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[Chemical Knowledge]：Properties and Uses of Polyethylene

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Polyethylene is a kind of polymer compound widely used in the field of chemical production raw materials, with excellent properties and a wide range of uses. This article will detail the properties and uses of polyethylene.

1. the nature of polyethylene

1. Physical properties
polyethylene is a colorless, tasteless, odorless, transparent thermoplastic, with high resistance to low temperature performance, the lowest use temperature of up to -70 ~-100 ℃, and good chemical stability, can resist most of the acid and alkali erosion (not resistant to acid with oxidation properties). Insoluble in general solvents at room temperature, small water absorption, excellent electrical insulation performance.

2. Mechanical properties
The mechanical properties of polyethylene are general, the tensile strength is low, the creep resistance is not good, and the impact resistance is good. Impact strength LDPE>LLDPE>HDPE, other mechanical properties LDPE
3. Thermal properties
The heat resistance of polyethylene is not high, and it improves with the increase of relative molecular mass and crystallinity. It has good low temperature resistance and low embrittlement temperature, which increases with the increase of relative molecular mass and crystallinity.

4. Electrical properties
polyethylene has excellent electrical insulation and can be used for electrical insulation materials.

2. the use of polyethylene

1. film products
polyethylene is mainly used to make all kinds of film products, such as agricultural film, packaging film, industrial film and so on. Among them, LDPE and LLDPE are mainly used for packaging film and agricultural film; HDPE film grade is generally used for less demanding packaging purposes, the amount of use is less, but also mainly blown film, high molding temperature.

2. Injection molding products
Polyethylene can also be used for injection molding products, such as small containers, lids, daily necessities, plastic flowers, injection molding toys, etc.

3. Pipe
Polyethylene pipe has the advantages of light weight, corrosion resistance, low flow resistance, low price, etc., and is widely used in water supply, gas transportation, sewage and other pipeline systems.

In short, polyethylene, as an important raw material for chemical production, has excellent properties and a wide range of uses, which is of great significance for promoting the development of the chemical industry.

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