Tensile and impact properties of carbon filled nylon‐6,6 based resins

Abstract

Electrically and thermally conductive resins can be produced by adding conductive fillers to insulating polymers. Mechanical properties such as tensile modulus, ultimate tensile stress, strain at ultimate tensile stress, and notched Izod impact strength are also important and cannot be ignored. This study focused on performing compounding runs, followed by injection molding and evaluation of tensile and impact properties of carbon filled nylon-6,6 based resins. The three carbon fillers investigated include an electrically conductive carbon black, synthetic graphite particles, and a surface treated polyacrylonitrile (PAN) based carbon fiber. Resins containing varying amounts of these single carbon fillers were produced and tested. In addition, combinations of fillers were investigated by conducting a full 2 3 factorial design and a complete replicate. The addition of carbon fiber increased the composite tensile modulus, ultimate tensile stress, and impact strength. Also, in many cases, combining two or three different fillers caused a statistically significant effect at a 95% confidence level. When comparing the results of this study with prior work, it appears that increased heteroatoms present on the carbon fiber surface likely improve composite ultimate tensile stress and impact strength.

Synergistic Effects of Carbon Fillers in Thermally Conductive Liquid Crystal Polymer Based Resins

“…The corresponding fiber aspect ratio (length/diameter) was 9. These results agree with prior work [19,36,37].…”

“…These values are similar to that of the as-received material and prior work [36,37]. For the molded composites containing Fortafil 243, the length was typically 70 mm.…”

Effects of carbon fillers on the thermal conductivity of highly filled liquid‐crystal polymer based resins

“…These observations agreed with prior work, and additional photomicrographs have been shown elsewhere. 19,20,[37][38][39][40] Through-plane thermal conductivity results…”

“…These values were similar to those of the as-received material and prior work. 37,38 For the injectionmolded composites containing Fortafil 243, the length was typically 70 lm, and the corresponding fiber aspect ratio (length/diameter) was 9. These results agreed with prior work.…”

“…These results agreed with prior work. 19,20,37,38 The fillers for the in-plane thermal conductivity samples were primarily oriented in the in-plane thermal conductivity measurement direction, which was induced by the injection-molding process. The fillers in the through-plane samples were primarily oriented transverse to the thermal conductivity measurement direction.…”