Twice-Functionalized Montmorillonite Nanosheets for Polymer-Derived MMT-SiOC Nanocomposites: Phase Formation and Porosity.

ABSTRACT: In this study, montmorillonite (MMT) nanosheets are purified and exfoliated from a crude clay source and further twice-functionalized with cetritrimethylammonium bromide and [3-(2-aminoethylamino)propyl]trimethoxysliane (AEAPTMS) to promote dispersion in the preceramic polymer. Phase profiles and compositions of MMT nanoflakes and MMT-silicon oxycarbide (SiOC) are characterized with X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. The microstructures are examined by scanning and transmission electron microscopy. MMT nanoflakes are randomly dispersed in the SiOC matrix with α-quartz forming at the MMT-SiOC interface. Pyrolysis to 1400 °C induced the formation of SiC nanowhiskers that are observed up to 20 µm in length and 200 nm in diameter. After selective etching

SUBMITTER: Rau AV 

PROVIDER: S-EPMC12067154 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature