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Thermal decomposition kinetics of thermotropic poly(oxybenzoate‐ co ‐trimethylene terephthalate)
Author(s) -
Wang XueSong,
Li XinGui,
Yan Deyue
Publication year - 2000
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 - 10.1002/1097-4628(20001209)78:11<2025::aid-app240>3.0.co;2-7
Subject(s) - thermogravimetric analysis , thermotropic crystal , materials science , copolymer , polymer chemistry , activation energy , kinetics , thermal decomposition , monomer , condensation polymer , thermal stability , decomposition , isothermal process , polymerization , chemical engineering , chemistry , thermodynamics , polymer , organic chemistry , composite material , liquid crystalline , physics , quantum mechanics , engineering
A new kind of thermotropic liquid crystalline, poly(oxybenzoate‐ co ‐trimethylene terephthalate), was prepared from p ‐hydroxybenzoic acid (B) and poly(trimethylene terephthalate) (PTT or T) by melting polycondensation. The monomer ratio of B to T is 60:40. The dynamic thermogravimetric kinetics of the copolymer B/T (60:40) and PTT in nitrogen were analyzed by four single heating rate techniques and two multiple heating rate techniques. The effects of the heating rate and the calculating technique on the thermostable and degradation kinetic parameters of the B/T copolymer and PTT are systematically discussed. The four single heating rate techniques used in this work include Friedman, Freeman‐Carroll, Chang, and the second Kissinger techniques, whereas the two multiple heating rate techniques are the first Kissinger and Flynn‐Wall techniques. Additionally, the isothermal thermogravimetric kinetics of B/T (60:40) in nitrogen were investigated by the Flynn technique. The activation energy, the order, and the frequency factor of the degradation reaction for B/T (60:40) copolymer are determined to be 185 kJ/mol, 1.8, and 7.14 × 10 13 min −1 , respectively. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2025–2036, 2000