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Flame-Resistant Poly(vinyl alcohol) Composites with Improved Ionic Conductivity.
Diana Serbezeanu1, Corneliu Hamciuc1, Tăchiță Vlad-Bubulac1
1Department of Polycondensation and Thermally Stable Polymers, "Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania.
Membranes
|July 28, 2023
Summary
Flame-resistant polymer composites using polyvinyl alcohol (PVA) were enhanced with flame retardants and nanoparticles. These materials show improved fire resistance and conductivity, making them suitable for Li-ion batteries.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrochemistry
Background:
- Polyvinyl alcohol (PVA) is a versatile polymer matrix.
- Developing flame-resistant and conductive materials is crucial for energy storage applications.
- Incorporating flame retardants and conductive fillers can enhance composite properties.
Purpose of the Study:
- To prepare flame-resistant polymer composites based on PVA.
- To enhance the ionic conductivity of PVA composites for potential use in Li-ion batteries.
- To investigate the effect of flame retardants, BaTiO3, graphene oxide, and LiClO4 on material properties.
Main Methods:
- Polymer composite preparation using polyvinyl alcohol (PVA), polyphosphonate (flame retardant), and oxalic acid (crosslinking agent).
- Incorporation of LiClO4, BaTiO3, and graphene oxide (GO) to enhance ionic conductivity.
- Characterization using infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and microscale combustion tests.
- Evaluation of dielectric properties via Broad Band Dielectric Spectroscopy and measurement of electrical conductivity.
Main Results:
- Composites incorporating flame retardant (PFRV), BaTiO3, and graphene oxide (GO) exhibited increased fire resistance compared to control samples.
- TGA showed enhanced residue quantity at 700 °C from 7.9 wt% to 23.6 wt% with PFRV and BaTiO3.
- LiClO4 significantly improved electrical properties, including permittivity and conductivity.
- The composite with 35 wt% LiClO4 achieved the highest AC conductivity of 2.46 × 10^-3 S/m.
- A relaxation peak was observed in dielectric losses above 103 Hz.
Conclusions:
- The developed PVA-based composites demonstrate enhanced flame resistance and ionic conductivity.
- The addition of PFRV, BaTiO3, GO, and LiClO4 effectively modifies the material's thermal and electrical characteristics.
- These improved composites show significant potential for application in the manufacturing of Li-ion batteries.
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