12/25/2023 0 Comments Styrofoam ceiling tiles![]() Several days later, Simon found that it had thickened into a jelly, now known to have been a polymer, that he dubbed styrol oxide ("Styroloxyd") because he presumed that it had resulted from oxidation ( styrene oxide is a distinct compound). From storax, the resin of the Oriental sweetgum tree Liquidambar orientalis, he distilled an oily substance, that he named styrol, now called styrene. Polystyrene was discovered in 1839 by Eduard Simon, an apothecary from Berlin. It is accumulating as a form of litter in the outside environment, particularly along shores and waterways, especially in its foam form, and in the Pacific Ocean. ![]() Under ASTM standards, polystyrene is regarded as not biodegradable. The temperatures behavior can be controlled by photocrosslinking. This temperature behaviour is exploited for extrusion (as in Styrofoam) and also for molding and vacuum forming, since it can be cast into molds with fine detail. Īs a thermoplastic polymer, polystyrene is in a solid (glassy) state at room temperature but flows if heated above about 100 ☌, its glass transition temperature. Uses include protective packaging (such as packing peanuts and in the jewel cases used for storage of optical discs such as CDs and occasionally DVDs), containers, lids, bottles, trays, tumblers, disposable cutlery, in the making of models, and as an alternative material for phonograph records. Polystyrene is naturally transparent, but can be colored with colorants. Polystyrene is one of the most widely used plastics, with the scale of its production being several million tonnes per year. ![]() It is a poor barrier to air and water vapor and has a relatively low melting point. ![]() It is an inexpensive resin per unit weight. General-purpose polystyrene is clear, hard, and brittle. Polystyrene ( PS) / ˌ p ɒ l i ˈ s t aɪ r iː n/ is a synthetic polymer made from monomers of the aromatic hydrocarbon styrene.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |