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PS (polystyrene-based plastic) refers to the macromolecular chain comprising a styrene-based plastics, including styrene and its copolymers, particularly common species include polystyrene (GPPS), high impact polystyrene (HIPS ), expandable polystyrene (EPS) and metallocene polystyrene (SPS) and the like.
General Purpose Polystyrene is a thermoplastic resin, a shiny, transparent beads or granular solids. A density of 1.04 to 1.09, the transparency of 88% -92%, a refractive index of 1.59 to 1.60. Under stress, birefringence, the so-called stress - optical effect. Product melting temperature of 150 ~ 180 ℃, the thermal decomposition temperature of 300 ℃, heat distortion temperature of 70 ~ 100 ℃, long-term use temperature of 60 ~ 80 ℃. In a relatively low heat distortion temperature at 5 ~ 6 ℃, after annealing treatment can eliminate stress, the heat distortion temperature increased.
If you add a little α- methyl styrene in the production process, can improve the thermal rating of general purpose polystyrene.
It is soluble in aromatic hydrocarbons, chlorinated hydrocarbons, aliphatic ketones and esters, but only swelling in acetone. It can be resistant to the action of certain mineral oils, organic acids, alkali, salt, and an aqueous solution of a lower alcohol. Low water absorption in wet conditions can still maintain its mechanical properties and dimensional stability. The optical properties after the acrylic resin. Excellent electrical properties, volume resistivity and surface resistivity are high, and not affected by temperature and humidity changes, and is not affected by corona discharge. Radiation resistance is also very good.
Its main drawback is brittle and easy to crack, low impact strength, heat resistance is poor, not boiling water resistant, can only be used at lower temperatures and lower loads. Poor resistance to sunlight, flammable. Hair black smoke when burned, and there is a special smell.
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