High-temperature hybrid phthalonitrile/amino-MMT nanocomposites: Synthesis, structure, properties
Hybrid nanocomposites based on heterocyclic network, obtained from bisphenol A based phthalonitrile (BAPhN) with different (0.03–5.0 wt%) contents of reactive amino-montmorillonite (MMT) nanolayers, were synthesized and studied for the first time. Their structure, dynamics, thermal, relaxation and elastic properties were characterized using transmission electron microscopy (TEM), mid-infrared (mid-IR), far-infrared (far-IR) and energy dispersive X-ray (EDX) spectroscopies, differential scanning calorimetry (DSC), and by dynamic mechanical analysis (DMA) and thermogravimetry (TGA) measurements performed in both air and nitrogen mediums at temperatures from 20 to 600–900°C. Depending on nanofiller content, different extents of MMT stacks exfoliation, from single nanolayers to MMT stacks with tens nanolayers-thickness, are observed in the nanocomposites. The pronounced dynamic heterogeneity in the glass transition and the ‘constrained dynamics’ effects are shown. For the pristine matrix, Tg (DMA) = 446 °С varying from 460 to 570 °С for the nanocomposites. After high-temperature treatment in N2 medium, the relaxation spectrum and glass transition disappear, and constant dynamic modulus E′ ≈ 3 GPa at 20–600°С is registered. A satisfactory thermal stability of the nanocomposites, with retaining the sample integrity is observed at temperatures up to ~500 °C in air and up to 900 °C in N2 medium.
nanocomposites, phthalonitrile/amino-MMT, synthesis, structure, properties, article
High-temperature hybrid phthalonitrile/amino-MMT nanocomposites: Synthesis, structure, properties [electronic resource] / Bershtein V. A., Fainleib A. M., Yakushev P. N., Kirilenko D. A., Gusakova K. G., Markina D. A., Melnychuk O. G., Ryzhov V. A. // Express Polymer Letters. - 2019. - Vol. 13, Issue 7. - P. 656-672.