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Infrared and thermal analyses of polybenzoxazine and polycarbonate blends
Author(s) -
Ishida Hatsuo,
Lee YuHsin
Publication year - 2001
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.1524
Subject(s) - polycarbonate , differential scanning calorimetry , thermogravimetric analysis , materials science , fourier transform infrared spectroscopy , curing (chemistry) , polymer chemistry , polymerization , glass transition , isothermal process , monomer , polymer , chemical engineering , composite material , thermodynamics , physics , engineering
Abstract The thermal properties of physical blends containing benzoxazine monomer and polycarbonate (PC) were studied by nonisothermal differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). The ring‐opening reaction and subsequent polymerization reaction of the benzoxazine were inhibited significantly by the presence of polycarbonate. The glass‐transition temperature of the resulting blends decreased as the concentration of polycarbonate increased and deviated markedly from the Fox equation. An earlier degradation event appeared in the blend with 11 and 33 wt % of PC. In addition, FTIR was used to study the extent of the polymerization reaction as well as the hydrogen‐bonding behavior. Intermolecular hydrogen bonding between PC and cured polybenzoxazine appeared after 1 h of isothermal curing at 180°C and continued throughout the entire curing process. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1021–1034, 2001