ◽  
...  
Keyword(s):  
Electrical Percolation ◽  
Polypropylene Nanocomposites ◽  
Percolation Thresholds ◽  
Carbon Based

Electrical percolation thresholds of semiconducting single-walled carbon nanotube networks in field-effect transistors

2015 ◽  
Vol 17 (10) ◽  
pp. 6874-6880 ◽  
Author(s):  
Ho-Kyun Jang ◽  
Jun Eon Jin ◽  
Jun Hee Choi ◽  
Pil-Soo Kang ◽  
Do-Hyun Kim ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Network Density ◽  
Electrical Characteristics ◽  
Single Walled Carbon Nanotube ◽  
Electrical Percolation ◽  
Single Walled Carbon ◽  
Percolation Thresholds ◽  
Carbon Nanotube Networks

We related the network density of semiconducting single-walled carbon nanotube networks at the percolation threshold to their electrical characteristics.

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