Biomimetic soy protein‐based exterior‐use films with excellent UV‐blocking performance from catechol derivative Acacia mangium tannin

Abstract

Polymer plastic is the main component of current outdoor packaging film materials that are mostly derived from fossil fuels. Its poor ultraviolet (UV) barrier performance and short service life caused by aging degradation result in increased non‐renewable consumption and environmental pollution. The most effective way to solve these problems is the development of a biomass‐based and eco‐friendly packaging with excellent UV‐blocking performance. Herein, inspired by mussels, a facile strategy is reported for the preparation of a biomimetic polymeric material via the incorporation of a biomass‐derived catechol derivative Acacia mangium tannin (AMT) into a biodegradable soy protein isolate (SPI) matrix. The morphologies, mechanical, thermal properties, and UV‐blocking abilities and mechanisms of the modified films were evaluated. With the increase of the AMT content, the stress of the composite film was found to gradually increase, and the modified SPI composite film exhibited a powerful tensile strength of 7.64 MPa and a high breaking strain of 145.6%. After the introduction of AMT, the films exhibited excellent UV‐blocking performance. As both SPI and AMT are biodegradable, this work presents an innovative design strategy for fully‐biodegradable and robust polymeric materials with excellent UV‐blocking performance that have promising potential applications in packaging.

Wear‐ and UV‐resistant polycarbonate‐based composite films reinforced by a novel inorganic–organic hybrid filler

“…As the AMT dosage increased, the resultant film product exhibited enhanced tensile strength, elongation at break, and UV-blocking performance. 25 These studies all revealed evident benefits of catechol-functionalized fillers for performance improvements of composites, especially in mechanical properties and UV shielding.…”

“…31 Respect to CFNS, the absorption band at 3340 cm À1 belongs to the N-H stretching vibration from amide groups in CFNS. 25,32 A reinforced signal around 1626 cm À1 is primarily contributed by the C=O stretching vibration from amide groups. 33 The increased number of methylene groups originating from DOPAC also leads to the reinforcement of C-H stretching vibration (2929 and 2850 cm À1 ).These signals together with the benzene skeleton vibration (around 1574 cm À1 ) 34 all refer to the successful amidation between ANS and DOPAC.…”