Metallurgy and Materials Engineering Department, University of Punjab Lahore.

2. Polypyrrole
Daniyal Asmi
14MMES1-348
5th
Department of Metallurgy & Material Engg.
UNIVERSITY OF THE PUNJAB

3. Introduction • Conductive polymeric
material: an invention of
polypyrrole (1900)
• Hideki Shirakawa Alan
Heeger, Alan Macdiarmid
introduced the concept of
conductive polymeric
materials
• Donald Weiss and coworkers
of Australia

4. Monomer
• A Heterocyclic Aromatic
organic compound
• Five member ring
• Darkens upon exposure to air

5. Production
• Oxidation of Pyrrole
• Electrochemical synthesis

6. Physical properties
• A conductive material due to delocalized orbitals
• Good thermal stability if treated with acid or base (sulphuric acid and sodium hydroxide)
• Glass transition temperature 160 – 170 degrees
• Melting point -23 degrees
• Chemically stable due to cross linking and show corrosion resistance

7. Commercial availability
• Black powder by monomer
oxidation
Limitations
• Low mechanical strength
• Low proccessability
• fragile
Products
• Coating on fabrics, glasses, sheets, etc.
• These coatings gives both electrical and
mechanical properties to the material on
which they are used
• Radar absorbers
• Artificial muscles for robots

8. Applications
• Electrical devices, semiconductors etc.
• Copper nanowires
• Super capacitors
• Catalyst for fuel cells
• Bio sensors

9. Recent research
Sensing and bio-sensing
• Polypyrrole coated copper Nano
wires
• Gas sensor application (carbon
dioxide and oxygen)
www.sciencedirect.com (authors: H. shokry Hasan, A. B. Kahsyout, I. Morsi, A.A.A.
Naseer, H. Abukallil Sensing and bio-sensing. 2015 issue year )
Progress in Natural science:
Materials International
• Polypyrrole nanowires
• High performance super capacitors
application
www.sciencedirect.com (authors: jhung hong zao, jinping wu, wing le, wiemen du, qing li
huang, ming bo zheng, huang pang, Progress in natural science: Materials internantional,
2016 issure year,)

10. Conclusion
• Development in early 1900’s
• Good electrical conductance properties
• Extensive applications due electrical conductance