Supercritical fluid extraction of cyclic oligomers from depolymerizing PBT

C. Weijers, R.D. De Rooij, U.S. Agarwal, G. De Wit, P.J. Lemstra

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

4 Citaten (Scopus)


Cyclic oligomers of polyester show great potential for a reaction-injection-molding process, because of their initial low viscosity and rapid ring-opening polymerization at low temperatures (180°C) without exothermic reaction or condensates. In this work, we report the synthesis of cyclic oligo(butylene terephthalate) (COBT) from linear poly(butylene terephthalate) by a formation-extraction process employing supercritical fluids (SCF) CO2 and pentane at T = 230°C and P = 250 bar. Following this, depressuriza tion of SCF leads to easy recovery of the COBTs. When compared with SCF CO2, SCF pentane is found to be an attractive solvent because of its higher solubilizing capacity (0.8 mg COBT dimer/g pentane) for the COBTs.

Originele taal-2Engels
Pagina's (van-tot)4487-4492
Aantal pagina's6
TijdschriftJournal of Applied Polymer Science
Nummer van het tijdschrift6
StatusGepubliceerd - 15 sep 2006

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