Recycling of polypropylene by the dissolution/reprecipitation technique: I. A model study

 
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Recycling of polypropylene by the dissolution/reprecipitation technique: I. A model study (EN)

Poulakis, JG (EN)
Papaspyrides, CD (EN)

N/A (EN)

The dissolution/reprecipitation technique is proposed here for the recycling of polypropylene (PP). It comprises dissolution of the plastic in an appropriate solvent, reprecipitation by using a non-solvent, thorough washing of the material obtained and drying. Furthermore, the solvent mixtures involved are separated by fractional distillation for reuse. In this paper model experiments on virgin material, either in the form of pellets or of commercial pipes for hot water piping applications, are presented. Xylene/acetone proved to be a particularly effective solvent/non-solvent system. Further investigation was focused on the effect of sample history through successive recycling cycles. The recycled grades were evaluated in terms of the following properties: melt flow index (MFI), crystallinity, mechanical performance in tensile and impact mode and grain size analysis. The properties of the recycled grades proved to have no substantial difference from the starting material.The dissolution/reprecipitation technique is proposed here for the recycling of polypropylene (PP). It comprises dissolution of the plastic in an appropriate solvent, reprecipitation by using a non-solvent, thorough washing of the material obtained and drying. Furthermore, the solvent mixtures involved are separated by fractional distillation for reuse. In this paper model experiments on virgin material, either in the form of pellets or of commercial pipes for hot water piping applications, are presented. Xylene/acetone proved to be a particularly effective solvent/non-solvent system. Further investigation was focused on the effect of sample history through successive recycling cycles. The recycled grades were evaluated in terms of the following properties: melt flow index (MFI), crystallinity, mechanical performance in tensile and impact mode and grain size analysis. The properties of the recycled grades proved to have no substantial difference from the starting material. (EN)

journalArticle

Distillation (EN)
Grain size and shape (EN)
Evaluation (EN)
Solvents (EN)
plastic industry (EN)
tensile strength (EN)
Polypropylenes (EN)
dissolution (EN)
recycling (EN)
technique (EN)
polypropylene (EN)
Physical properties (EN)
Dissolution (EN)
Tensile strength (EN)
article (EN)
precipitation (EN)
ecology (EN)
Melt flow index (MFI) (EN)
depolymerization (EN)
Polypropylene (EN)
Dissolution/precipitation technique (EN)
Recycling (EN)
Precipitation (chemical) (EN)
waste management (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Resources, Conservation and Recycling (EN)

1997


Elsevier Sci B.V., Amsterdam, Netherlands (EN)



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