Polypyrrole

Metallurgy and Materials Engineering Department, University of Punjab Lahore.

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

2. 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

3. Monomer A Heterocyclic A romatic organic compound Five member ring Darkens upon exposure to air

4. Production Oxidation of Pyrrole Electrochemical synthesis

5. 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

6. 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

7. A pplications Electrical devices, semiconductors etc. Copper nanowires Super capacitors Catalyst for fuel cells Bio s ensors

8. Recent research Sensing and bio-sensing P olypyrrole 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 , )

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