Polystyrene (also known as PS) is a thermoplastic polymerization product of styrene monomer. It is one of the most widely used materials. Along with high dielectric properties, water resistance, resistance to a number of reagents, polystyrene has a sufficiently low impact strength. In order to improve the impact strength, as well as to modify other properties of the material, styrene is copolymerized with rubber or other monomers.