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    The enhancement of polymer composite coating by using a waste glass powder as alternative reinforcement
    (2022-01-01)
    Buaphuen, Phummiphat
    ;
    Makcharoen, Worawut
    ;
    Vittayakorn, Wanwilai
    Epoxy-based composites are widely used as a surface coating in the aircraft, automobile and microelectronic industries due to theirs great mechanical properties, excellent strength-to-weight ratio, lightweight, and good machinability. However, the epoxy-based coating has poor corrosion resistance in a severe environment such as in seawater. The incorporation of various fillers into epoxy resins can yield high-performance composites having high strength, lightweight, multifunctional properties and also improve corrosion resistance. Therefore, this study focuses on the preparation of inorganic nanoparticles filled in an epoxy resin matrix to create high-performance composites. The waste glass powder (WGP) was selected to use as the alternative reinforcement in epoxy resin-based composites in order to search for a sustainable and recycling filler along with the use of commercial SiO<inf>2</inf> as a comparative filler. The broken glass from household waste was processed through a high-speed vibratory milling technique until reaching the micrometer level. The physical properties, microstructure, mechanical properties, electrical properties, water absorption and corrosion resistance of all composites are investigated. The results show that after mixing WGP with an epoxy resin matrix, both Vickers hardness and abrasion resistance significantly increase compared to the neat epoxy resin whereas the water absorption ability of composites decreases. For the electrical properties, WGP does not show a significant effect on dielectric constant, dielectric loss and resistivity whereas the anticorrosive performances of the WGP/epoxy resin composite coating are improved.
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    Edible coating of chitosan ionically combined with κ-carrageenan maintains the bract and postharvest attributes of dragon fruit (Hylocereus undatus)
    (2021-08-01)
    H., Nguyen T.
    ;
    P., Boonyaritthongchai
    ;
    M., Buanong
    ;
    S., Supapvanich
    ;
    C., Wongs Aree
    Dragon fruit (Hylocereus undatus) has medicinal properties due to its rich antioxidant profile. Dragon fruit also has an attractive appearance of red peel and green bracts. However, shrivelling and weight loss, bract yellowing, and postharvest diseases are major challenges to the dragon fruit trade. The objective of the present work was, therefore, to formulate a coating composed of chitosan and κ-carrageenan for dragon fruits during storage at 10°C. The composite coating based on 1% chitosan (w/v) and 0.2% (w/v) κ-carrageenan with 0.75% (w/v) glycerol as a plasticiser effectively reduced the physiological weight loss and maintained the freshness of the dragon fruits, while increasing the phenolic content and maintaining the titratable acidity in the pulp. The composite coating delayed chlorophyll degradation by suppressing chlorophyllase and chlorophyll-degrading peroxidase, thereby maintaining the chlorophyll content (45.46 mg/100 g dry weight) and freshness of the bracts. However, the composite coating did not possess a strong effect on enhancing chitinase and β-1-3 glucanase activities of dragon fruits during storage and controlling disease symptoms.
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    Postharvest Hot Water Treatment Followed by Chitosan- and κ-Carrageenan-Based Composite Coating Induces the Disease Resistance and Preserves the Quality in Dragon Fruit (Hylocereus undatus)
    (2020-01-01)
    Nguyen, Hanh Thi
    ;
    Boonyaritthongchai, Panida
    ;
    Buanong, Mantana
    ;
    Supapvanich, Suriyan
    ;
    Wongs-Aree, Chalermchai
    Abstract: Postharvest diseases and loss of freshness are major problems that cause the deterioration of dragon fruit. The present study determined the effect of hot water treatment (HWT) at 50°C for 5 min followed by 1.0% chitosan and 0.2% κ-carrageenan-based composite coating to counter the issues. The results showed that HWT followed by the composite coating-enhanced antioxidant enzyme activities and reduced accumulation of H<inf>2</inf>O<inf>2</inf> in the peel, which demonstrated the defensive response in the tissues leading to reduce disease development. The chitinase and β-1,3-glucanase did not show a significant effect in reducing the postharvest diseases of dragon fruit. While the HWT helped to increase phenolics content and antioxidant capacity in the pulp, the composite coating was crucial to maintain green color of the bract. Therefore, we concluded that HWT combined with composite coating controlled the diseases via antioxidant defensive response and maintained the overall quality of dragon fruit for 30 days of storage at 10°C.