High-temperature hybrid phthalonitrile/amino-MMT nanocomposites: Synthesis, structure, properties

eXPRESS Polymer Letters

V. A. Bershtein¹ 

关键词: nanocomposites;    phthalonitrile/amino-MMT;    synthesis;    structure;    properties;   

DOI  :  10.3144/expresspolymlett.2019.55

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

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 studiedfor the first time. Their structure, dynamics, thermal, relaxation and elastic properties were characterized using transmissionelectron 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) measurementsperformed 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 dynamicmodulus E′ ≈ 3 GPa at 20–600°С is registered. A satisfactory thermal stability of the nanocomposites, with retaining thesample integrity is observed at temperatures up to ~500 °C in air and up to 900 °C in N2 medium.

【 授权许可】

CC BY