Polypropylene is a thermoplastic polymer that is widely used in various industries for its versatile properties. It is a type of plastic that is derived from the monomer propylene. Polypropylene is known for its high strength-to-weight ratio, excellent Chemical resistance, and good thermal stability.  Polypropylene is a lightweight material, making it suitable for applications where weight reduction is important, such as automotive parts, packaging, and textiles. It exhibits a high resistance to many chemicals, including acids, alkalis, and solvents. This property makes it suitable for containers, pipes, and other products that come into contact with aggressive substances.

Polypropylene is extensively used in packaging materials such as bottles, containers, and films. It offers excellent clarity, good impact resistance, and the ability to be molded into various shapes. Polypropylene fibers are used in the textile industry to produce non-woven fabrics, ropes, carpets, and geotextiles. It provides good abrasion resistance, moisture-wicking properties, and is often used in applications requiring durability. Polypropylene is used in the automotive sector for manufacturing various parts, including bumpers, interior trim, door panels, and battery cases. Its lightweight nature and impact resistance make it desirable for these applications.

According to the plastics industry report, polypropylene is one of the most widely used and basic polymers used in the world and the largest consumer of propylene is plastic industry. The name of this product is polypropylene (PP) and its chemical formula is -CH2-CH (CH3) n-. Polypropylene The polymerization of propylene is performed at relatively mild temperatures and pressures in the presence of the famous Ziegler-Nata catalyst. The presence of this catalyst forms an isotactic polymer that is able to crystallize up to about 90%.

Polypropylene is a thermoplastic polymer that is used in a wide range of applications including film and sheet, blow molding, injection molding, Food packaging, textiles, laboratory and medical equipment, pipes, industrial and construction applications, and automotive components. In addition, polymers made from propylene monomer are typically resistant to chemical solvents, bases, and acids. Which is characteristic of this polymer.

The propylene molecule has an asymmetric chemical structure, so its polymerization process can lead to three types of sequences in the resulting polymer structure. Due to the effects of spatial inhibition of methyl groups, the tail-to-tail sequence has a higher structural order than other types. Commercialized Ipp has a variety of properties that have led to its widespread use, especially in the plastics and fiber industry. One of the most important properties of this material compared to polymers such as polyamides is the lack of moisture absorption in it, which has made it a suitable option for many applications. The properties of this material can be improved by making some subsequent modifications. 

The most important improvements that are currently being made are the control of the degradation process, networking, operationalization, and branching. The structure of the polypropylene molecule is linear due to the nature of Ziegler-Nata catalysts, which leads to low melt strength. Low melt strength limits the use of this polymer in processes such as blow molding and thermoforming.

Polypropylene has a relatively high melting point, allowing it to withstand elevated temperatures. It retains its shape and mechanical properties under normal working conditions, making it suitable for applications that involve heat, such as automotive components and electrical appliances. Polypropylene has good electrical insulation properties, making it suitable for use in capacitors, electrical connectors, and other electronic components. It has low water absorption, which helps to maintain its mechanical strength and dimensional stability in moist environments. This feature makes it useful for outdoor applications and products exposed to water.