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Detailed kinetics of liquid crystalline copolyester synthesis: Copolyesterification between poly(ethylene terephthalate), terephthalic acid and hydroquinone diacetate
Author(s) -
Ghadage Ramesh S.,
Lodha Anjali,
Mathew Johnson,
Ponrathnam Surendra,
Prasad Sudarshan D.
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971220137
Subject(s) - copolyester , terephthalic acid , hydroquinone , transesterification , ethylene , dimer , materials science , kinetics , dimethyl terephthalate , pyrogallol , polymer chemistry , poly ethylene , polyester , organic chemistry , chemistry , catalysis , composite material , physics , quantum mechanics
The kinetics of liquid crystalline copolyester synthesis via melt transesterification between poly(ethylene terephthalate)[PET], terephthalic acid [TA] and hydroquinone diacetate [HQDA] is examined. A number of assumptions are proposed and validated to simplify the kinetics and to 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 generation of dimer. The kinetic analysis reveals the implicit simplicity of complex systems.