Fully Green Poly(vinyl alcohol)/Tea Polyphenol Composites and Super Anti‐Ultraviolet and ‐Bacterial Properties

Abstract

Several fully green composites are prepared by taking the tea polyphenols (TP) with various percentages to blend with poly(vinyl alcohol) (PVA). The as‐prepared PVA/TP composite with only 5% TP shows superb anti‐UV properties even after water washing, the presented UV protection factor (UPF) value is still greater than that of the standard values reported by Australia and New Zealand (AS/NZS 4399‐1996). Moreover, the UPF value of those PVA/TP composites is found capable of furthermore enhancement by increasing the TP percent. This PVA/TP composite also shows good antibacterial and biodegradability while it is kept with certain mechanical properties to fit required application cases.

Assisted Compatibility, and Balanced Regulation of the Mechanical, Thermal, and Antioxidant Activity of Polyvinyl Alcohol-Chinese Bayberry Tannin Extract Films Using Different Di-Aldehydes as Cross-Linkers

“…In addition, the intermolecular interaction of PT film mainly depends on the intermolecular hydrogen bonding interaction with an interpenetrated network, an outer force easily results in sliding of polymer chains. Similar results can be found in PVA/gallic acid film [21] and PVA/tea polyphenol film [18]. The tensile strength values of PVA/BT films cross-linked by glyoxal, glutaraldehyde and dialdehyde starch significantly increased from 22.1 MPa to 42.2 MPa, 37.4 MPa and 29.4 MPa, respectively, compared with that of uncross-linked PVA/BT film.…”

“…In recent years, phenolic compounds are gaining great attentions as active compounds to develop PVAbased active packaging films in consideration of their excellent antioxidant, anti-ultraviolet (UV), antifungal and antimicrobial capacity [15]. For instance, tea extract [7,[16][17][18][19], tomato by-products extract [20], quercetin [21], tannin acid [22] and larch bark tannins [23,24] have been conducted to be incorporated with PVA for developing active films bearing antioxidant and antimicrobial functions. Among these phenolic compounds, tannins are water-soluble phenolic compounds with molecular weights between 500 and 3000 g/mol.…”

“…However, deterioration of mechanical performance and alteration of morphology were generally found with increase of the phenolic compounds, mainly because of the imperfect miscibility. Examples of such effects, PVA compounded with more than 10% of tea polyphenol [18] or incorporated with more than 5% of gallic acid [21].…”

Development of Antioxidant Packaging Film Based on Chinese Bayberry Tannin Extract and Polyvinyl Alcohol

“…It should be noted that the fractured surface of P20T also presented some dots and pores probably caused by the agglomeration of BT during the solvent casting process, producing discontinuing film structure. This result was also observed in PVA incorporated with high concentration of tea polyphenol [33].…”

Research progress of polyphenols in nanoformulations for antibacterial application

“…The polymers fabricating nanofibers include natural polymers (such as CS, collagen, zein, gelatin, silk fibroin, and cellulose) and synthetic polymers. Among the synthetic polymers, PLGA, PLA, PGA, PCL, and PVA are commonly used to improve the mechanical properties and degradation kinetics due to their biocompatible and biodegradable characteristics [ [169] , [170] , [171] ]. For example, Zhang et al prepared nanofibers with antibacterial and ultraviolet protection application potential based PVA and tea polyphenol [ 172 ].…”