polystyrene exists in an amorphous state because of the presence of bulky phenyl groups, packing of polystyrene chains is not efficient.
polystyrene is non-polar in nature.
polystyrene melting point is 240 degrees Celsius.
polystyrene density is 1.05 g/cm3
polystyrene boiling point is 430 degrees Celsius.
polystyrene thermal conductivity is 0.003 W/m.K.
polystyrene specific gravity is 1.054.
polystyrene has a good optical property like it is transparent polymer allowing high transmission of all wavelengths. Moreover, its high refractive index gives it a particularly high brilliance.
Due to the chain stiffening effect of the benzene ring, polystyrene is hard but brittle. It emits a characteristics metallic sound when dropped.
Being a non-polar amorphous polymer, its softening temperature is low. It cannot withstand the temperature of boiling water.
polystyrene has a low tendency for moisture absorption. Moreover, it has good electrical insulation characteristics. Therefore, used in making polystyrene insulation products.
polystyrene has reasonable chemical resistance but mediocre oil resistance.