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Study of the thermal evolution of the cyclic-oligomer formation in a cyclic-oligomer-free PET

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Vermylen, V Legras, Roger [UCL] Lodefier, P Devaux, Jacques [UCL] Mac Donald, WA Rozenberg, Raoul [UCL] de Hoffmann, Edmond [UCL]

A low percentage of cyclic oligomers can be found in poly(ethylene terephthalate) (PET) from its synthesis onward. In this article, a cyclic-oligomer-fr ee PET (COFP) obtained by solvent extraction was used to study the thermodynamics of the re-formation of cyclics from the melt. The cyclic-oligomer content re-increased into molten COFP, finally reaching an equilibrium. An analysis of the fraction of the re-formed cyclic oligomers showed that a majority of cyclic trimer (60-70%) was found at the equilibrium Before the establishment of the equilibrium, an unusual behavior was observed in the relative proportion of cyclic trimer and tetramer during the first steps of their formation that was probably due to a competition between kinetic and thermodynamic products. (C) 2000 John Wiley & Sons, Inc.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2000
Language Anglais
Journal information "Journal of Polymer Science. Part A, Polymer Chemistry" - Vol. 38, no. 3, p. 416-422 (2000)
Peer reviewed yes
Publisher John Wiley & Sons Inc (New York)
issn 0887-624X
e-issn 1099-0518
Publication status Publié
Affiliation UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
Keywords cyclic oligomer ; poly(ethylene terephthalate) ; cyclization
Links
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Bibliographic reference Vermylen, V ; Legras, Roger ; Lodefier, P ; Devaux, Jacques ; Mac Donald, WA ; et. al. Study of the thermal evolution of the cyclic-oligomer formation in a cyclic-oligomer-free PET. In: Journal of Polymer Science. Part A, Polymer Chemistry, Vol. 38, no. 3, p. 416-422 (2000)
Permanent URL http://hdl.handle.net/2078.1/43761