Topic: Polycarbonate Name: M.Qasim

Roll No:E13-342

Semester: 5th

Dept: Metallurgy & Material EnigineeriingUniversity Of the Punjab

polycarbonate: PC trademarked names Lexan, Makrolon, Makroclear and others, are a particular group of thermoplastic polymers. Easily worked, molded, thermoformed and recycleable material.

PC was first developed by German scientist '' Hermann Schnell" in 1953.

• PC is one of the high performance heterochain polymeric materials that comprise the family of “engineeringthermoplastics”

• PC is a good material due to its good impact strength low scretch resistance.

chemical structure bisphenol A (BPA)

• condensation polymerization is occure in PC

• Bisphenol A is produced by the condensation of phenol with propanone.

• Carbonyl chloride is produced from carbon monoxide and chlorine

Properties: (phy,mech)

• density of pc is 1.20–1.22 g/cm3 • Excellent resistance (no attack) to

dilute acids and mineral oils.• Poor resistance with

Concentrated Acids, Bases, Esters, Aliphatic Hydrocarbons, Aromatic Hydrocarbons, Hydrocarbons, and Oxidizing Agents.

• Melting temperature (Tm) 155 °C (311 °F)

• Glass transition temperature (Tg)147 °C (297 °F)

• heat deflection tempetarure is (Hdt) 128–138 °C

• PC is commercially available into pellets form.

Processes:

Moulding Extrusion The molten pc is pass through The pc melt is pressed intothe die that gives the material its a mould with the definite shape final shape after that materail of tha final product. The melt iscooled rapidely. long pipe and then cooled into the mold. The sheet are created b this method. process is specific for parts of automobile and computer parts.

Application:

• PC is used into electronic component like dielectric and capacitor it is also good insulator

• Used for glazing• Used into data storage devices like Compact Discs, DVDs, and

Blu-ray Discs.• Automotive, aircraft and security component like F-22 Raptor jet

and bullet-proof "glass",

• Limitation: • Subject to stress cracking.• Degrades upon extended residence time in processing equipment.• Chemical resistance is only fair.• Aromatic sensitivity.

Article: 1 Changes in the properties of Lexan polycarbonate by UV irradiation

• The changes in the microstructural parameters of Lexan polycarbonate films irradiated with UV radiationat a wavelength of Ƭ=250 nm were investigated using wide-angle X-ray scattering measurements. The

• crystal imperfection parameters, such as the crystallite size, lattice strain, and enthalpy, were determined by line profile analysis using the Fourier method of Warren.

• Thermogravimetric analysis revealed that the thermal decomposition temperature increased after the films were irradiated.

• total uv out is 0.5 w at centre of the photoreactor where the film

• was placed to be irradiated.

Reference: Nuclear Instruments and Methods in Physics Research B 295 (2013) 61–68 www.sciencedirect.com.

Article: 2 Compact Disc Laser Cleaning for Polycarbonate Recovering

• Laser cleaning of Compact Discs (CDs) through the employment of a 30 W MOPFA Q-switched pulsed Yb:YAG fibre laser investigated.

• several advantages, including: absence of mechanical contact, reduction of secondary pollutants, low energy consumption, greater flexibility of use and possibility to work small batches.

• The minimum time required to clean a CD-R with a beam power higher than 250W is 5 seconds.

conclusion: After the brifely explanation of pc am

reached to conclusion that is if we

comapre pc with other polymer it

promin with its high impact strength.