| 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. |
