Electromagnetic interference shielding effectiveness and mechanical sliding behavior for electroless nickel/phosphorous–poly(tetrafluoroethylene) codeposition on carbon fiber/acrylonitrile–butadiene–styrene composites

Abstract

Poly(tetrafluoroethylene) (PTFE) powders were mounted on an electroless nickel/phosphorous (Ni/P) film on the surface of a carbon fiber by an electroless codeposition method. This type of carbon fiber filler, denoted FENCF, was then compounded with acrylonitrile-butadiene-styrene (ABS) for use in electromagnetic interference shielding. For the suspension of the PTFE powders, a surfactant was used. Although the adhesion between the electroless Ni/P-PTFE films and the fiber was reduced, the PTFE powders on the surface of FENCF reduced the torque values when compounded into the ABS matrix because of a self-lubricating effect. The two-step FENCF composites exhibited particularly significant advantages. The torque values for the two-step FENCF/ABS composites were about one-half of those for carbon fiber/ABS composites in compounding processes; in addition, the former had an average mean fiber length almost 2.5 times that of the latter. The multiyield phenomena in stress-strain curves of FENCF/ABS composites implied that the PTFE powders mounted on Ni/P films slid during stress-strain action. The electromagnetic interference shielding effectiveness of FENCF/ABS composites did not decrease significantly even though the PTFE powders formed a discontinuous phase on the electroless Ni/P films. The mechanical properties of FENCF composites were enhanced because of the larger fiber length.

Detection of human parechovirus in stool samples collected from children with acute gastroenteritis in Japan during 2007–2008

“…Although carbon fibers also possess very high aspect ratios, their electrical conductivity is not as good as pure metal. For this reason, some researchers coated carbon fibers with a layer of nickel by ordinary or electroless plating in order to enhance their conductivity 3–5. However, the weak adhesion between carbon fiber and nickel may cause problems during processing 6.…”

Effect of swelling pretreatment on the deposition structure on electroless copper of polyacrylonitrile nanocomposites for electromagnetic interference shielding

“…In the past, metals were applied to electromagnetic interference (EMI) shielding since they could reflect or conduct the free electrons. [1][2][3] However, the development of electronic equipment tends to small and lightness of weight in last years. Many technologies have been developed to provide EMI shielding.…”

“…Electronic equipment has needed shielding to reduce interference that might abnormally affect their operation and to ensure reliable operation in an electromagnetically polluted environment. In the past, metals were applied to electromagnetic interference (EMI) shielding since they could reflect or conduct the free electrons 1–3. However, the development of electronic equipment tends to small and lightness of weight in last years.…”

Effect of mixing process on electromagnetic interference shielding effectiveness of nickel/acrylonitrile–butadiene–styrene composites

“…For this reason, some researchers coated carbon fibers with a layer of nickel by ordinary or electroless plating in order to enhance their conductivity. [3][4][5] However, the weak adhesion between carbon fiber and nickel may cause problems during processing. 6 In addition, the enhancement in the EMI shielding effect may not be obvious if the coating layer of nickel is not thick enough.…”