What is the morphological characterization of PS-b-PEG copolymers blended with nanostructured SeO₂ and BN particles?

Label:chem

Topic
The morphology of composite materials affects their mechanical and radiation shielding properties. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX) are used to analyze the surface and internal structure of these nanocomposites.

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 SEM and TEM analyses of PS-b-PEG copolymers blended with nanostructured SeO₂ and BN particles revealed a granular and rough surface morphology. The SeO₂ nanoparticles were found to be dispersed as small particles on the surface of the copolymers, while BN nanoparticles adhered well to the surface, resulting in a homogeneous distribution. The EDX analysis confirmed the presence of SeO₂ nanoparticles in the composites. As the molecular weight of the macro-crosslinker increased, the polymer particles became more pronounced, and the nanoparticles were more homogeneously dispersed. The study concludes that the morphology of the nanocomposites is suitable for effective gamma-ray shielding due to the uniform distribution of nanoparticles.
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