Effect of processing technology on the morphological, mechanical and electrical properties of conductive polymer composites

Abstract

Conducting carbon/polypropylene (PP) and carbon/poly(butylene terephthalate) (PBT) composites containing crystalline natural graphite and carbon black (CB) were prepared by compression and injection molding. The effect of the processing technology on the electrical, mechanical, and morphological properties was investigated. Determination of the constant torque at the end of the mixing process and differential scanning calorimetric (DSC) measurements showed that graphite had better connectivity with the more polar matrix (PBT) than with the less polar one (PP). Scanning electron microscopy (SEM) studies showed that compression molding results in a homogeneous structure, while injection molding results in a skin-core structure with different orientations. Layered electrical conductivity studies showed that the electrical conductivity of the compression molded samples did not change along the thickness of the sample, while that of the injection molded samples changed throughout the material, which is due to the different structures developed with each type of processing.

Optimizing formulations of polymer composite with high filler content: Application to bipolar plate

“…This should results from a parameter that has not been accounted for in the model and namely the process. Our experiments might have not been entirely optimized in the way they have been prepared in contrast with the other published data [30,31]. In other words the I Perf index developed in the present study may only reveal the properties of the best formulations combined with an optimized processing.…”

Application of activated barrier hopping theory to viscoplastic modeling of glassy polymers

“…After drying the granules in a vacuum oven overnight, sheets nominally 0.9 mm thick were compression molded between platens heated to 553 K (280 °C) at a pressure of up to 4 MPa. This method of manufacture is established as one that produces no significant skin-core effects (Kiraly and Ronkay 2013 ; Jarus et al 1996 ). Sheets were then quenched into water at ambient temperature.…”

Effects of flake graphite on property optimisation in thermal conductive composites based on polyamide 66

“…Others try to investigate the effect of processing method on the properties of composite. Ronkay and Kiraly [31] prepared conductive polymer composites filled with natural graphite and carbon black to investigate effect of processing technology on the morphological, mechanical and electrical properties. However, the effect of single FG filler on the thermal conductivity property of FG/PA66 composites is less researched.…”