Site-resolved X-ray scattering studies, II the morphology in injection-molded PP foams
| Autor: | Peter Zipper, Strashimir Djoumaliisky |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Morphology (linguistics)
Materials science Polymers and Plastics business.industry Scattering Organic Chemistry X-ray Condensed Matter Physics medicine.disease_cause Cylinder (engine) law.invention Optics law Mold Materials Chemistry medicine Texture (crystalline) Composite material business Injection molding machine Intensity (heat transfer) |
| Zdroj: | Macromolecular Symposia. 181:421-426 |
| ISSN: | 1521-3900 1022-1360 |
| Popis: | PP-structural foam moldings, composed of three co-axial cylinders were produced on an on-line injection molding machine in a prepressurized mold cavity by the classical low-pressure process and an alternative low-pressure process. Melt temperature, injection direction and sprue diameter were varied. Cross-sections cut from the middle of the small cylinder in longitudinal orientation were investigated by site-resolved X-ray scattering techniques in three different experiments: (i) wide-angle scans of the cross-sections, resulting in two-dimensional intensity maps; (ii) measurements of azimuthal intensity distributions of the principal PP reflections, for selected positions in the cross-sections; (iii) again for selected positions, small-angle measurements interpreted in terms of long periods. The comparison of the results derived from the different samples in the different experiments allows far-reaching statements about the influence of melt temperature, sprue dimension and position, and the type of process on the morphology and texture in the smallest cylinder of the moldings. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text