Journal
POLYMERS
Volume 15, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/polym15193977
Keywords
LDPE; oyster shell; tensile property; thermostability; blend film; antibacterial; barrier
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This research focuses on developing a LDPE/TOS blend by incorporating thermally treated oyster shell powder (TOS) into low-density polyethylene (LDPE) to enhance food packaging materials. The blend exhibits advantageous characteristics in terms of mechanical strength, thermostability, water absorption, hydrophobicity, as well as improved barrier properties against water vapor transmission and antibacterial properties.
This research delves into the impact of incorporating thermally treated oyster shell powder (TOS), a biowaste filler, into low-density polyethylene (LDPE) to develop a LDPE/TOS blend, aiming at enhancing food packaging materials. The LDPE/TOS blend portrays advantageous characteristics such as augmented mechanical strength, thermostability, crystallinity, water absorption, and improved hydrophobicity with TOS content up to 50%. Microstructure analysis reveals a transition from a sparse to a more interconnected structure, contributing to the amplified tensile strength. The blend demonstrates increased barrier properties against water vapor transmission, which is attributed to elongated diffusion paths induced by the TOS particles. Application of the blend material in vegetable preservation trials manifested a substantial reduction in water loss compared to pure LDPE or no packaging. This biowaste-based blend film extends the shelf-life of chicken significantly when compared to that of pure LDPE. Importantly, the LDPE/TOS blend exhibits excellent antibacterial properties against both Escherichia coli and Staphylococcus aureus.
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