Preparation of Binary Conductive Polymer Composites with Very Low Percolation Threshold by Latex Blending

2003 ◽  
Vol 24 (15) ◽  
pp. 889-893 ◽  
Author(s):  
Ji Wen Hu ◽  
Ming Wei Li ◽  
Ming Qiu Zhang ◽  
Ding Shu Xiao ◽  
Gen Shui Cheng ◽  
...  
Keyword(s):  
Percolation Threshold ◽  
Polymer Composites ◽  
Conductive Polymer ◽  
Conductive Polymer Composites

Novel conductive polymer composites based on poly(butylene terephtalate) filled with carbon fibers

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Liubov Bardash ◽  
Gisèle Boiteux ◽  
Gérard Seytre ◽  
Chady Hakme ◽  
Nicolas Dargère ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Percolation Threshold ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Conductive Polymer ◽  
Processing Conditions ◽  
Butylene Terephthalate ◽  
Conductive Polymer Composites ◽  
Cyclic Butylene Terephthalate ◽  
Conducting Polymer Composites

AbstractPoly(butylene terephthalate) (cPBT) synthesized from cyclic Butylene Terephthalate oligomers (CBT) was used as a matrix for carbon fibre (CF) conducting polymer composites (CPC). DSC, rheological studies and measurements of torque of CBT/CF were performed in order to optimise the processing conditions of CPC. DC and AC measurements were carried out for these composites and have shown a low percolation threshold for cPBT/CF.

scholarly journals Mechanically Enhanced Electrical Conductivity of Polydimethylsiloxane-Based Composites by a Hot Embossing Process

2018 ◽  
Author(s):  
Xiaolong Gao ◽  
Yao Huang ◽  
Xiaoxiang He ◽  
Xiaojing Fan ◽  
Ying Liu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Percolation Threshold ◽  
Polymer Composites ◽  
Flexible Electronics ◽  
Conductive Polymer ◽  
Hot Embossing ◽  
Electrical Percolation ◽  
Flexible Polymer ◽  
Conductive Polymer Composites ◽  
Conducting Filler

Electrically conductive polymer composites are in high demand for modern technologies, however, the intrinsic brittleness of conducting conjugated polymers and the moderate electrical conductivity of engineering polymer/carbon composites have highly constrained their applications. In this work, super high electrical conductive polymer composites were produced by a novel hot embossing design. The polydimethylsiloxane (PDMS) composites containing short carbon fiber (SCF) exhibited an electrical percolation threshold at 0.45 wt%, and reached a saturated electrical conductivity of 49 S/m at 8 wt% of SCF. When reduced the sample thickness from 1.0 mm to 0.1 mm by the hot embossing process, a compression-induced percolation threshold occurred at 0.3 wt%, while the electrical conductivity was further enhanced to 378 S/m at 8 wt% SCF. Furthermore, the additional of a second nanofiller of 1 wt%, such as carbon nanotube or conducting carbon black further increased the electrical conductivity of the PDMS/SCF (8 wt%) composites to 909 S/m and 657 S/m, respectively. The synergy of the densified conducting filler network by the mechanical compression and the hierarchical micro-/nanoscale filler approach has realize super high electrical conductive yet mechanical flexible polymer composites for modern flexible electronics applications.

Reduced percolation threshold of multi-walled carbon nanotubes/polymer composites by filling aligned ferromagnetic particles

2019 ◽  
Vol 31 (2) ◽  
pp. 187-197
Author(s):  
Shuai Dong ◽  
Xuan Wu ◽  
Erhua Wang ◽  
Xiaojie Wang
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Resistivity ◽  
Electrical Properties ◽  
Percolation Threshold ◽  
Polymer Composites ◽  
Conductive Polymer ◽  
Iron Particles ◽  
Conductive Polymer Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Conductive polymer composites, consisting of multi-walled carbon nanotubes and a small amount of carbonyl iron particles, are fabricated under an ordinary magnetic field, to form anisotropic microstructures. The alignment of carbonyl iron particles will change the structure of a multi-walled carbon nanotube network and consequently the electrical properties of conductive polymer composites. In this research, we focus on the effect of the anisotropic microstructures on the electrical properties of the composites, especially on the percolation threshold and electrical resistivity. Monte Carlo simulations for three-dimensional stick percolation systems are performed to predict the percolation threshold of the anisotropic conductive polymer composites in terms of orientation distribution of multi-walled carbon nanotubes. In addition, an eight-chain model is proposed to investigate the influence of the anisotropic distribution of multi-walled carbon nanotubes on the electrical resistivity of the composites. It is predicted that the percolation threshold could be reduced from 0.70 vol% for the isotropic composites to 0.49 vol% for the anisotropic composites. Meanwhile, the electrical resistivity of the anisotropic composites is about 10%–20% of that of the isotropic composites when the volume fraction of multi-walled carbon nanotubes is higher than the percolation threshold. The simulation results are compared with the experimental study results that show a very similar behavior although there are some deviations in the values.

