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

Poulakis, JG; Papaspyrides, CD

dc.contributor.author	Poulakis, JG	en
dc.contributor.author	Papaspyrides, CD	en
dc.date.accessioned	2014-03-01T01:13:18Z
dc.date.available	2014-03-01T01:13:18Z
dc.date.issued	1997	en
dc.identifier.issn	0921-3449	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12414
dc.subject	Dissolution/precipitation technique	en
dc.subject	Evaluation	en
dc.subject	Physical properties	en
dc.subject	Polypropylene	en
dc.subject	Recycling	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Dissolution	en
dc.subject.other	Distillation	en
dc.subject.other	Grain size and shape	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Recycling	en
dc.subject.other	Solvents	en
dc.subject.other	Tensile strength	en
dc.subject.other	Melt flow index (MFI)	en
dc.subject.other	Polypropylenes	en
dc.subject.other	polypropylene	en
dc.subject.other	article	en
dc.subject.other	depolymerization	en
dc.subject.other	dissolution	en
dc.subject.other	ecology	en
dc.subject.other	plastic industry	en
dc.subject.other	precipitation	en
dc.subject.other	recycling	en
dc.subject.other	technique	en
dc.subject.other	tensile strength	en
dc.subject.other	waste management	en
dc.title	Recycling of polypropylene by the dissolution/reprecipitation technique: I. A model study	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0921-3449(97)01196-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0921-3449(97)01196-8	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	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
heal.publisher	Elsevier Sci B.V., Amsterdam, Netherlands	en
heal.journalName	Resources, Conservation and Recycling	en
dc.identifier.doi	10.1016/S0921-3449(97)01196-8	en
dc.identifier.isi	ISI:A1997XL67100003	en
dc.identifier.volume	20	en
dc.identifier.issue	1	en
dc.identifier.spage	31	en
dc.identifier.epage	41	en