PS
Polystyrene (abbreviated PS) refers to a polymer synthesized by free radical addition polymerization
of styrene monomer, and the chemical formula is (C8H8)n. It is a colorless and transparent
thermoplastic with a glass transition temperature higher than 100°C, so it is often used to make
various disposable containers that need to withstand the temperature of boiling water, as well as
disposable foam lunch boxes. The glass transition temperature of polystyrene is 80～105℃, the
amorphous density is 1.04～1.06g/cm3, the crystal density is 1.11～1.12g/cm3, the melting
temperature is 240℃, and the resistivity is 1020～1022Ω·cm. Thermal conductivity 0.116 watts/(m·K)
at 30°C. Usually polystyrene is an amorphous random polymer, which has excellent heat insulation,
insulation and transparency. The long-term use temperature is 0-70 ° C, but it is brittle and easy to
crack at low temperature. There are also isotactic and syndiotactic and atactic polystyrene. Isotactic
polymers are highly crystalline, and syndiotactic polymers are partially crystalline.
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