Supermolecular structure of injection-molded polypropylene products is inhomogeneous. The samples possess a double skin 150-300 mu m thickness, nonresolvable on the optical level, while the inner part of the samples is of spherulitic structure. The inner part of the shell has been shown with the aid of structural memory effect to be consisted of oriented in direction of injection-molding cylindrites. Crystallization process taking place during injection-molding can be reconstructed through the structural memory effect. Cylindritic bands are formed in the basically spherulitic sample along the conflux lines of the fronts of melt. The conflux lines are to be considered as weak sites from mechanical point of view.
|Number of pages||12|
|Journal||Periodica Polytechnica Chemical Engineering|
|Publication status||Published - Jan 1 1984|
ASJC Scopus subject areas
- Chemical Engineering(all)