FTIR assessment of poly(ethylene oxide) irradiated in solid state,melt and aqeuous solution |
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| Authors: | Irina Pucić Tanja Jurkin |
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| Affiliation: | 1. Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark;2. Center for Biopharmaceuticals and Biobarriers in Drug Delivery, Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark;3. Nano-BioScience Research Group, DTU-Food, Technical University of Denmark, Kemitorvet, B202, 2800 Kgs., Lyngby, Denmark;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450000, PR China;2. Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;1. Department of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova (PD), Italy;2. Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, INSTM, Italy;3. Veneto Nanotech S.C.p.a., Via San Crispino 106, I-35129 Padova (PD), Italy;4. Solid State NMR/EPR Laboratory, Department of Physics and Astronomy, Hunter College of CUNY, New York, NY 10065, United States;1. The NANOSMAT Society, One Central Park, Northampton Road, Manchester M40 5BP, United Kingdom;2. The University of Texas Rio Grande Valley, Department of Mechanical Engineering, Edinburg, TX 78539, USA;3. The University of Texas Rio Grande Valley, Department of Physics, Edinburg, TX 78539, USA;1. GITAM University, Dept. of Engineering Physics, GIT, Visakhapatnam-530 045, A.P, India;2. Sri Venkateswara University, Department of Physics, Tirupati-517 502, India |
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| Abstract: | FTIR spectroscopy was used to study poly(ethylene oxide), PEO, irradiated in solid and molten aggregate states and as aqueous solutions of various concentrations. The changes in shape and width of –C–O–C– complex absorption intensities at around 1112 cm?1 were the most prominent. On irradiation of solid samples in contact with air shrinking of –C–O–C– complex and increase in its absorption intensities indicated predominant degradation. Crosslinking prevailed on irradiation of molten PEO and of its aqueous solutions in nitrogen atmosphere and manifested itself as widening of –C–O–C– absorption and decrease of corresponding intensities. Partial or complete merging of CH2 wagging vibrations at 1342 cm?1 and 1360 cm?1 that are characteristic of crystalline PEO into a single absorption at around 1350 cm?1 indicated amorphization what was observed for samples that had reduced degree of crystallinity determined by differential scanning calorimetry. DSC could not discriminate between degradation and crosslinking while the changes in width and shape of –C–O–C– complex were independent of the changes in crystallinity. Comparison of FTIR spectra of the same PEO samples obtained as thin film and as KBr pellets revealed that pellet preparation results in a number of spectral artefacts. |
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