Are propylene and polypropylene the same thing? If not, what s the difference?

PolyethyleneThe differences with polypropylene are as follows:

1. The heat resistance is different.

Polypropylene is more heat-resistant than polyethylene, which typically melts at about 40 to 50 percent higher than polyethylene, about 160-170. Polyethylene bags are more suitable for use under 90.

2. Rigidity and tensile strength.

Different. The main characteristics of polypropylene are low density, mechanical properties are better than polyethylene, and have outstanding rigidity. At the same time, due to the high tensile strength of polypropylene, and then good bending resistance, it is called "100 fold glue".

3. Low temperature resistance is different.

The low temperature resistance of polypropylene is weaker than that of polyethylene, and the impact strength at 0 is only half of that at 20, while the brittle temperature of polyethylene can generally reach below 50; and with the relative molecular mass.

can be increased to a minimum of 140.

Polypropylene ethylene, also known as ethylene propylene rubber, is a kind of copolymer rubber with ethylene and propylene as the basic monomer after the invention of Ziegler-natta catalyst and the emergence of polyethylene and polypropylene, which is divided into two categories: ethylene propylene diene monomer (EPM) and ethylene propylene diene monomer (EPDM). The former is a copolymer of ethylene and propylene; The latter is a copolymer of ethylene, propylene, and a small amount of unconjugated diolefins.

Features:

EPR has many excellent properties that other general synthetic rubber does not have, coupled with the fact that the monomer is cheap and easy to obtain, and has a wide range of uses, it is one of the fastest growing among the seven major synthetic rubber varieties abroad since the 80s, and its output, production capacity and consumption rank third in developed countries, second only to styrene-butadiene rubber and butadiene rubber.

In 1998, the total production capacity of the world's EPR was about 1.02 million tons, and the consumption was 10,000 tons. According to preliminary statistics, consumption in 1999 was about 10,000 tons, and it is expected to reach 10,000 tons in 2003. 1998 The growth rate of demand for EPR in 2003 was higher than that of styrene-butadiene rubber and butadiene rubber.

Polypropylene is a thermoplastic resin made from the polymerization of propylene. According to the methyl arrangement, it can be divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene.

A kind of plastic material, many things in life are used in him, such as plastic bags, plastic bottles.

The composition of the internal structure is different, and the position of the methyl group is different.

Polypropylene (PP) is a thermoplastic resin made from the polymerization of propylene. According to the position of methyl arrangement, it is divided into three types: isometric polypropylene, random polypropylene and inter-conventional polypropylene.

2. PP performance: non-toxic, tasteless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, and can be used at about 100. The main characteristics of polypropylene are low density, its mechanical properties are better than that of low-pressure polyethylene, and it has outstanding rigidity and good heat resistance.

Can be used over 100. Basically, it does not absorb water, and has good chemical stability, except for concentrated sulfuric acid and concentrated nitric acid, it is almost very stable. It has excellent high-frequency electrical properties and is not affected by temperature, so it is easy to form.

The disadvantages are that the wear resistance is not high enough, the forming shrinkage rate is large, the low temperature is brittle, and the heat deflection temperature is also low.

Polyethylene (PE) is a thermoplastic resin prepared by polymerization of ethylene. In industry, it also includes copolymers of ethylene with a small amount of -olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest use temperature can reach -100 -70 °C), good chemical stability, and can resist the erosion of most acids and bases (not resistant to acids with oxidizing properties).

It is insoluble in general solvents at room temperature, has low water absorption and excellent electrical insulation.

4. PE performance: acid and alkali resistance, organic solvent resistance, excellent electrical insulation, and can still maintain a certain toughness at low temperature. Surface hardness, tensile strength.

There are three types of polyethylene: high-pressure, medium-pressure and low-pressure polyethylene. The raw material of the plastic tray is low-pressure polyethylene, and the high-pressure polyethylene is flexible; Low-pressure polyethylene is hard, hardy, and cold-resistant, and remains soft at -70.

5. High chemical stability, resistant to acid, alkali and organic fluxes. It has outstanding electrical properties and good radiation resistance. It can be applied to the metal surface by flame spraying method or electrostatic spraying method to achieve the purpose of friction reduction and corrosion prevention.

The disadvantage is that the mechanical strength is not high, and the heat deflection temperature is very low, so it cannot withstand high loads.