scholarly journals Mechanically Enhanced Electrical Conductivity of Polydimethylsiloxane-Based Composites by a Hot Embossing Process

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 56 ◽  
Author(s):  
Xiaolong Gao ◽  
Yao Huang ◽  
Xiaoxiang He ◽  
Xiaojing Fan ◽  
Ying Liu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Percolation Threshold ◽  
Polymer Composites ◽  
Flexible Electronics ◽  
Conductive Polymer ◽  
Hot Embossing ◽  
Electrically Conductive ◽  
Electrical Percolation ◽  
Flexible Polymer ◽  
Conductive Polymer Composites

Electrically conductive polymer composites are in high demand for modern technologies, however, the intrinsic brittleness of conducting conjugated polymers and the moderate electrical conductivity of engineering polymer/carbon composites have highly constrained their applications. In this work, super high electrical conductive polymer composites were produced by a novel hot embossing design. The polydimethylsiloxane (PDMS) composites containing short carbon fiber (SCF) exhibited an electrical percolation threshold at 0.45 wt % and reached a saturated electrical conductivity of 49 S/m at 8 wt % of SCF. When reducing the sample thickness from 1.0 to 0.1 mm by the hot embossing process, a compression-induced percolation threshold occurred at 0.3 wt %, while the electrical conductivity was further enhanced to 378 S/m at 8 wt % SCF. Furthermore, the addition of a second nanofiller of 1 wt %, such as carbon nanotube or conducting carbon black, further increased the electrical conductivity of the PDMS/SCF (8 wt %) composites to 909 S/m and 657 S/m, respectively. The synergy of the densified conducting filler network by the mechanical compression and the hierarchical micro-/nano-scale filler approach has realized super high electrically conductive, yet mechanically flexible, polymer composites for modern flexible electronics applications.

scholarly journals Miniaturization effect of electroosmotic self-propulsive microswimmer powered by biofuel cell

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Toshiro Yamanaka ◽  
Fumihito Arai
Keyword(s):  
Theoretical Model ◽  
Femtosecond Laser ◽  
Polymer Composites ◽  
Open Circuit Potential ◽  
Vascular System ◽  
Conductive Polymer ◽  
Open Circuit ◽  
Biofuel Cell ◽  
Remarkable Feature ◽  
Conductive Polymer Composites

AbstractFor future medical microrobotics, we have proposed the concept of the electroosmotic self-propulsive microswimmer powered by biofuel cell. According to the derived theoretical model, its self-propulsion velocity is inversely proportional to the length of the microswimmer, while it is proportional to the open circuit potential generated by the biofuel cell which does not depend on its size. Therefore, under conditions where those mechanisms work, it can be expected that the smaller its microswimmer size, the faster its self-propulsion velocity. Because of its remarkable feature, this concept is considered to be suitable as propulsion mechanisms for future medical microrobots to move inside the human body through the vascular system, including capillaries. We have already proved the mechanisms by observing the several 10 μm/s velocity of 100 μm prototypes fabricated by the optical photolithography using several photomasks and alignment steps. However, the standard photolithography was not suitable for further miniaturization of prototypes due to its insufficient resolution. In this research, we adopted femtosecond-laser 3D microlithography for multi-materials composing of the conductive polymer composites and nonconductive polymer composite and succeeded in fabricating 10 μm prototypes. Then we demonstrated more than 100 μm/s velocity of the prototype experimentally and proved its validity of the smaller and faster feature.

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