Abstract
This paper is directed towards the development of safe, and thermally stable solid polymer electrolytes. Linear phosphorus-containing (co)polyesters are described, including their synthesis, thermal analysis, conductivity, and non-flammability. Polycondensation of phenylphosphonic dichloride (PPD) with poly(ethylene glycol) (PEG 12000) with and without bisphenol A (BA) was carried out using solid-liquid phase transfer catalysis. Potassium phosphate is used as base. Yields in the range of 85.0–88.0%, and inherent viscosities in the range of 0.32–0.58 dL/g were obtained. The polymers were characterized by gel permeation chromatography, FT-IR, 1H- and 31P-NMR spectroscopy and thermal analysis. Their flammability was investigated by measuring limiting oxygen index values. The polymers are flame retardants and begin to lose weight in the 190 °C–231 °C range. Solid phosphorus- containing (co)polyesters were complexed with lithium triflate and the resulting ionic conductivity was determined. Conductivities in the range of 10−7–10−8 S cm−1 were obtained.
Highlights
Polyphosphoesters are an important class of phosphorus-containing polymers because of their specific properties, e.g., a good flame resistance, plasticity, lubricant properties and good heat stability.Polyphosphoesters contain repeated phosphoester bonds in the backbone and are structurally versatile, biocompatible, and biodegradable through hydrolysis as well as enzymatic digestion under physiological conditions
This paper presents the synthesis of linear phosphorus-containingpolyesters by solid-liquid phase transfer catalysis polycondensation of phenylphosphonic dichloride (PPD) with poly(ethylene glycol) (PEG 12000) with and without bisphenol A (BA) (Scheme 2)
In order to prevent the degradation ofpolymers, reduce the competing end reactions and get data for preparing thermally stablepolymers we have synthesized phosphorus solid polymer electrolytes by phase transfer catalysis (PTC) in a solid-liquid system, where potassium phosphate is used as base [24]
Summary
Polyphosphoesters are an important class of phosphorus-containing polymers because of their specific properties, e.g., a good flame resistance, plasticity, lubricant properties and good heat stability. Polyphosphoesters contain repeated phosphoester bonds in the backbone and are structurally versatile, biocompatible, and biodegradable through hydrolysis as well as enzymatic digestion under physiological conditions. Depending on the nature of the side group connected to the phosphorus atom, the polymers are called polyphosphates, polyphosphonates, or polyphosphites, as shown in Scheme 1 [1].
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