Double percolation and segregated structures formed in polymer alloy with excellent electrical conductivity

Carbon black (CB)-filled polypropylene (PP) with surface resistivity between 10 6 and 10 9 Ω sq −1 is the ideal antistatic plastic material in the electronics and electric industry. However, a large amount of CB may have an adverse effect on the mechanical properties and processing performance of the material, thus an improved ternary system is developed. Blends of CB-filled PP and polyamide 6 (PA6) have been prepared by melt blending in order to obtain electrically conductive polymer composites with a low electrical percolation threshold based on the concept of double percolation. The morphological developments of these composites were studied by scanning electron microscopy. The results showed that CB particles were selectively dispersed in PA6 phases due to the good interaction and interfacial adhesion between CB and PA6. At the same CB loadings, the surface resistivity of PP/PA6/CB composite was smaller than that of PP/CB composite system, which indicated the better conductivity in the former composite. The increasing amount of PA6 in the composites changed the morphology from a typical sea–island morphology to a co-continuous morphology. What is more, with 8 wt% of CB and PP/PA6 phase ratio of 70/30 in which the PP and PA6 phases formed a co-continuous structure, the electrical conductivity of the composite peaked at 2.01 × 10 5 Ω sq −1 .

Download Full-text

Construction and Mechanism Analysis of a Self-Assembled Conductive Network in DGEBA/PEI/HRGO Nanocomposites by Controlling Filler Selective Localization

Nanomaterials ◽

10.3390/nano11010228 ◽

2021 ◽

Vol 11 (1) ◽

pp. 228

Author(s):

Yiming Meng ◽

Sushant Sharma ◽

Wenjun Gan ◽

Seung Hyun Hur ◽

Won Mook Choi ◽

...

Keyword(s):

Electrical Conductivity ◽

Polymer Blend ◽

Chemical Reduction ◽

Dynamic Mechanical Properties ◽

Diglycidyl Ether ◽

Mechanism Analysis ◽

Dynamic Mechanical ◽

Curing Reaction ◽

Selective Localization ◽

Double Percolation

Herein, a feasible and effective approach is developed to build an electrically conductive and double percolation network-like structure via the incorporation of highly reduced graphene oxide (HRGO) into a polymer blend of diglycidyl ether of bisphenol A/polyetherimide (DGEBA/PEI). With the assistance of the curing reaction-induced phase separation (CRIPS) technique, an interconnected network of HRGO is formed in the phase-separated structure of the DGEBA/PEI polymer blend due to selective localization behavior. In this study, HRGO was prepared from a unique chemical reduction technique. The DGEBA/PEI/HRGO nanocomposite was analyzed in terms of phase structure by content of PEI and low weight fractions of HRGO (0.5 wt.%). The HRGO delivered a high electrical conductivity in DGEBA/PEI polyblends, wherein the value increased from 5.03 × 10−16 S/m to 5.88 S/m at a low content of HRGO (0.5 wt.%). Furthermore, the HRGO accelerated the curing reaction process of CRIPS due to its amino group. Finally, dynamic mechanical analyses (DMA) were performed to understand the CRIPS phenomenon and selective localization of HRGO reinforcement. The storage modulus increased monotonically from 1536 MPa to 1660 MPa for the 25 phr (parts per hundred in the DGEBA) PEI polyblend and reached 1915 MPa with 0.5 wt.% HRGO reinforcement. These simultaneous improvements in electrical conductivity and dynamic mechanical properties clearly demonstrate the potential of this conductive polyblend for various engineering applications.

