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New fluorescent monomers and polymers displaying an intramolecular proton‐transfer mechanism in the electronically excited state. III. Thermogravimetric stability study of the benzazolylvinylene derivatives
Author(s) -
Campo Leandra Franciscato,
Rodembusch Fabiano Severo,
Stefani Valter
Publication year - 2005
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.22292
Subject(s) - thermogravimetric analysis , activation energy , thermal stability , differential scanning calorimetry , monomer , materials science , intramolecular force , polymer , polymer chemistry , kinetics , chemistry , thermodynamics , organic chemistry , physics , composite material , quantum mechanics
Six fluorescent benzazolylvinylene derivatives were studied by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and related molecular parameters. The thermal stability was determined in terms of the steps of degradation and its fitting parameters, such as maximum degradation rate ( R max ), maximum degradation rate temperature ( T R max ), degradation temperature range, which is related to the half‐width at half‐height values (Γ), and the kinetic parameters: activation energy ( E a ), pre‐exponential factor ( A ), and reaction order ( n ) obtained by Barrett's method. Different organic substitutes and heteroatoms do not play a fundamental role in the thermal behavior of the studied dyes. The compensation effect between pre‐exponential factor and activation energy was confirmed. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 495–500, 2006