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Title: Chemically room temperature crosslinked polyvinyl alcohol (PVA) with anomalous microwave absorption characteristics
Authors: Bora, Pritom J.
Anil, Amith G.
Ramamurthy, Praveen C.
Lee, Yee Hui
Keywords: Engineering::Materials
Issue Date: 2021
Source: Bora, P. J., Anil, A. G., Ramamurthy, P. C. & Lee, Y. H. (2021). Chemically room temperature crosslinked polyvinyl alcohol (PVA) with anomalous microwave absorption characteristics. Macromolecular Rapid Communications, 42(10), 2000763-.
Journal: Macromolecular Rapid Communications 
Abstract: Polyvinyl alcohol (PVA) is a great interest polymer due to its excellent film-forming, emulsifying, microwave dielectrics and adhesive properties. However, PVA is a water-soluble synthetic polymer making it susceptible to environmental factors. In this work, PVA is crosslinked at room temperature using divinyl sulfone (DVS) as a crosslinker, and the obtained crosslinked PVA (XPVA) is water-insoluble. Crosslinking mechanism is proposed, thermal and microwave dielectric properties of X-PVA are studied. The studies revealed that X-PVA has better thermal stability and microwave absorption properties. The obtained minimum reflection loss (RL) of X-PVA is -23 dB (filler-free) with entire X-band (8.2-12.4 GHz) absorption bandwidth (RL ≤ -10 dB), indicating excellent microwave absorption properties. Artificial neural network (ANN) predicted RL of X-PVA also matched well with the experimental data. Electromagnetic power simulation suggests that the microwave power absorption density due to the dielectric loss is intrinsically predominant in X-PVA compared to the pristine PVA. Further, the ratio of electromagnetic energy to heat energy conversion power (absorption) of X-PVA is much higher than pristine PVA, indicating the suitability for self-powered devices. X-PVA also fulfils many commercial requirements such as bulk level facile synthesis, large area fabrications, ultralight, and inexpensive.
ISSN: 1022-1336
DOI: 10.1002/marc.202000763
Schools: School of Electrical and Electronic Engineering 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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