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Flexible polybenzoxazine thermosets containing pendent aliphatic chains
Author(s) -
Agag Tarek,
Akelah Ahmed,
Rehab Ahmed,
Mostafa Salwa
Publication year - 2012
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.3156
Subject(s) - monomer , thermogravimetric analysis , polymer chemistry , differential scanning calorimetry , thermal stability , glass transition , polymerization , materials science , polymer , thermosetting polymer , fourier transform infrared spectroscopy , maleimide , dynamic mechanical analysis , chemical engineering , chemistry , organic chemistry , composite material , physics , engineering , thermodynamics
Abstract The rich chemistry of polybenzoxazines allows a wide range of molecular structure design by using appropriate starting materials. A new class of polybenzoxazines has been developed from benzoxazine monomers containing pendent long aliphatic chains. The monomers have been synthesized by the reaction of phenol or bisphenol A with two different long‐chain aliphatic amines. The chemical structure of the monomers was confirmed by 1 H nuclear magnetic resonance and Fourier transform infrared spectroscopy. The polymerization behavior of the monomers studied by differential scanning calorimetry shows exothermic peaks due to the ring‐opening polymerization of benzoxazine monomers centered at 247–255 °C. Dynamic mechanical analysis indicated that the glass transition temperatures T g were in the range 81–92 °C. The thermal stability of the polymers was also examined by thermogravimetric analysis, demonstrating that the weight loss temperatures decreased in comparison with that of traditional polybenzoxazine. Copyright © 2011 Society of Chemical Industry