Effects of pure and intercalated halloysites on thermal properties of phthalonitrile resin nanocomposites
| Autor: | Shengnan Bai, Qingxin Zhang, Xiaoyu Shi, Xinyu Sun, Xinggang Chen, Minjie Wu, Xiaoyan Yu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Thermogravimetric analysis Nanocomposite Materials science Polymers and Plastics 02 engineering and technology Polymer Dynamic mechanical analysis engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Halloysite 0104 chemical sciences Phthalonitrile chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Materials Chemistry engineering Thermal stability Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Polymer Degradation and Stability. 177:109192 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2020.109192 |
| Popis: | In this work, composite materials with different halloysite nanotubes (HNTs) content as fillers were prepared by using phthalonitrile resin with alkyl center as matrix. In order to improve the dispersibility of HNTs in the polymers, phenylphosphonic acid (PPA) was used to treat HNTs. The results of Wide-angle X-ray Diffraction (WAXD), Fourier Transform Infrared spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and Scanning Electron Microscope (SEM) showed that when the mass ratio of PPA to HNTs was 2:1, the intercalation rate of HNTs was the highest. The thermomechanical properties, thermal stability and thermal oxidation stability of the composite were tested by Dynamic Mechanical Analysis (DMA) and Thermogravimetric analysis (TGA). The results indicated that the polymers with intercalated HNTs as fillers have better thermomechanical properties than those with pure HNTs as fillers. When the modified HNTs content was 7%, the storage modulus of the polymer increased by 16.52% and 15.43% at 30 °C and 380 °C, respectively. With the increase of fillers, the thermal stability of polymers with pure HNTs as fillers increased, while that of polymers with modified HNTs as fillers increased first and then decreased. On the other hand, the limit oxygen index (LOI) of the polymers also increased to some extent. The degradation and control of the nanocomposites at high temperature were discussed. SEM was used to observe the cross-section morphology and found that pure HNTs would agglomerate in the polymer. The thermal properties of the phthalonitrile resin were improved by using the wide source HNTs as fillers. |
| Databáze: | OpenAIRE |
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