Benzoxazine is a kind of thermosetting resin developed rapidly in recent years.Compared with traditional resins,such as phenolic resin and epoxy resin,benzoxazine resin has good thermal stability,excellent flame retardancy,high mechanical strength and stable insulation.A new bisfunctional benzoxazine monomer,AI-ac,was synthesized by Mannich reaction using o-acetamide bisphenol,formaldehyde solution and m-aminobenzene acetylene as raw materials.Its polymerized products,both polybenzoxazine (poly(AI-ac)) and polybenzoxazole (PBO-AI-ac) were obtained by heating treatment.The chemical structure of benzoxazine was characterized by 1H and 13C NMR and fourier transform infrared (FT-IR) spectra.The polymerization of monomers was studied by differential scanning calorimetry (DSC) and in situ FT-IR.The thermal stability and mechanical properties of the thermosets were studied by thermogravimetric analysis (TGA),TMA and DMA.The results shown that AI-ac oxazine monomer had lower curing temperature.Moreover,poly(AI-ac) and PBO-AI-ac had good thermal stability and excellent dielectric properties.Carbon residue values of poly(AI-ac) and PBO-AI-ac in nitrogen atmosphere at 800℃ were 65% and 70%,respectively.
Han Mengchao, Liu Shihai, Sheng Weichen, Zhang Kan
. Synthesis,thermal and dielectric properties of ortho-amide bisfunctional benzoxazine resin[J]. New Chemical Materials, 2020
, 48(8)
: 156
-159
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.08.034
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