How do the thermal properties of PS-b-PEG copolymers change when blended with nanostructured SeO₂ and BN particles?

Label:chem

Topic
Thermal stability is an important factor for materials used in radiation shielding applications. Understanding the thermal degradation characteristics of PS-b-PEG copolymers blended with nanostructured particles helps in evaluating their suitability for high-temperature environments.

From: "Radiation Shielding Tests of Crosslinked Polystyrene-b-Polyethyleneglycol Block Copolymers Blended with Nanostructured Selenium Dioxide and Boron Nitride Particles", Nanomaterials 2022, 12(3), 297.
Answer
The thermogravimetric analysis (TGA) of PS-b-PEG copolymers blended with nanostructured SeO₂ and BN particles revealed that these nanocomposites exhibit good thermal stability. The TGA curves showed that the decomposition of the copolymers occurred in multiple stages, with the initial decomposition temperatures ranging from 45.0°C to 217.7°C, depending on the composition. The final decomposition stage occurred around 660.0°C, indicating that the nanocomposites retained structural integrity up to this temperature. The presence of SeO₂ and BN particles improved the thermal uniformity of the nanocomposites, acting as protective barriers against thermal degradation. The study concludes that the PS-b-PEG-based nanocomposites are thermally balanced and suitable for applications requiring high thermal stability.
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