Copolymers :

Been brittle is a characteristic of pure polystyrene, but hard enough that a fairly high-performance product can be made by giving it some of the properties of a stretchier material, such as polybutadiene rubber. The two such materials can never be mixed because of the amplified result on intermolecular forces on polymer insolubility (plastic recycling), but if polybutadiene add through polymerization it can become chemically bonded to the polystyrene, forming a graft copolymer, which assist to incorporate usual polybutadiene into the final mix, resulting in high-impact polystyrene or HIPS, regularly called "high-impact plastic" in ads. One commercial name for HIPS is Bextrene. main applications of HIPS are toys and product casings. HIPS is typically injection molded in production. Autoclaving polystyrene is able to compress and harden the material.

There are Several copolymers which can also used with styrene. Acrylonitrile butadiene styrene or ABS plastic is similar to HIPS: a copolymer of acrylonitrile and styrene, toughened with polybutadiene. Most electronics cases are made of this form of polystyrene, same as many sewer pipes. SAN is a copolymer of styrene with acrylonitrile, and SMA one with maleic anhydride. Styrene can be copolymerized with other monomers; for example, divinylbenzene should be used for cross-linking the polystyrene chains to provide the polymer used in Solid phase peptide synthesis.

Oriented Polystyrene :

Oriented polystyrene (OPS) is made by extending extruded PS film, which can improve visibility through the material by decreasing haziness and increasing stiffness. This is frequently used in packaging where the manufacturer would like the consumer to see the enclosed product. Some benefits to OPS are that it is a little expensive to produce than other clear plastics such as PP, PET, and HIPS, and it is less hazy than HIPS or PP. The main disadvantage to OPS is that it's fragile. It will crack or tear simply.