The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases. Polypropylene is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties. Chemical and physical properties Micrograph of polypropylene For example, making polypropylene from bio-based resources is a topic of interest in the 21st century. Interest in polypropylene development is ongoing to the present. Syndiotactic polypropylene was also first synthesized by Natta. This pioneering discovery led to large-scale commercial production of isotactic polypropylene by the Italian firm Montecatini from 1957 onwards. The stereoselective polymerization to the isotactic was discovered by Giulio Natta and Karl Rehn in March 1954. Paul Hogan and Robert Banks first demonstrated the polymerization of propylene in 1951. Polypropylene is the second-most widely produced commodity plastic (after polyethylene). īio-PP is the bio-based counterpart of polypropylene (PP). It is a white, mechanically rugged material and has a high chemical resistance. Its properties are similar to polyethylene, but it is slightly harder and more heat-resistant. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene ( PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications.
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