Chemical properties of products
Polycarbonate (PC) is the polyester class of carbonic acid, carbonic acid itself is not stable, but its derivatives (such as phosgene, urea, carbonate, carbonate) have a certain stability.
According to the different alcohol structure, polycarbonate can be divided into two categories of aliphatic and aromatic.
Aliphatic polycarbonate. Such as polyethylene-carbonate, polytrimethylene carbonate and its copolymers, low melting point and glass transition temperature, poor strength, can not be used as structural materials; but the use of its biocompatibility and biodegradable properties, can be used in drug slow release carriers, surgical sutures, bone support materials and other applications.
Polycarbonate is resistant to weak acids, weak bases, and neutral oils.
Polycarbonate is not resistant to ultraviolet light and strong alkalis.
PC is a linear carbonate polyester with alternating carbonic acid groups in the molecule with some other groups that 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 good optical properties. PC high molecular weight resin has high toughness, cantilever beam notched impact strength of 600~900J/m, unfilled grade heat deflection temperature of about 130°C, glass fiber reinforced can make this value increased by 10°C. PC bending modulus can reach more than 2400MPa, the resin can be processed into large rigid products. The creep rate under load is very low below 100°C. PC is poorly resistant to hydrolysis and cannot be used for products that are repeatedly subjected to high pressure steam.
The main performance deficiencies of PC are its lack of hydrolytic stability, sensitivity to chipping, resistance to organic chemicals, poor scratch resistance, and yellowing from long-term exposure to UV light. Like other resins, PC is susceptible to erosion by certain organic solvents.
PC materials are flame retardant. Resistant to oxidation.