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Ultrasound‐assisted synthesis of benzoxazine monomers: thermal and mechanical properties of polybenzoxazines
Author(s) -
Vengatesan Muthukumaraswamy Rangaraj,
Devaraju Subramani,
Kannaiyan Dinakaran,
Song Jang Kun,
Alagar Muthukaruppan
Publication year - 2013
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.4337
Subject(s) - monomer , curing (chemistry) , polymer chemistry , materials science , sonication , differential scanning calorimetry , polymerization , thermal decomposition , ultimate tensile strength , ether , phenol , flexural strength , chemical engineering , polymer , organic chemistry , chemistry , composite material , physics , engineering , thermodynamics
A series of benzoxazine monomers (P‐aea2–P‐aea8) were prepared from appropriate aromatic diamines containing linear aliphatic ether chains with phenol and formaldehyde through the Mannich reaction under ultrasonication and conventional methods. Based on the reaction performance, the ultrasonication method has been found to be more facile and convenient for the synthesis of benzoxazine monomer than the conventional method. The synthesized monomers undergo curing at a lower temperature than that of conventional benzoxazine (Ba‐A) monomer as evidenced from differential scanning calorimetric analysis. The presence of an aliphatic ether core in the benzoxazine monomer aids in lowering the curing temperature, which seems to vary linearly with chain length. Thermally polymerized benzoxazine (poly(P‐aea s )) shows an enhanced tensile and flexural strength. Copyright © 2012 Society of Chemical Industry