177 Polypropylene
Polypropylene (PP) is a thermoplastic polymer made from the polymerization of propylene monomers. PP belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. It is a white, mechanically rugged material and has high chemical resistance.
PP was first polymerized in 1951 by a pair of Phillips petroleum scientists named Paul Hogan and Robert Banks. Three years later in 1954, Italian chemist Giulio Natta produced the first PP resin in Spain by utilizing Ziegler-Natta catalysts developed for the polyethylene industry and applied the technology to propylene gas. The commercial production ...
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