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Manoj Kumar Pal
Manoj Kumar Pal
Department of Chemistry, Dr. B. R. Ambedkar University, Agra 282002, India
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Beena Singh
Beena Singh
Department of Chemistry, Dr. B. R. Ambedkar University, Agra 282002, India
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Jaiswar Gautam
Jaiswar Gautam
Department of Chemistry, Dr. B. R. Ambedkar University, Agra 282002, India
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Abstract
The influences of nanosized CaCO3 on the thermal and optical properties embedded in poly(methyl methacrylate) (PMMA) and polystyrene (PS) were investigated. Calcium carbonate nanoparticles were synthesized by in situ deposition technique, and its nano size (32–35 nm) was confirmed by scanning electron microscope (SEM) and X-ray studies. Nanocomposites samples of PMMA/CaCO3 and PS/CaCO3 were prepared with different filler loading (0–4 wt%) of CaCO3 nanoparticles by solution mixing technique. The Fourier transform infrared analysis confirmed that CaCO3 nanoparticles were present in the polymers matrices. The morphology and elemental composition of nanocomposites were evaluated by SEM and energy dispersive X-ray spectroscopy. The thermal properties of nanocomposites were characterized by differential scanning calorimetric, thermogravimetric, and differential thermogravimetry analysis, and the results indicate that the incorporation of CaCO3 nanoparticles could significantly improve the thermal properties of PMMA/CaCO3 and PS/CaCO3 nanocomposites. The glass transition temperature (Tg) and decomposition temperature (Td) of nanocomposites with 4 wt% of CaCO3 nanoparticles were increased by 30 and 24 K in case of PMMA/CaCO3 and 32 and 15 K in the case of PS/CaCO3 nanocomposites, respectively. The obtained transparent nanocomposites films were characterized using UV–Vis spectrophotometer which shows the transparencies of nanocomposites are almost maintained in visible region while the intensity of absorption band in ultraviolet (UV) region is increased with CaCO3 nanoparticles contents and these composites particles could enhance the UV-shielding properties of polymers.
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