The effect of aromatic diboronic acid on characteristics of polybenzoxazine based on phenol and 4-aminomethylbenzoate

İPEK H., HACALOĞLU J.

JOURNAL OF POLYMER RESEARCH, vol.25, no.12, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 12
  • Publication Date: 2018
  • Doi Number: 10.1007/s10965-018-1656-6
  • Journal Name: JOURNAL OF POLYMER RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Middle East Technical University Affiliated: Yes

Abstract

In this study, a polybenzoxazine, (PPab) based on phenol and 4-aminomethyl benzoate and its composites containing various amounts of 1,4-benzene diboronic acid, (BDBA) were synthesized by stepwise curing. It has been determined that both thermal stability and char yield were increased as the amount of BDBA incorporated was increased. The improvements in thermal characteristics were associated with condensation reactions of B-OH of BDBA and not only with hydroxyl groups of polybenzoxazine but also ester groups on the aniline linkages yielding a highly cross-linked structure. In addition, self-condensation reactions of B-OH groups generated boroxine net-work. Strong evidences for growth of this net-work on benzoate units of the polymer were detected.