한빛사 논문
Taehyung Kim†⊥ , Thang Hong Tran‡§⊥ , Sung Yeon Hwang‡§ , Jeyoung Park‡§ , Dongyeop X. Oh*‡§ , and Byeong-Su Kim*∥
† Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
‡ Research Center for Bio-Based Chemistry, Korea Research Institute of Chemical Technology (KRICT), Ulsan 44429, Republic of Korea
§ Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon 34113, Republic of Korea
∥ Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
*Corresponding Authors
Author Contributions
⊥These authors contributed equally.
Abstract
Plastic packaging effectively protects foods from mechanical, microbial, and chemical damage, but oxygen can still permeate these plastics, degrading foods. Improving the gas barrier usually requires metallic or halogenated polymeric coatings; however, both cause environmental concerns and metallic coatings block visible light and electromagnetic signals. This paper reports a design of a highly flexible, visible light and radio frequency transparent coating on commercial poly(ethylene terephthalate) (PET) film. Nanoscale blending was achieved between negatively charged cellulose nanofibers and positively charged chitin nanowhiskers by employing spray-assisted layer-by-layer assembly. Synergetic interplay between these highly crystalline nanomaterials results in a flexible film with superior barrier characteristics. The oxygen transmission rate was below 0.5 mL m–2 day–1. Moreover, this coating maintains its performance even when exposed to common hazards such as bending stress and hydration. The coating also notably reduces the haziness of PET with a negligible loss of transparency and provides effective inhibition of antibacterial growth. This “crab-on-a-tree” nanocoating holds high potential for biorenewable and optical and radio frequency transparent packaging applications.
Keywords: biomass; food packaging; high-performance coating; layer-by-layer assembly; nanomaterial
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