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Volume :30 Issue : 2 2003      Add To Cart                                                                    Download

Study of chemical kinetics of poly (butylene terephthalate) based copolyesters

Auther : JOHNSON MATHEW*, NADER AL-OTAIBI**,ABDUL REHMAN KHAN & AMIR AL-HADAD

*Chemical Engineering Department, Kuwait University, P.O Box 5969, 13060 Safat, Kuwait

**Petrochemical Industries Company, Kuwait

ABSTRACT

Copolyesterification reactions using poly (butylene terephthalate) (PBT) 70 mole% and hydroquinone diacetate (HQDA) + isophthalic acid (IPA) (30 mole %), and PBT 50 mole %/ (HQDA + IPA) 50 mole % have been carried out using a melt polymerization route. Two different polyesterification catalysts (sodium acetate and zinc acetate), tried for this copolymerization work.

The PBT 70 mole % reactions were carried out at 265, 270, 275 and 280oC while the PBT 50 mole%/50% (HQDA + IPA) reaction were conducted at 240, 245, 250 and 255oC. A new second order kinetics model was developed and tried for these  polyesterification reactions.  The rate constants and activation energy have been determined and reported for this new system.

Key words: Acidolysis, copolyesterification, melt polyesterification.

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