Preparation and antimicrobial properties of LDPE composite films melt-blended with polymerized urushiol powders (YPUOH) for packaging applications |
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| Affiliation: | 1. Centre for Bio-Polymer Science and Technology (CBPST), FACT Township, Eloor, Udyogamandal P.O., Cochin 683501, India;2. Quality Assurance and Management Division, Central Institute of Fisheries Technology, Cochin 682029, Kerala, India;3. Fish Processing Division, Central Institute of Fisheries Technology, Cochin 682029, Kerala, India;1. College of Materials Science and Engineering, Fujian Normal University, Fuzhou 350007, China;2. Fujian Key Laboratory of Polymer Materials, Fuzhou 350007, China;1. College of Material Science and Engineering, Fujian Normal University, Fuzhou 350007, China;2. Fujian Key Laboratory of Polymer Materials, Fuzhou 350007, China;1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;2. Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan 430068, China;3. Changzhou Liu Guojun Vocational Technology College, Changzhou 213025, Jiangsu, China;1. Food Packaging Group, School of Food & Nutritional Sciences, University College Cork, Cork, Ireland;2. Department of Chemistry, University College Cork, Cork, Ireland;3. UCD School of Biosystems Engineering, Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland;4. Department of Food Science, School of Food Science and Technology, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia;1. College of Chemistry and Material Science, Fujian Normal University, Fuzhou 350007, China;2. Fujian Key Laboratory of Polymer Materials, Fuzhou 350007, China;3. Quangang Research Institute of Petrochemical Technology, Fujian Normal University, Quanzhou 362807, China;4. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China |
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| Abstract: | Polymerized solid-type urushiol (YPUOH) with high thermal stability and excellent antimicrobial properties was prepared and incorporated into low-density polyethylene (LDPE) via melt-compounding and subsequent melt-extrusion processes. To investigate the feasibility of as-prepared LDPE/YPUOH composite films for use in packaging applications, the films were characterized as a function of YPUOH using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (WAXD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), contact angle, and antimicrobial activity assays. The physical properties and antimicrobial activities were found to be strongly dependent upon the changes in chemical and morphological structures originating from different compositions of the composite films. The thermal stability of the composite films was effectively improved with YPUOH addition. Incorporating YPUOH caused the water vapor transmission rate (WVTR) to decrease from 10.3 to 6.5 g/m2·day, suggesting that the barrier properties of LDPE, which are relatively good per se, were further improved. Furthermore, the LDPE/YPUOH composite films exhibited good antimicrobial activities against both Gram-negative and Gram-positive micro-organisms. However, the dispersion of YPUOH in the LDPE matrix was not satisfactory due to a weak interaction between LDPE and YPUOH, which may adversely affect the thermal and barrier properties at higher contents of YPUOH. Further studies are required to increase the compatibility and dispersion of YPUOH in the LDPE matrix in order to optimize its performance and expand its applications. |
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| Keywords: | Polyurushiol Melt-extrusion Antimicrobial activity Thermal stability Moisture barrier property Active packaging |
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