Restabilization of recycled, CaCO3-filled polypropylene: Assessment of reprocessing induced modifications and processing stabilizer effectiveness

Tsenoglou, CJ; Kartalis, CN; Papaspyrides, CD; Pfaendner, R

dc.contributor.author	Tsenoglou, CJ	en
dc.contributor.author	Kartalis, CN	en
dc.contributor.author	Papaspyrides, CD	en
dc.contributor.author	Pfaendner, R	en
dc.date.accessioned	2014-03-01T01:18:17Z
dc.date.available	2014-03-01T01:18:17Z
dc.date.issued	2002	en
dc.identifier.issn	0730-6679	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14924
dc.subject	Chain scission	en
dc.subject	Degradation	en
dc.subject	Polypropylene	en
dc.subject	Processing	en
dc.subject	Recycling	en
dc.subject	Rheology	en
dc.subject	Stabilizer	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Calcium compounds	en
dc.subject.other	Chemical modification	en
dc.subject.other	Degradation	en
dc.subject.other	Molecular weight	en
dc.subject.other	Recycling	en
dc.subject.other	Thermal effects	en
dc.subject.other	Viscosity measurement	en
dc.subject.other	Calcium carbonate	en
dc.subject.other	Processing stabilizer	en
dc.subject.other	Polypropylenes	en
dc.title	Restabilization of recycled, CaCO3-filled polypropylene: Assessment of reprocessing induced modifications and processing stabilizer effectiveness	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/adv.10026	en
heal.identifier.secondary	http://dx.doi.org/10.1002/adv.10026	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Postconsumer recycled polypropylene, filled with 15% CaCO3 was restabilized at various degrees utilizing different processing stabilizers, one of which is especially prepared to counter the deactivating effects of fillers and other moieties. The polymer was then subjected to multiple extrusion cycles for the purpose of studying the effects of the extent and temperature of reprocessing on its chemical stability. The relative effectiveness of the various restabilization recipes used was also examined. The process-induced material degradation is primarily due to chain scission, which causes an average molecular weight reduction; its progression was monitored by measuring the decrease in viscosity. It is determined that degradation increases linearly with the extent of reprocessing while its activation energy is roughly equal to 30 kJ/mol. A simple model is built and used to quantitatively evaluate the potency of each additive used; it presumes that the protection of each individual stabilizer may be explicitly factored out in a product expression. These results suggest useful ways of optimizing stabilization according to the particular processing and product requirements. (C) 2002 Wiley Periodicals, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Advances in Polymer Technology	en
dc.identifier.doi	10.1002/adv.10026	en
dc.identifier.isi	ISI:000178710600004	en
dc.identifier.volume	21	en
dc.identifier.issue	4	en
dc.identifier.spage	260	en
dc.identifier.epage	267	en