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- W4295136157 abstract "• A novel 4-allyl-substituted 1,3-benzoxazine (P-a-[4]ally) was successfully synthesized. • The curing behaviors and kinetics of benzoxazines were studied in detail. • The thermal and dielectric properties of poly-benzoxazines were explored. In this paper, a novel 4-allyl-substituted 1,3-benzoxazine (P-a-[4]ally) was successfully synthesized based on the allylation reaction of aldimines. The chemical structures of intermediates (P-1 and P-2) and P-a-[4]ally were characterized by NMR spectra, and Fourier transform infrared (FT-IR) spectra. The polymerization and curing kinetics were studied by DSC and in-situ FT-IR, and the charge densities of atoms were calculated by Materials Studio. The activation energy of the curing reaction was 108.3 kJ·mol −1 by the Kissinger-Akahira-Sunose method and 111.0 kJ·mol −1 by the Ozawa method. Thermomechanical analysis (TMA), thermogravimetric analysis (TGA), and an Agilent impedance analyzer were used to investigate the thermal and dielectric properties of poly-benzoxazine (P(P-a-[4]ally)). The results revealed that the glass transition temperature ( T g ) of P(P-a-[4]ally) was 154 °C, the temperature at 5% weight loss ( T d,5% ) was 329 °C, the char yield was 21.2% at 800 °C under N 2 , and the dielectric constant was 3.33 at 1 MHz." @default.
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- W4295136157 date "2022-11-01" @default.
- W4295136157 modified "2023-09-27" @default.
- W4295136157 title "Synthesis, polymerization kinetics of 4-allyl-substituted 1,3-benzoxazine and properties of resulting polymer" @default.
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- W4295136157 doi "https://doi.org/10.1016/j.tca.2022.179350" @default.
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