FTIR Analysis of Ethyl Cellulose (EC) and Polyvinyl Chloride (PVC) Polyblends Thin Films Doped With Salicylic Acid
Unhale S B
Department of Physics, Dr. Manorama & Prof Haribhau Shankar Rao Pundkar Arts, Commerce and Science College, Balapur, Dist. Akola, M.S. 444302
93-101
Vol: 15, Issue: 4, 2025
Receiving Date:
2025-10-01
Acceptance Date:
2025-10-28
Publication Date:
2025-10-29
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http://doi.org/10.37648/ijrst.v15i04.007
Abstract
This study examines the structural features and molecular interactions in thin films of Ethyl Cellulose (EC) and Polyvinyl Chloride (PVC) polyblends doped with salicylic acid (SA), prepared in a 1:1 (EC:PVC) ratio via isothermal evaporation. FTIR spectroscopy characterized pure and SA-doped films at varying dopant concentrations.
The undoped polyblend spectra showed characteristic bands of EC (C–O–C stretching at 1100–1000 cm?¹, C–H vibrations) and PVC (C–Cl stretching at 600–700 cm?¹, C–H deformations).
Doping with SA introduced new peaks confirming its incorporation, including aromatic C=C (~1600–1450 cm?¹), broad O–H stretching (~3200–3400 cm?¹), and C=O (~1680–1650 cm?¹). Increasing SA concentration caused peak shifts (often to higher wavenumbers) and intensity changes, indicating intermolecular interactions like hydrogen bonding between SA's hydroxyl/carboxyl groups and EC's oxygen moieties or PVC's chlorine atoms.
These observations suggest improved miscibility, possible charge-transfer complexes, and good dopant-matrix compatibility. The FTIR findings reveal key chemical environments and interaction mechanisms in SA-doped EC-PVC polyblend films, with potential applications in controlled-release systems, optical coatings, and functional polymers.
Keywords:
Ethyl Cellulose; Polyvinyl Chloride; Polyblends; Salicylic Acid; FTIR; Thin films; Molecular interactions
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