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Chemically Room Temperature Crosslinked Polyvinyl Alcohol (PVA) with Anomalous Microwave Absorption Characteristics
Author(s) -
Bora Pritom J.,
Anil Amith G.,
Ramamurthy Praveen C.,
Lee Yee Hui
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000763
Subject(s) - polyvinyl alcohol , materials science , microwave , reflection loss , dielectric loss , thermal stability , polymer , dielectric , vinyl alcohol , absorption (acoustics) , composite material , chemical engineering , polymer chemistry , composite number , optoelectronics , physics , quantum mechanics , engineering
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.