Showing papers by "Hatsuo Ishida published in 2019"
TL;DR: A comprehensive review of benzoxazine resins using natural renewable raw materials is presented in this article, where the synthesis of polybenzoxazines from natural renewable materials has attracted interest because of the environmental impacts caused by conventional petroleum-based materials.
144 citations
TL;DR: In this article, a series of thermally stable resveratrol-based tri-functional benzoxazine resins have been synthesized using resvrol, different amines (aniline, 4-chloroaniline and 3-aminophenylacetylene) and paraformaldehyde.
63 citations
TL;DR: In this paper, an asymmetric bis(1,3-benzoxazine) monomer based on deoxybenzoin has been synthesized through Mannich condensation, and the chemical structure of this deoxy benzoin-based monomer has been confirmed using 1H NMR, 13C NMRI, FT-IR and elemental analysis.
51 citations
TL;DR: This study reports the preparation and characterizations of chitosan-azomethine derivatives containing oxazine ring as new crosslinked polymers prepared by functionalization with reactive benzoxazine precursors.
50 citations
TL;DR: In this paper, a new AB-type benzoxazine monomer, containing both maleimide and furan groups, was reported, which exhibits diversified polymerization mechanisms rather than the common single linear polymerization or linear polymerisation.
Abstract: We report a new AB-type benzoxazine monomer, containing both maleimide and furan groups, which exhibits diversified polymerization mechanisms rather than the common single linear polymerization or ...
49 citations
TL;DR: In this article, compressive molded phenolic resins were tested with high energy continuous-wave (CW) laser to study the laser ablation behavior, and the results revealed that the laser parameters including irradiation time and laser power density have a great effect on the ablation morphology and mass ablation rate.
29 citations
TL;DR: In this article, a novel ortho-phthalimide-functionalized benzoxazine monomer containing an orthonitrile group has been synthesized in order to further systematically evaluate the thermally induced structural transformation from benzoxazines resin to cross-linked polybenzoxazole.
Abstract: A novel ortho-phthalimide-functionalized benzoxazine monomer containing an ortho-nitrile group has been synthesized in order to further systematically evaluate the thermally induced structural transformation from benzoxazine resin to cross-linked polybenzoxazole. The chemical structure of the synthesized monomer has been confirmed by 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. Also supporting the detailed structure is 1H–13C heteronuclear multiple quantum coherence (HMQC), which identifies the local proton-carbon proximities. The polymerization behaviors, including the ring-opening polymerization of the oxazine rings and the cyclotrimerization of the nitrile functionalities, are studied by differential scanning calorimetry (DSC) and in situ FT-IR. In addition, the subsequent benzoxazole formation after polymerization has also been analyzed using thermogravimetric analysis (TGA) and magic-angle spinning (MAS) solid-state 13C NMR. The resulting cross-linked polybenzoxazole derived from the benzoxazine monomer exhibits exceptionally high thermal stability and low flammability, with an extremely high Td5 temperature (550 °C), a high char yield value (70%) and an extraordinarily low total heat release (THR of 7.6 kJ g−1).
25 citations
TL;DR: In this paper, Zirconium carbide (ZrC)-modified short carbon-fiber-reinforced phenolic-resin matrix composites have been successfully prepared.
13 citations