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A novel polyhedral oligomeric silsesquioxane-modified layered double hydroxide: preparation, characterization and
Xianwei Zhang1, Zhongzhu Ma1, Hong Fan1
1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Beilstein Journal of Nanotechnology
|January 16, 2019
Summary
A new material combines layered double hydroxide with silsesquioxane, significantly reducing flammability. This offers enhanced thermal stability and low heat release for safer applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Layered double hydroxides (LDHs) are versatile materials with applications in catalysis, adsorption, and flame retardancy.
- Modifying LDHs with organic or inorganic components can enhance their properties for specific applications.
- Polyhedral oligomeric silsesquioxanes (POSS) are nanoscale silica structures with unique properties.
Purpose of the Study:
- To synthesize and characterize a novel material combining layered double hydroxide (LDH) with octa-substituted carboxy-terminated polyhedral oligomeric silsesquioxane (POSS).
- To investigate the thermal stability and flame retardant properties of the modified LDH (OLDH).
- To explore the synergistic effects between the siloxane and LDH components during thermal degradation.
Main Methods:
- One-step synthesis of POSS-modified LDH (OLDH).
- Characterization using Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, electron microscopy (TEM, SEM), elemental analysis, and thermogravimetric analysis.
- Evaluation of flame retardancy using microscale combustion calorimetry (MCC).
Main Results:
- The synthesized OLDH exhibited increased interlayer distance and nanoscale plate-like morphology.
- OLDH demonstrated improved thermal stability compared to unmodified LDH.
- A synergistic flame retardant effect was observed between the siloxane and Mg-Al hydroxide components.
- MCC results showed a significant decrease in heat release rate and total heat release for OLDH, indicating low flammability.
Conclusions:
- The novel POSS-modified LDH (OLDH) offers enhanced thermal stability and significantly reduced flammability.
- The material exhibits a synergistic effect between its components, contributing to its flame retardant properties.
- OLDH presents a promising alternative to conventional organic-modified LDHs for applications requiring low flammability.
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