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Title: Precipitation of LDPE-EPDM and LDPE-EVA mixtures from ternary solutions
Other Titles: European Polymer Journal
Authors: Esperidião, Maria Cecília Azevedo
Galembeck, Fernando
Issue Date: 1997
Abstract: 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.
Description: Texto completo: acesso restrito. p.1387–1393
URI: http://www.repositorio.ufba.br/ri/handle/ri/8297
ISSN: 0014-3057
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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