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INTERNAL STRUCTURE OF CO-INJECTION MOLDED PP/PP SPECIMEN
Abstract:An overview of the microstructural characteristics of co-injection molded isotactic polypropylene products is given. Polarized light optical microscopy is used for comparison of traditional injection molded and co-injection molded products' microstructure. It is shown that a transcrystalline layer occurs on the boundary of the skin and the core components when a nucleation agent was added to either of the components; this proves that this surface layer is not shear induced cylindritic structure. Also shown is a method for preparing β-phase transcrystalline structure capitalizing on the advantages of the co-injection molding technology.
Keywords:Polypropylene  Polymorphism  Co-injection molding  Morphology  Transcrystallization  Cylindritic structure  α-phase  β-phase  β-transcrystalline structure
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