Dissipative Processes in a Polyvinyl Alcohol–Silver Nanocomposite System

• Published in: Russian Journal of Physical Chemistry A Vol. 98; no. 8; pp. 1877 - 1882
• Main Authors: Lomovskoy, V. A., Abaturova, N. A., Lomovskaya, N. Yu, Galushko, T. B., Khlebnikova, O. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.08.2024; Springer Nature B.V
• Subjects: All-Russian Conference “Surface Phenomena in Dispersed Systems”; Aqueous solutions; Chemistry; Chemistry and Materials Science; Dissipation; Glass transition temperature; Luminous intensity; Nanocomposites; Physical Chemistry; Polyvinyl alcohol; Shear modulus; Silver nitrate; Ultraviolet radiation; nanoparticles; polyvinyl alcohol; composite; dissipative process
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024424700961

Films are prepared from an aqueous solution of polyvinyl alcohol (PVA) and silver nitrate AgNO 3 under ultraviolet irradiation (UV). The effect the filler has on their physicochemical and relaxation properties is studied via relaxation spectrometry. The resulting spectra are characterized by two local temperature peaks of dissipative losses, regardless of the state of silver in the PVA structure. With PVA–Ag + chelates, the intensity of the peak responsible for vibrations of OH-groups falls and is partially restored after irradiating samples with UV light. Shear modulus G ( T ) for the original PVA matrix is higher than the one for the filled system (PVA–AgNO 3 ). The temperature of the glass transition in the region where the α peak appears is reduced in filled systems.