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Biostability of electrically conductive polyester fabrics: an in vitro study
Xiaoping Jiang1, Dominic Tessier, Lê H Dao
1Institut des biomatériaux du Québec, Hôpital Saint-François d'Assise, Département de chirurgie, Université Laval, Québec City, Québec, Canada.
Journal of Biomedical Materials Research
|September 11, 2002
Summary
Polypyrrole (PPy)-coated polyester fabrics show increased electrical resistivity over time in saline, impacting their biostability. Further improvements are needed for long-term conductivity applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Textile Science
Background:
- Polypyrrole (PPy) coatings are explored for functional textiles.
- Biostability of conductive coatings is crucial for biomedical applications.
Purpose of the Study:
- To investigate the in vitro biostability of polypyrrole-coated polyester fabrics.
- To assess the impact of incubation on electrical properties and surface characteristics.
Main Methods:
- Incubation of PPy-coated fabrics in saline at 37°C for 1-2 weeks.
- Measurement of surface electrical resistivity before and after redoping.
- Surface morphology analysis using scanning electron microscopy.
- Surface chemical composition and nitrogen oxidation analysis via X-ray photoelectron spectroscopy.
Main Results:
- Surface electrical resistivity increased non-linearly over time due to dedoping and oxygen uptake.
- Resistivity ranged from 10^3-10^4 Ω/square after 1 week, suitable for short-term electrical stimulation.
- Occasional cracking and delamination of PPy coating observed with significant resistivity increase.
Conclusions:
- PPy-coated polyester fabrics exhibit limited biostability in vitro.
- Conductivity stability needs enhancement for reliable long-term performance in biomedical settings.