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Temperature Dependent Studies of Molecular Interactions in a Low‐Molecular Weight Ester Diol Mixed with a Hyperbranched Polyester Additive
Author(s) -
Ziemer Antje,
Eichhorn KlausJochen,
Adam Gudrun,
Froeck Christian,
Voit Brigitte,
Kreitschmann Mirko,
Kierkus Paul
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200390101
Subject(s) - polyester , diol , viscosity , oligomer , polymer chemistry , mixing (physics) , materials science , phase (matter) , glass transition , intrinsic viscosity , chemical engineering , chemistry , polymer , composite material , organic chemistry , physics , quantum mechanics , engineering
In this paper the influence of the hyperbranched polyester based on 4,4‐bis(4‐hydroxyphenyl)valeric acid on the properties of an ester diol oligomer will be discussed. The hyperbranched polyester was added to an ester diol in different amounts and the resulting bulk viscosity values were measured. Surprisingly, the resulting viscosity depends on the mixing temperature of both substances. Glass transition temperatures gave an idea about the phase behavior in the blend. H bond formation in the ester diol was intensively studied by temperature dependent IR measurements. The weakening of H bonds in the ester diol oligomer with increasing temperature was proven by IR measurements and correlates with results from viscosity measurements. These changes allow increased interactions between the ester diol and the hyperbranched polyester which causes different viscosity values depending on the mixing temperature. The overall changes in the behavior of the mixture were proven by temperature dependent AFM measurements.Frequency dependent viscosity measurement for the mixture containing of 20 wt.‐% of the hyperbranched polyester.