Polycarbonate (PC)

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Polycarbonate (PC)
Polycarbonate material is formed by a condensation polymerization resulting in a carbon that is bonded to three oxygens. The most common system for this polymerization is formed by a reaction of bisphenol A and phosgene. Applications of polycarbonate are almost always those which take advantage of its uniquely high impact strength and its exceptional clarity. These unique properties have resulted in applications such as bulletproof windows, break resistant lenses, compact discs, etc. More recently however, additional interest has resulted because of the low flammability of polycarbonate.

Advantages of Polycarbonate

Excellent impact resistance and strength at low and high temperatures. Available in visually clear grades. Good heat strength.

Flame Retardant
RoHS Compliant
Mold Release, Good
Lubricated
Dimensional Stability, Good
Impact Resistance, Good
Processability, Good
Heat Resistance, High
Viscosity, Medium

Disadvantages of Polycarbonate

Subject to stress cracking
Fairly high processing temperatures required
Degrades upon extended residence time in processing equipment
Chemical resistance is only fair
Aromatic sensitivity

Background of Polycarbonate

Polycarbonates (PC) were first prepared by Einhorn in 1898 and extensively researched until 1930 where they were discarded. Research was then started in the mid 1950s by General Electric and in 1958 the Polycarbonate popularity expanded to a global community. Today, approximately 75% of the Polycarbonate market is held by SABIC Innovative Plastics (formerly known as General Electric) and Bayer Material Science.

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