Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications.


Here are some key points about polypropylene:

  1. Chemical Composition and Production:
    • Polypropylene is produced via chain-growth polymerization from the monomer propylene.
    • It belongs to the group of polyolefins and is partially crystalline and non-polar1.
  2. Properties:
    • Density: Polypropylene has a density of 855 g/cm³ in its amorphous form and 0.946 g/cm³ in its crystalline form.
    • Melting Point: The melting point of polypropylene ranges from 130 to 171°C (266 to 340°F; 403 to 444 K).
    • Mechanical Properties: It is slightly harder than polyethylene and has high chemical resistance.
    • Heat Resistance: Polypropylene is more heat-resistant than polyethylene.
    • Color: It is a white material.
    • Chemical Resistance: Polypropylene exhibits high chemical resistance1.
  3. History:
    • The polymerization of propylene was first demonstrated by Phillips Petroleum chemists J. Paul Hogan and Robert Banks in 1951.
    • The stereoselective polymerization to the isotactic form was discovered by Giulio Natta and Karl Rehn in March 1954.
    • Large-scale commercial production of isotactic polypropylene began in 1957 by the Italian firm Montecatini.
    • Ongoing research continues to explore making polypropylene from bio-based resources1.
  4. Applications:
    • Polypropylene is widely used in various fields, including:
      • Clothing
      • Medical devices
      • Plastic products
      • Fibers
      • Copolymers
      • Biaxially oriented polypropylene (BOPP)
      • Recycling
      • Repairing
    • It is the second-most widely produced commodity plastic after polyethylene1 2.

In summary, polypropylene is a versatile material with excellent properties, making it suitable for diverse applications in industry and everyday life1 2.


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