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Título: | New aspects of the β-α Polymorphic transition in plastically deformed isotactic polypropylene studied by microindentation hardness |
Autor: | Boyanova, M.; Baltá Calleja, Francisco José CSIC ORCID; Fakirov, S. | Fecha de publicación: | 1-sep-2006 | Editor: | Springer Nature | Citación: | Journal of Materials Science 41: 5504-5509 (2006) | Resumen: | The β-α polymorphic transition in plastically deformed isotactic polypropylene (iPP) was characterized by means of microindentation hardness. For this purpose microindentations were mapped onto the surface of the necking zone of a tensile loaded injection molded β-iPP "dumb-bell" specimen. Results evidence a sharp decrease of the H-values instead of the expected H-increase due to the β-α polymorphic transition. Far away from the necking zone an H-increase is detected. It is shown that the destruction of the starting isotropic spherulitic structure and the decrease of crystallinity in the necking zone gives rise to lower H-values. However, at larger distances from the neck, the emerging fibre structure induces a better chain orientation that results in a slight H-increase. Analysis of the isotropic and necked samples before and after their annealing using DSC and WAXS supports the assumption regarding the role of the microvoids in decreasing the hardness value. | Descripción: | 6 pags., 5 figs. | Versión del editor: | http://dx.doi.org/10.1007/s10853-006-0323-1 | URI: | http://hdl.handle.net/10261/237280 | DOI: | 10.1007/s10853-006-0323-1 | Identificadores: | doi: 10.1007/s10853-006-0323-1 issn: 0022-2461 |
Aparece en las colecciones: | (CFMAC-IEM) Artículos |
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polymorphic transition.pdf | 718,73 kB | Adobe PDF | Visualizar/Abrir |
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