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A dynamic FT‐IR method for determining the curing temperature ranges of an acetylene‐terminated polyisoimide prepolymer
Author(s) -
Huang W. X.,
Wunder S. L.
Publication year - 1996
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/(sici)1097-4628(19960118)59:3<511::aid-app17>3.0.co;2-w
Subject(s) - isomerization , prepolymer , differential scanning calorimetry , curing (chemistry) , acetylene , activation energy , polymer chemistry , materials science , chemical reaction , reaction mechanism , infrared spectroscopy , photochemistry , chemistry , catalysis , organic chemistry , thermodynamics , composite material , polyurethane , physics
A dynamic FT‐IR method was used to determine the individual curing temperature ranges of the isoimide‐imide isomerization and crosslinking reactions of an acetylene‐terminated polyisoimide prepolymer. The individual curing temperature ranges of these two types of chemical reactions for the polyisoimide system using differential scanning calorimetry (DSC) were totally overlapped. Using dynamic FT‐IR spectroscopy, the curing temperature ranges of the isomerization and crosslinking reactions were clearly separated. The isomerization reaction began at lower temperatures than the crosslinking reaction and was complete when only half of the crosslinking reaction had occurred. The temperature width, Δ T 1/2 , was twice as great for the crosslinking reaction compared with the isomerization reaction. Activation energies from dynamic FT‐IR spectroscopy can be obtained for the two separate reactions, however, for the reactions considered here, the activation energies were similar, 26 kcal/mol for the isomerization reaction and 23 kcal/mol for the crosslinking reaction. © 1996 John Wiley & Sons, Inc.