Group 7 edited 2


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Group 7 edited 2

  2. 2.  Was developed in 1953 by Bayer in Germany, and General Electric in US independently. one of the high performance heterochain polymeric material that comprises the family of engineering thermoplastic
  3. 3. •PC molecule composed by a bisphenol A part and carbonategroup•Bisphenol A contain two aromatic ring which are responsible forPC stiff backbone•Bisphenol also contribute to PC inability to crystallize•It contribute to be amorphous and give the polymer transparency•High glass transition temperature (Tg=145°C)
  4. 4. 1) Bisphenol Agroup reacttedwith protonacceptor suchas NaOH toobtained thepolyemrizationfunctionalgroup
  5. 5. 2) ThedeprotonataedBisphenol Areacts withPhosgene and acatalyst attemperaturebeteween 25-35degree
  6. 6. PROPERTIES DESCRIPTIONTemperature •Glass transition : 145ᵒC •Melting point : 225ᵒCAmorphous 1.20 g/cm3densityMolecular weight 254.3 g/molResistance •Excellent : dilute acids and mineral oils •Good : Alcohols and vegetable oils •Limited : Aldehydes •Poor : Concentrated Acids, Bases, Esters, Aliphatic Hydrocarbons, Aromatic Hydrocarbons, Halogenated Hydrocarbons, Ketones and Oxidizing Agents.
  7. 7. ADVANTAGES DISADVANTAGESStrength Production•High & lightweight •High processing temperature•Tough & stable•Resist temperature to 120ᵒCUV protection Resistant•‘bloom’ when exposed to sunlight •Poor resistant to alkaliesEasy to modify Needs UV stabilization•Safe to machine
  8. 8.  Combination of diisocyanate Thermoplastic Common comercial polymer, and can process amazingly diverse properties depending on how they are manufactured The present of both amide and carbamide give the characteristic of plastic in this polymer
  9. 9.  General component
  10. 10.  synthesis
  11. 11. PROPERTIES DESCRIPTIONMechanical •Resistance to further tearing •Resistance to abrasionElectrical Surface resistanceFabrication •High : strength (impact, tensile, shear, and flexural), modulus of elasticity •Excellent : strength retention at elevated temperatures, flow resistance (creep and cold) •Low : deformation under load, coefficient of thermal expansion •good electrical insulation properties •easy to fabricateOthers •Microbial resistance of PUR •Resistance to media •Resistance to atmospheric corrosion •Fire resistance
  12. 12. ADVANTAGES DISADVANTAGESAbrasion resistant Durability•outwear other materials •hydroscopic tendenciesLoad bearing capacity Odour•High, ideal material for load •petroleum-based chemical,flamewheels, heavy duty couplings retardant fumes cause physical problems; this becomes irritating.Weather resistant Health Problems•resistance to oxygen, ozone, •releases toxic fumes (symptom :sunlight and general weather allergic reactions, rashes, difficultyconditions breathing, loss of consciousness, blindness)Excellent noise abatement Environmental Issuesproperties •blowing agents produce•used to replace rubbers for greenhouse gasesimproved sound/vibrationdampening
  13. 13. POLYCARBONATE POLYURETHRANE•Electronic components •Belts•Construction materials •Prototype machined parts•Data storage •Wood finishing•Automotive, aircraft, and •Furnituresecurity components •Automobile seats•Niche applications •Houses, sculptures, and•Medical applications decorations