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https://repositorio.ufba.br/handle/ri/8297
metadata.dc.type: | Artigo de Periódico |
Título : | Precipitation of LDPE-EPDM and LDPE-EVA mixtures from ternary solutions |
Otros títulos : | European Polymer Journal |
Autor : | Esperidião, Maria Cecília Azevedo Galembeck, Fernando |
metadata.dc.creator: | Esperidião, Maria Cecília Azevedo Galembeck, Fernando |
Resumen : | The fast precipitation of mixtures of low-density polyethylene (LDPE) with ethylene-propylene-diene terpolymer (EPDM) and ethylene-vinyl acetate (EVA) copolymer, from xylene solutions by cooling, leads to fractionation of the mixtures. LDPE/EPDM mixtures are also fractionated by cooling followed by nonsolvent addition. Studies by density-gradient centrifugation, IR spectroscopy, optical microscopy and wide-angle X-ray diffraction showed that the composition and morphology of LDPE/EPDM fractions depend on the precipitation procedures. LDPE crystalline structure in each fraction is different, changes with the time and depends on EPDM content. EVA fractions that co-precipitate are richer in -CH2-CH2-units. LDPE/EPDM and LDPE/EVA precipitates showed chemical composition distribution and morphological characteristics different among themselves. Larger aggregates were observed in the LDPE/EPDM precipitates. These differences were attributed to differences in the phase diagrams and in the phase separation mechanisms. |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/8297 |
Fecha de publicación : | 1997 |
Aparece en las colecciones: | Artigo Publicado em Periódico (Química) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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ESPERIDIão.pdf Restricted Access | 867,52 kB | Adobe PDF | Visualizar/Abrir Request a copy |
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