Synthesis of new phosphorus-containing (co)polyesters using solid-liquid phase transfer catalysis and product...

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Development of safe and thermally stable solid polymer electrolytes is crucial for advanced energy storage.
• Existing electrolytes often face challenges with flammability and thermal degradation.

Purpose of the Study:

• To synthesize and characterize novel linear phosphorus-containing (co)polyesters for use as solid polymer electrolytes.
• To evaluate the thermal stability, flame retardancy, and ionic conductivity of these new materials.

Main Methods:

• Polycondensation of phenylphosphonic dichloride (PPD) with poly(ethylene glycol) (PEG 12000), with and without bisphenol A (BA), using solid-liquid phase transfer catalysis.
• Characterization using gel permeation chromatography, FT-IR, NMR spectroscopy, and thermal analysis.
• Flammability assessment via limiting oxygen index (LOI) and complexation with lithium triflate for conductivity measurements.

Main Results:

• Polymers synthesized with yields of 85.0-88.0% and inherent viscosities of 0.32-0.58 dL/g.
• Demonstrated flame retardancy with polymers beginning to decompose between 190 °C and 231 °C.
• Achieved ionic conductivities in the range of 10(-7)-10(-8) S cm(-1) after complexation with lithium triflate.

Conclusions:

• Linear phosphorus-containing (co)polyesters are promising candidates for safe and thermally stable solid polymer electrolytes.
• The incorporation of phosphorus enhances flame retardancy and thermal stability.
• Further research can optimize these materials for improved ionic conductivity in energy storage devices.