Effects of aromatic diboronic acid on thermal charateristics of polybenzoxazines based on phenol and aniline

Telli A. H., HACALOĞLU J.

EUROPEAN POLYMER JOURNAL, vol.108, pp.182-190, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 108
  • Publication Date: 2018
  • Doi Number: 10.1016/j.eurpolymj.2018.08.053
  • Journal Name: EUROPEAN POLYMER JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.182-190
  • Keywords: Polybenzoxazine, Aromatic diboronic acid, Thermal degradation, Direct pyrolysis mass spectrometry, RING-OPENING POLYMERIZATION, THERMOOXIDATIVE DEGRADATION, NANOCOMPOSITES, COMPOSITES, 1,3-BENZOXAZINES, DECOMPOSITION, STABILITY
  • Middle East Technical University Affiliated: Yes

Abstract

In this work, polybenzoxazines based on phenol and aniline were prepared by curing as-synthesized and purified monomers in the presence of aromatic diboronic acid, BDBA. Condensation reactions between BOH groups of diboronic acid and phenolic OH groups of benzoxazine took place during curing only when unreacted phenol, or low mass oligomers were present in the medium. Generation of fragments involving B-O-C groups and significant improvement in thermal characteristics were detected upon curing the as-synthesized monomer in the presence of even 5 wt %BDBA. On the other hand, enhancement in thermal characteristics was not detected for the polybenzoxazine prepared by curing the purified monomer, when the wt % of BDBA was lower than 15%.