The common types of plastics are:
①Polyvinyl chloride (PVC) ②Polyethylene (PE) ③Polypropylene (PP) ④Polystyrene (PS) ⑤ABS plastic?
Classification, composition and properties of plastics
Plastic is a widely used synthetic polymer materials, plastic products abound in our daily lives. From the toiletries we use when we get up, the tableware we use at breakfast, to the stationery we use when we work and study, the seat cushions and mattresses we use when we rest, as well as the shells of televisions, washing machines, computers, and the various shapes of lamps and lanterns that give us light at night ......
Plastics have gradually replaced many Has been used for decades and centuries of materials and utensils, become an indispensable assistant in people's lives. Plastic set of metal hardness, lightweight wood, glass transparency, ceramic corrosion resistance, rubber elasticity and toughness in one, so in addition to daily necessities, plastics are more widely used in aerospace, medical equipment, petrochemical, machinery manufacturing, national defense, construction and other industries.
Properties of plastics?
1, plastic has plasticity?
As the name suggests, plastic is a material that can be molded. The so-called plasticity of plastic is a solid plastic can be softened by heating methods, and then put the softened plastic in the mold, let it cool down and re-solidify into a certain shape of the solid. This property of plastic also has certain defects, that is, it is easy to soften and deform when exposed to heat, and some plastics are even deformed when scalded with higher temperature water, so plastic products are generally not suitable for contact with boiling water.
2, plastic with elasticity?
Some plastics are also like synthetic fibers, with a certain degree of elasticity. When it is stretched by external forces, the curled molecules are straightened by the flexibility, but once the tension is canceled, it will return to the original curled state, which makes the plastic with elasticity, such as polyethylene and polyvinyl chloride film products. But some plastics are not elastic.?
3, plastic has high strength?
Plastic is not as hard as metal, but compared with glass, ceramics, wood, etc., still has a relatively high strength and wear resistance. Plastic can be made into strong gears and bearings in machines.?
4, plastic has corrosion resistance?
Plastic is not like metal in the humid air will rust, not like wood in the humid environment will rot or be microbial erosion, in addition to plastic acid and alkali corrosion resistance. Therefore plastics are often used as water and liquid pipelines in chemical plants, doors and windows in buildings, etc.?
5, plastic has insulating properties?
The molecular chain of plastic is the atoms to *** valence bond combined, the molecules can not be ionized, but also in the structure of the transfer of electrons, so the plastic has insulating properties. Plastic can be used to make the wrapping of wires, electric sockets, the shells of electrical appliances and so on.