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Kinetic studies on copolycondensation processes. V. Investigations on sequence distribution of fully aromatic copolyester by PMR spectroscopy
Author(s) -
Matlengiewicz M.,
Gibas M.,
Turska E.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070231110
Subject(s) - copolyester , comonomer , materials science , polymer chemistry , randomness , sequence (biology) , distribution (mathematics) , reagent , polymer , thermodynamics , polymer science , chemistry , copolymer , polyester , composite material , mathematics , mathematical analysis , biochemistry , statistics , physics
PMR spectroscopy and lanthanide shift reagents were used to determine sequence distribution of units of poly(dimethyldian‐phenolphtalein)terephthalate. The calculated values of degree of randomness confirm the theory that the copolyester obtained at the isokinetic temperature (200°C) has random distribution of comonomer units and copolyesters obtained at temperatures above and below this temperature have a tendency to form block units along the macromolecular chain.