What are the features of the PP material?
- Mar 01, 2018 -

What are the features of the PP material?

Physical properties:

Polypropylene is a non-toxic, odorless, odorless and highly crystalline polymer. Its density is only 0. 90--, "0. 91g/rm". It is one of the lightest varieties of all plastics. It is particularly stable for water, and water absorption in water is only 0. O1%, and the molecular weight is about 8 in case of 150 thousand. Good molding, but due to large shrinkage (1%~2.5%). Thick wall products are easy to sag, for some dimensional precision 22 mechanical properties:

The higher parts are difficult to meet the requirements. The gloss of the surface of the products is good and it is easy to color.

The crystallinity of polypropylene is high and the structure is regular, so it has excellent mechanical properties. The absolute value of mechanical properties of polypropylene is higher than that of polyethylene, but it still belongs to a low variety in plastic material, and its tensile strength can reach 30 MPa or a little higher.  Higher isotactic polypropylene has higher tensile strength

Strength, but with the increase of the isotactic index, the impact strength of the material decreased, but it dropped to a certain value and no longer changed.

Temperature and loading rate have a great influence on the toughness of polypropylene. When the temperature is higher than the vitrification temperature, the impact failure is ductile fracture, and the temperature is brittle fracture below the vitrification temperature, and the impact strength decreases greatly. Increasing the loading rate can increase the transition temperature of ductile fracture to brittle fracture. Polypropylene has excellent bending fatigue resistance, and its products can be flexed 106 times at normal temperature without damage.

But at room temperature and low temperature, the impact strength is poor because of its high molecular structure. The most prominent performance of polypropylene is the resistance to bending fatigue, commonly known as 100% adhesive.

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