Dielectric properties and thermal destruction of poly(dimethylsiloxane)/Fe2O3/SiO2 nanocomposites

• Published in: Applied surface science Vol. 305; pp. 67 - 76
• Main Authors: Galaburda, M.V., Klonos, P., Gun’ko, V.M., Bogatyrov, V.M., Borysenko, M.V., Pissis, P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.06.2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Dielectric relaxation spectroscopy; Differential scanning calorimetry; Exact sciences and technology; Fe2O3/SiO2 nanocomposite; Hydrophobicity; Nanosilica; Physics; Poly(dimethilsiloxane); SiО2/PDMS; Thermally stimulated depolarization current; Thermogravimetry; Differential scanning calorimetry; Dielectric relaxation spectroscopy; Poly(dimethilsiloxane); Fe2O3/SiO2 nanocomposite; Thermally stimulated depolarization current; Thermogravimetry; Hydrophobicity; Nanosilica; SiО2/PDMS; Poly( dimethilsiloxane); Inorganic compounds; Iron oxide; Thermostimulated conduction; Transition element compounds; Dielectric relaxation; O; Thermostimulated depolarization; Composite materials; Nanocomposites; Silicon oxides; SiO; nanocomposite; Nanostructured materials; Fe; PDMS
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2014.02.162

Thermally stimulated chemical transformation of poly(dimethilsiloxane) (PDMS) adsorbed onto highly disperse Fe2O3/SiO2 was studied using FTIR, thermogravimetry and differential thermal analysis. The influence of active surface sites on this transformation was investigated since iron oxide affects the degradation of PDMS. It was shown that PDMS provides stable (in the 100–500°C range) hydrophobic properties to SiО2/PDMS depending on PDMS concentration. Differential scanning calorimetry, thermally stimulated depolarization currents and dielectric relaxation spectroscopy techniques were employed to investigate the effects of iron oxide on thermal transitions (in particular glass transition), segmental dynamics and interfacial interactions in PDMS/oxides nanocomposites.