Peek (polyether ether ketone)
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PEEK is a colorless, semi-crystalline thermoplastic with excellent mechanical properties that is formed through step-growth polymerization. It has a density of 1.32 g/cm3, glass transition temperature of 143°C, and melting temperature of 343°C. PEEK has high strength, creep resistance, and chemical resistance, making it suitable for applications in industries like aerospace, automotive, and medical implants where it can replace metals like steel. PEEK is synthesized through a step-growth reaction between 4,4-difluorobenzophenone and disodium salt of hydroquinone at 300°C in diphenyl sulfone.
Peek (polyether ether ketone)
- 1. INTRODUCTION • A type of Specialty Polymer; belongs to polyaryl ether ketone family • Is a colorless thermoplastic • Semi-crystalline • Has ether (-O-) as well as ketone (-CO-) linkages • Formed by step-growth polymerization • Has excellent mechanical properties
- 2. Properties Density 1.32 g cm-3 Young’s Modulus 3.6 GPa Tensile Strength 90-100 MPa Elongation @ Break 50% Tg 1430C Tm 3430C Excellent creep resistance, fatigue, stress crack, chemical & hydrolysis resistance Very low moisture absorption (~ 0.1% in 24 hours) Attacked by halogens, halogenated compounds & aliphatics @ high temp Soluble in H2SO4 @ room temp Can withstand high temp (~2500C) Resistant to thermal as well as biodegradation
- 3. Steel Brass Aluminum PEEK has 83% lower density PEEK has 85% low Density PEEK has 50% low density PEEK has better chemical resistance PEEK has better chemical resistance PEEK has better chemical resistance PEEK is softer PEEK is harder PEEK is harder PEEK has better dry wear PEEK has better wear & friction resistance PEEK has better wear & friction resistance PEEK vs. Steel vs. Brass vs. Aluminum
- 4. Synthesis Obtained by step-growth polymerization Rxn involves dialkylation of bisphenolate salts Typical rxn involves 4,4-diflouorobenzophenone & disodium salt of hydroquinone Rxn is carried out at temp of 3000C in presence of aprotic solvent like diphenyl sulphone
- 5. 4,4-diflouorobenzophenone disodium salt of hydroquinone Poly(ether ether ketone) 300oC Diphenyl Sulphone
- 6. Mechanism Step 1 Step 2 OH + NaOH + H2O OH ONa ONa Hydroquinone Sod. Salt of Hydroquinone C O F F + NaO ONa Diflourobenzophenone F C O O ONa Continues further
- 7. APPLICATIONS Used in medical implants Fabrication of bearings, pistons, pumps, HPLC, compressor plate valves & cable insulation Used for ultra high vacuum applications Coatings for metals Applications in aerospace, automotive & chemical processing industries Used in spinal fusion devices Used as reinforcing rods
- 8. PEEK as Metal/Steel replacement PEEK is much lighter in wt Has comparable strength Resistant to chemicals at room temp Resistance to corrosion Is weld able, machinable Can be bonded with epoxies
- 9. PEEK in Aerospace Industry Light in wt; Saves a lot of money (~ USD 5 Million) It matches aluminum’s mechanical property Resistant to hydraulic fluids PEEK tubing is superior to those of aluminum as well as steel PEEK tubing & fittings have excellent abrasion resistance
- 12. References https://en.wikipedia.org/wiki/PEEK Google images https://www.bpf.co.uk/plastipedia/polymers/p eek.aspx http://www.offshore- europe.co.uk/__novadocuments/88940?v=63 5702546462770000