Conductive thermoplastics, resistivity

Figure 18.8 Setups for measuring surface and bulk resistivity. (After Ref [74].) Table 18.7 Resistivity classification of conductive thermoplastics.

Hyperion Catalysis International markets its nanombes under the name Fibril . Adding 5% to polycarbonate transforms its volume resistivity from lO to 10 ohm-cm and, unlike some particulate additives, only reduces the tensile strength by 11%, while increasing the flexural modulus by 18%. One important application is the polyamide fuel lines in vehicles, and another is the production of the conductive thermoplastic fenders used for in-line electrostatic painting. In the case of fuel lines, the compounding system must produce highly homogeneous compositions to rule out local static build up. Less than one per cent of nanotubes is sufficient. 

Conductive Thermoplastic Compounds. Conductive thermoplastic compounds were prepared using Eeonomers. Volume resistivity as a fimction of Eeonomer content is shown in Figure 4 for nylon-6 and ABS compounds. The volume resistivity is observed to fall several orders of magnitude between 5 and 10 wt % of composite concentration. This indicates that the resistivity is very responsive to Eeonomer loading level and that percolation is occurring within this range. 

ISO 1853, Conducting and dissipative rubbers, vulcanized or thermoplastic -Measurement of resistivity, 1998. 

ISO 1827 1991 Rubber, vulcanized or thermoplastic - Determination of modulus in shear or adhesion to rigid plates - Quadruple shear method ISO 1853 1998 Conducting and dissipative rubbers, vulcanized or thermoplastic -Measurement of resistivity... 

The polymer is used in microwave absorbers and as conductive coating with good abrasion resistance for electronic components. Polyaniline is not thermoplastic and cannot be melted or even softened by heat. It is still stable up to about 240° C and starts decomposing at higher temperatures. 

Properties Transparent, electrically conductive, resilient, and thermoplastic. Cannot be completely dissolved in any commercial solvents. High resistance to abrasion, cracking, corona attack high tensile strength. Working temperature approximately -108 to +65.5C. 

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