Curable benzoxazine/siloxane hybrid networks from renewable phenolics and glycerol


Buldum C. B., Gulyuz S., Yağcı Y., Kışkan B.

EUROPEAN POLYMER JOURNAL, vol.174, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 174
  • Publication Date: 2022
  • Doi Number: 10.1016/j.eurpolymj.2022.111329
  • Journal Name: EUROPEAN POLYMER JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Polybenzoxazine, Benzoxazine, Vanillin, Coumarin, Glycerol, Bio-hybrid, OLIGOMERIC SILSESQUIOXANE POSS, MECHANICAL-PROPERTIES, CARDANOL, POLYBENZOXAZINE, MONOMER, POLYMERIZATION, COMPOSITES, THIOAMIDE, GUAIACOL
  • Istanbul Technical University Affiliated: Yes

Abstract

Siloxane bearing benzoxazines from renewable phenolics such as vanillin and coumarin were prepared and reacted with glycerol by silyl ether exchange reactions to yield processable, soft, and curable bio-hybrid gels. Moreover, these benzoxazine-based gels were cured below 200 C favored by the catalytic effect of hydroxyl groups present on glycerol moieties to yield bio-hybrid polybenzoxazines. All the synthesized intermediates, gels, and ultimate networks were characterized by H-1,C- 13 NMR, FTIR, and UV-Vis analyses. The curing behavior and thermal stabilities of the monomers, glycerol-based gels and related polybenzoxazines were investigated by differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). Moreover, the activation energies of polymerization of benzoxazine monomers were determined by DSC using the Kissinger and Ozawa methods.