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Synthesis and characterization of 4,4′‐diaminodiphenyl methane‐based benzoxazines and their polymers
Author(s) -
Men Weiwei,
Lu Zaijun
Publication year - 2007
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.26820
Subject(s) - glass transition , char , thermal stability , phenol , polymer chemistry , fourier transform infrared spectroscopy , curing (chemistry) , formaldehyde , polymer , bisphenol , diamine , materials science , bisphenol a , chemistry , epoxy , nuclear chemistry , chemical engineering , organic chemistry , pyrolysis , engineering
A series of diamine‐based benzoxazine precursors have been prepared using 4,4′‐diaminodiphenyl methane, formaldehyde, and different phenol derivatives including phenol, p ‐cresol, and 2‐naphthol. Their chemical structures were identified by FTIR, 1 H NMR, and elemental analysis. The curing reactions of those precursors were monitored by FTIR and DSC. The obtained materials exhibited higher glass transition temperature and char yields than the corresponding bisphenol‐A based polybenzoxazines. The polybenzoxazine prepared from phenol showed the highest char yields of 65% and thermal stability with 5 and 10% weight‐loss temperatures at 346 and 432°C, respectively. The polybenzoxazine prepared from 2‐naphthol exhibited the highest glass transition temperature at 244°C. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007