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Polystyrene (Polystyrene, abbreviated PS) refers to a polymer synthesized from styrene monomer through radical addition polymerization reaction, 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, and disposable foam lunch boxes.
El poliestireno (PS) incluye poliestireno ordinario, poliestireno expandido (EPS), poliestireno de alto impacto (HIPS) y poliestireno sindiotáctico (SPS). La resina de poliestireno común no es tóxica, es inodoro, tiene partículas transparentes incoloras, es un material frágil similar al vidrio, sus productos tienen una transparencia extremadamente alta, la transmitancia de luz puede alcanzar más del 90%, buen rendimiento de aislamiento eléctrico, fácil de colorear y procesar. Buena fluidez, buena rigidez y buena resistencia química. Las desventajas del poliestireno común son la fragilidad, la baja resistencia al impacto, el agrietamiento por tensión, la mala resistencia al calor y la resistencia al agua hirviendo.
Impact resistant polystyrene (HIPS) is an impact-resistant polystyrene product produced by adding polybutyl rubber particles to polystyrene. This polystyrene product will add micron-sized rubber particles and connect the polystyrene and rubber particles together by grafting. When subjected to an impact, the tip stress of the crack propagation will be released by the relatively soft rubber particles. Therefore, the propagation of cracks is hindered and the impact resistance is improved.