Download Full-text

Bridged double percolation in conductive polymer composites: an electrical conductivity, morphology and mechanical property study

Polymer ◽

10.1016/s0032-3861(02)00180-5 ◽

2002 ◽

Vol 43 (13) ◽

pp. 3717-3725 ◽

Cited By ~ 148

Author(s):

Wiriya Thongruang ◽

Richard J. Spontak ◽

C.Maurice Balik

Keyword(s):

Mechanical Property ◽

Electrical Conductivity ◽

Polymer Composites ◽

Conductive Polymer ◽

Conductive Polymer Composites ◽

Double Percolation

Download Full-text

Structure and Electrical Conductivity of Polystyrene/Carbon Black Composites Prepared by Microlayer Coextrusion

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.717.38 ◽

2016 ◽

Vol 717 ◽

pp. 38-46 ◽

Cited By ~ 1

Author(s):

Chang Jin Li ◽

Liang Zhao Xiong ◽

Cong Ji Yuan ◽

Zhi Wei Jiao ◽

Wei Min Yang

Keyword(s):

Mechanical Properties ◽

Electrical Conductivity ◽

Electrical Resistivity ◽

Carbon Black ◽

Percolation Threshold ◽

Layered Structure ◽

Electrically Conducting ◽

Percolation Effect ◽

Multilayered Composites ◽

Double Percolation

Electrically conducting composites with a structure of alternating (A-B-A)n layers were prepared by a novel microlayer coextrusion, which were consisted of alternating layers of polystyrene (PS) and layers of carbon black (CB)-filled polystyrene (PSCB). The co-continuous structure with selective location of CB in PSCB layers was controllable by changing the number of multiplying elements, and decreased the percolation threshold and electrical resistivity of multilayered composites because of the double percolation effect. In addition, the multilayered composites exhibited better mechanical properties than that of the conventional blends, which were related to the layered structure and small size of CB aggregates.

Download Full-text

Enhanced electrical conductivity of poly(methyl methacrylate)-quasi-block-polystyrene/multiwalled carbon nanotubes composites with an optimized double percolation mechanism

RSC Advances ◽

10.1039/c4ra03528c ◽

2014 ◽

Vol 4 (79) ◽

pp. 42226-42233 ◽

Cited By ~ 11

Author(s):

Ri Xu ◽

Xuecheng Xu

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Methyl Methacrylate ◽

Multiwalled Carbon Nanotubes ◽

Multiwalled Carbon ◽

Poly Methyl Methacrylate ◽

Double Percolation

Download Full-text

107 Control of Microstructure and Electrical Conductivity of CNT-dispersed Si_3N_4 Ceramics by Double Percolation

The Proceedings of the Materials and processing conference ◽

10.1299/jsmemp.2010.18._107-1_ ◽

2010 ◽

Vol 2010.18 (0) ◽

pp. _107-1_-_107-3_

Author(s):

Junichi TATAMI ◽

Sara YOSHIO ◽

Tomohiro YAMAKAWA ◽

Toru WAKIHARA ◽

Katsutoshi KOMEYA ◽

...

Keyword(s):

Electrical Conductivity ◽

Double Percolation

Download Full-text

Removing Substrate Background in TEM Microanalysis

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052857 ◽

1974 ◽

Vol 32 ◽

pp. 568-569

Author(s):

John C. Russ ◽

Nicholas C. Barbi

Keyword(s):

Electrical Conductivity ◽

Rapid Growth ◽

Organic Film ◽

Absolute Concentration ◽

Background Signal ◽

X Ray ◽

Elemental Concentrations ◽

Transmission Electron ◽

Electron Microscopes ◽

The Continuum

The rapid growth of interest in attaching energy-dispersive x-ray analysis systems to transmission electron microscopes has centered largely on microanalysis of biological specimens. These are frequently either embedded in plastic or supported by an organic film, which is of great importance as regards stability under the beam since it provides thermal and electrical conductivity from the specimen to the grid.Unfortunately, the supporting medium also produces continuum x-radiation or Bremsstrahlung, which is added to the x-ray spectrum from the sample. It is not difficult to separate the characteristic peaks from the elements in the specimen from the total continuum background, but sometimes it is also necessary to separate the continuum due to the sample from that due to the support. For instance, it is possible to compute relative elemental concentrations in the sample, without standards, based on the relative net characteristic elemental intensities without regard to background; but to calculate absolute concentration, it is necessary to use the background signal itself as a measure of the total excited specimen mass.

Download Full-text