Plastics and plasticizers related knowledge

Winter, outdoors, plastic raincoat like cardboard, plastic soles as hard Bang Bang ring. Why is cold hard plastic, when the heat tweed? Plastics are polymers. It consists of thousands of small molecules to one another, "hand in hand" to join together to form molecules "chain." Drops on the metal chain in oil, the chain between the freedom of movement. Between macromolecular chains in the plastic, you can not add oil, but adding "plasticizer" In the future, it becomes soft and hard plastic together. Plastic raincoats, sheets plasticizer plus much more, you can freely folded, crumpled: plastic sandals in the plasticizer less, though soft, but not folded: Some hard plastic tube plasticizer even less, only baked on the fire to soften, bend. plastic flame retardant
Plastic soft with hard, to see the added plasticizers are mostly less. However, the conventional oil as plasticizer and fried Levin, together with the temperature drop becomes thick, lubricating ability getting smaller and smaller. Plastic macromolecular chains in the "oil" are freezing, and naturally become stiff plastic friends. Therefore, the use of plastic cold regions and tropical use plastic products, in the variety and proportion of plasticizer, is not the same. Plastic products with a long time, through wind, sun, rain, and the volatile plasticizer, will harden brittle hair, which is called the plastic of the "aging." Metal soap
So, plastic raincoat when not, to wipe clean, folded and put a plastic bag to save. Generally polyvinyl chloride, polystyrene and other plastic products toxic and can not be used to serve food. Milk bottle, cup, water bottle and food bags are made of polyethylene. The chemical composition of polyethylene and candle oil almost no toxicity, no added plasticizers, we can safely use. Polyethylene plastic is not difficult to identify. It looks like a wax, close to the flame fusion, soft, divergence of the candle burning oil odor, other plastics, such as polyvinyl chloride, polystyrene, glass, although the same and polyethylene, heat will melt, soften , but the burning smell different Shique.
Plastic shoes, plastic basin, plastic raincoat, PVC artificial leather, etc. is done, toothbrush, soap dish is made of polystyrene, triangle, semicircle instrument, card, button plexiglass do, plus do utensils with polyethylene, these types of plastic are heated to soften, cold hardening, called "thermoplastic" plastics.