Preparation and Properties of Eugenol/Modified Polyvinyl Alcohol Antibacterial Composite Films

doi:10.19894/j.issn.1000-0518.220318

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (4): 527-535.DOI: 10.19894/j.issn.1000-0518.220318

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Preparation and Properties of Eugenol/Modified Polyvinyl Alcohol Antibacterial Composite Films

Li-Juan YAN, Tian-He GAO, Dong-Jian SHI, Ming-Qing CHEN()

the Key Laboratory of Synthetic and Biological Colloids，Ministry of Education，School of Chemical and Material Engineering，Jiangnan University，Wuxi 214122，China

Received:2022-09-27 Accepted:2023-02-17 Published:2023-04-01 Online:2023-04-17
Contact: Ming-Qing CHEN
About author:mqchen@jiangnan.edu.cn
Supported by:
the National Natural Science Foundation of China(52103165)

Abstract

Abstract:

Active packaging can prolong the shelf life of food by releasing functional additive. Polyvinyl alcohol （PVA） has attracted extensive interest for its excellent performance. However， there are some problems such as too strong hydrophilicity and low mechanical properties that limit its application in active packaging. Based on the performance requirements of packaging materials， PVA-CC obtained by cross-linking PVA and cellulose nanofiber （CNF） with citric acid （CA）， and eugenol （EUG） as a typical antibacterial agent is loaded in PVA-CC polymer network， and then the composite film PVA-CCE is obtained. It has demonstrated that PVA-CCE shows great mechanical properties， water resistance， thermal stability and antibacterial properties. The swelling ratio of the composite film with CA cross-linking could be reduced from 495.74% to 72.00%， exhibiting excellent water resistance. Compared to the PVA film， the melting temperature of PVA-CCE is reduced by 11 ℃， and the decomposition temperature is increased by 20 ℃， which indicates that the processing performance of PVA is obviously improved after covalent cross-linking. Additionally， there are free CA in the polymer network to play a plasticizing role for improving comprehensive properties. Moreover， free CA could play a synergistic role with EUG to improve antibacterial properties of PVA-CCE. These results suggest that the prepared PVA-CCE film has an extensive application prospect in active packaging.

Key words: Polyvinyl alcohol, Chemical cross-linking, Eugenol, Water resistance, Antibacterial

CLC Number:

O636

Li-Juan YAN, Tian-He GAO, Dong-Jian SHI, Ming-Qing CHEN. Preparation and Properties of Eugenol/Modified Polyvinyl Alcohol Antibacterial Composite Films[J]. Chinese Journal of Applied Chemistry, 2023, 40(4): 527-535.

Figures/Tables 7

Fig.1 Schematic illustration of composite films preparation （A）， photographs （B）， visible light transmittance （C）， FT-IR spectra （D） and XRD patterns （E） of composite films

Fig.2 SEM images of the surface （A-E） and cross-section （F-J） microstructures of PVA （A， F）， PVA-C （B， G）， PVA-CC （C， H）， PVA-CCnc （D， I） and PVA-CCE （E， J）

Fig.3 （A） Photographs of composite films before and after swelling in water，（B） Swelling and mass loss of composite films with different CA contents，（C） free CA content in composite films and （D） water contact angles of composite films with or without water treatmentNote： “*” indicates P＜0.05 in one-way ANOVA， “**” indicates P＜0.01 in one-way ANOVA， “ns” indicates P＞0.05 in one-way ANOVA

Fig.4 Stress-strain curves （A）， tensile strength and elongation at break （B） and modulus （C） of composite filmsNote：“*” indicates P＜0.05 in one-way ANOVA， “**” indicates P＜0.01 in one-way ANOVA， “***” indicates P＜0.001 in one-way ANOVA， “ns” indicates P＞0.05 in one-way ANOVA

Fig.5 TGA （A）， DTG （B） and DSC （C） curves of composite films

Table 1 The loading capacity of composite films on EUG and loading efficiency of EUG

Sample name	Loading capacity/（μg·mg^-1）	Loading efficiency/%
PVA-CC-0.5E	1.67±0.38	37.15±8.49
PVA-CC-1.0E	2.19±0.05	24.29±0.54
PVA-CC-1.5E	2.56±0.62	18.96±4.65
PVA-CC-3.0E	2.77±0.25	10.25±0.94

Fig.6 （A） Photograph of bacterial colony growth；（B） Antibacterial ratio of composite filmsNote： “*” indicates P＜0.05 in one-way ANOVA， “**” indicates P＜0.01 in one-way ANOVA， “***” indicates P＜0.001 in one-way ANOVA， “ns” indicates P＞0.05 in one-way ANOVA

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Preparation and Properties of Eugenol/Modified Polyvinyl Alcohol Antibacterial Composite Films

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