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Volume :28 Issue : 2 2001      Add To Cart                                                                    Download

Application of parameter estimation techniques to analyze the kinetics of liquid crystalline copolyesters

Auther : GHAZI AL-ENEZI, JOHNSON MATHEW, MANSOUR KARKOUB AND ALI ELKAMEL

College of Engineering and Petroleum, Kuwait University, P.O. Box 5969, 13060 Safat, Kuwait

ABSTRACT 

Kinetics of copolyesterification between poly(butylenes terephthalate) PBT and 4-acetoxy benzoic acid (ABA) in the melt have been analyzed using a simple approach. A simple second order reaction sequence summarizes catalysed and uncatalysed reactions between ABA and PBT. The kinetic parameters for the copolymerization reaction were determined using a simultaneous non-linear programming method. This technique was used to compute the moles of ABA reacted. This data was compared to that of the experimentally determined data. Close comparison (R.M.S. error ±0.003) was obtained between the experimental and theoretical data. The kinetic data support block copolyester formation. The thermal data also gave support to this behavior. 

Keywords: Copolymers; kinetics; LCP’s; poly(butylene terephthalate)

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