| Popis: |
The synthesis and production of polypropylene copolymers was a natural development in polyolefin technology after the initial discovery and industrial manufacture of the polypropylene homopolymer [1]. The production of random copolymers directly in the polymerization reactor significantly expanded the property envelope of this versatile polymer, giving lower melting resins with improved clarity, particularly in film form. Heterophasic copolymers with increased toughness and durability were developed by melt compounding blends of different preformed polyolefins. More recently, such polymer blends have been produced by polymerization of the monomers directly in the reactor. This is not only economically advantageous but has led to the tailoring of specific polymer structures with a unique balance of properties, enabling polyolefins to meet a wide range of industrial needs, from flexible packaging barrier films to stiff, impact resistant containers and engineered structural plastic applications. |
