Polycarbonate (PC) is the polyester of carbonic acid. Carbonic acid itself is not stable, but its derivatives (such as phosgene, urea, carbonates, and carbonates) all have certain stability.
According to the difference in alcohol structure, polycarbonate can be classified into two types: aliphatic and aromatic.
Aliphatic polycarbonate. Such as polyethylene carbonate, polytrimethylene carbonate and their copolymers, have low melting points and glass transition temperatures, and poor strength, and thus cannot be used as structural materials. However, by taking advantage of its biocompatibility and biodegradability, it can be applied in areas such as drug slow-release carriers, surgical sutures, and bone support materials.
Polycarbonate is resistant to weak acids, weak alkalis and neutral oils.
Polycarbonate is not resistant to ultraviolet light and strong alkali.
PC is a linear polycarbonate polyester. In its molecule, carbonate groups are alternately arranged with other groups, which can be aromatic, aliphatic, or both. Bisphenol A type PC is the most important industrial product.
PC is an almost colorless, glassy amorphous polymer with excellent optical properties. PC high molecular weight resin has very high toughness. The notched impact strength of the cantilever beam is 600 to 900J/m. The heat deflection temperature of the unfilled grade is approximately 130° C. After glass fiber reinforcement, this value can be increased by 10°C. The flexural modulus of PC can reach over 2400MPa, and the resin can be processed into large rigid products. Below 100°C, the creep rate under load is very low. PC has poor hydrolysis resistance and cannot be used in products that are repeatedly exposed to high-pressure steam.
The main performance defects of PC are insufficient hydrolytic stability, sensitivity to notches, poor resistance to organic chemicals and scratches, and yellowing when exposed to ultraviolet rays for a long time. Like other resins, PC is prone to erosion by certain organic solvents.
PC material is flame retardant. Antioxidant property.
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