Characterizations of biodegradable epoxy-coated cellulose nanofibrils (CNF) thin film for flexible microwave applications

Abstract

Wood pulp cellulose nanofibrils (CNF) thin film is a novel recyclable and biodegradable material. We investigated the microwave dielectric properties of the epoxy coated-CNF thin film for potential broad applications in flexible high speed electronics. The characterizations of dielectric properties were carried out in a frequency range of 1-10 GHz. The dielectric constant and loss tangent were extracted by using measurements of microstrip transmission lines that were built on the epoxy coated-CNF film and combined with Agilent Advanced Design System simulations. The RF property for the epoxy coated-CNF was compared to that of commercial polyethylene terephthalate film (PET). With the comparable microwave properties of non-biodegradable PET film, our study suggests that the epoxy coated-CNF film is a suitable biodegradable and environment-friendly substrate for flexible microwave and other applications.

Physical and tensile properties of epoxy laminated magnetic bacterial cellulose nanocomposite films

“…In this study, a commercial grade of epoxy laminating resin was used for coating and modifying water absorption, thickness swelling and tensile properties of magnetic bacterial cellulose (MBC) nanocomposite films. Literature shows the use of epoxy resin to improve the physical and mechanical characteristics of cellulose substrates …”

“…To enhance the microwave dielectric characteristics of the NFC thin films, Mi et al . coated them with epoxy resin . In addition to appropriate transparency and flexibility, the coated films showed good microwave dielectric properties which were competitive with conventional ones.…”

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“…Up to this point, no dielectric losses have been considered in the simulations. Assuming realistic values of the loss tangent in foam (tan δ < 0.001) and PET (tan δ = 0.017), 35 a further simulation in CST revealed that the efficiency drop caused by the losses in the dielectric is less than 2%. This could be attributed to the reduced losses in foam and the thin PET film utilized.…”

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“…They reported the dielectric constant of 2.6 for epoxy-coated-CNF and dielectric loss values in the range 0.03-0.042. However, the epoxy coated-CNF has proven to be more suitable for flexible microwave applications than for PET films [92]. Zhang, et al reported that the coating of photoresist SU-8 on a silicon-(100) wafer substantially improves the flexibility and can be used for high-performance flexible electronics [93], whereas developed glass/SU8-gold electrodes by Matarèse, et al were extremely transparent, and stable in the biological culture medium, which exhibited biocompatibility similar to glass [94].…”