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S. Frąckowiak, M. Kozłowski

Electrically conductive polymeric composites as potential sensor materials

Polimery 2010, No 5, 390


DOI: dx.doi.org/10.14314/polimery.2010.390

Summary

Studies on the modification of polymeric matrix by an electrically conductive filler to obtain electrically conductive composites for use as sensors are presented. Polymers possess a limited ability to conduct electricity and for this reason are often used as insulators (Fig.1). However, filling a polymer with an appropriate amount of conducting filler enables the production of an electrically conductive composite material. The occurrence of the "selective deformation" effect enables the production of a specific structure of the composite. This effect generates a series of changes in the properties in the material under the influence of chemical compounds. Moreover, the electrical conductivity is also changed which in consequence allows the composite to detect chemical substances which come in contact with it. Depending on the type of material used as composite matrix, it is possible to detect specific chemical compounds. The sensory potentials of the obtained composites were determined on the basis of the measured electric current changes taking place in a sample after being repeatedly exposed to a solvent (Fig. 3-9). The repeated analysis cycle consisted, among others of the immersion in the solvent and drying in air of the sample. The influence of multiple swelling of the sensor on the character of the obtained electrical signal was presented. The mechanical properties (Fig. 13-18) and melt rheology (Fig. 10-12) of the composites was also determined.


Key words: polymeric composites, electrically conducting, carbon black, swelling, sensor


e-mail: mailto:stanislaw.frackowiak@pwr.wroc.pl


S. Frąckowiak, M. Kozłowski

Electrically conductive polymeric composites as potential sensor materials