The high thermal stability of this class of polybenzoxazines is a combined result of polymerization of acetylene terminal functional group and oxazine ring-opening polymerization. The high char yield achieved for this class of materials is in the range of 71–81% by weight at 8008C in a nitrogen atmosphere and 30% by weight at 7008C in air as it is determined by thermogravimetric analysis (TGA). Temperature at 10% weight loss (T10%) is in the range of 520–6008C. The polymerization and post-cure reactions of these benzoxazines are studied by differential scanning calorimetry (DSC). The char formation of the blend of an acetylene-functional benzoxazine with an analogous benzoxazine without acetylene group is also studied by TGA.
Посилання на статтю:
Synthesis and thermal characterization of polybenzoxazines based on acetylene-functional monomers / H.J. Kim, Z. Brunovska, H. Ishida // Polymer. – 1999. – N 40. – P. 6565–6573.