DETAILED KINETICS OF LIQUID-CRYSTALLINE COPOLYESTER SYNTHESIS - COPOLYESTERIFICATION BETWEEN POLY(ETHYLENE-TEREPHTHALATE), TEREPHTHALIC ACID AND HYDROQUINONE DIACETATE
Rs. Ghadage et al., DETAILED KINETICS OF LIQUID-CRYSTALLINE COPOLYESTER SYNTHESIS - COPOLYESTERIFICATION BETWEEN POLY(ETHYLENE-TEREPHTHALATE), TEREPHTHALIC ACID AND HYDROQUINONE DIACETATE, Macromolecular symposia, 122, 1997, pp. 235-241
The kinetics of liquid crystalline copolyester synthesis via melt tran
sesterification between poly(ethylene terephthalate)[PET], terephthali
c acid [TA] and hydroquinone diacetete [HQDA] is examined. A number of
assumptions are proposed and validated to simplify the kinetics and t
o make the analysis tractable. A key postulation is that the reaction
originates between terephthalic acid [TA] and hydroquinone diacetate [
HQDA] to form a dimer which slices PET chain. The subsequent coupling
of PET segments reforms PET chain with random incorporation of TA-HQDA
units. Steady state approximation is invoked for the rate of generati
on of dimer. The kinetic analysis reveals the implicit simplicity of c
omplex systems.