Premium
Semi‐rigid polyesters analysed using the “strong‐fragile” concept
Author(s) -
Saiter A.,
Hess M.,
Saiter J.M.,
Grenet J.
Publication year - 2001
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 - 10.1002/1521-3900(200109)174:1<165::aid-masy165>3.0.co;2-k
Subject(s) - fragility , polyester , differential scanning calorimetry , glass transition , materials science , polymer , polymer chemistry , rigidity (electromagnetism) , alkyl , composite material , thermodynamics , chemistry , organic chemistry , physics
Semi‐rigid polyesters from diphenyl dicarbonic acid and some branched propyl and butyl spacers have been investigated using Differential Scanning Calorimetry. From Δc p at Tg and the determination of the fragility index m, we studied the “strong‐fragile” behaviour of these materials. All the samples appear thermodynamically “strong” and “kinetically” fragile. A comparison of these results with those obtained from glass‐forming liquids leading to linear polymers ‐ such as PET, PCT, PEN or poly‐methyl (α‐n‐alkyl) acrylates ‐ shows that a modification of the polymer rigidity leads to change the fragility index m and the Δc p at the glass transition.