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Author: search.filters.author.Prachayawarakorn, JutaratSubject: search.filters.subject.Biopolymer

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    Effect of different crosslinking agents on properties of dual modified starch biodegradable films prepared by crosslinked-oxidized method
    (2020-01-01)
    Tanetrungroj, Yossathorn
    ;
    Prachayawarakorn, Jutarat
    Dual modified starch films were prepared by using crosslinked-oxidized starch via hydrogen peroxide and different crosslinking agents, including borax and a mixture of sodium trimetaphosphate/ sodium tripolyphosphate. The effect of different crosslinking agents on the properties of dual modified films was examined and compared to single modified starch films. The crosslinked and oxidation reactions were confirmed by diminished intensity peaks of hydrogen bonding and new IR peaks of carbonyl and carboxyl groups. Tensile strength and hydrophobicity of native starch film, and elongation of crosslinked starch films were improved by crosslinked-oxidized method, especially for crosslinked starch film with borax.
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    Characterization and properties of biodegradable thermoplastic grafted starch films by different contents of methacrylic acid
    (2019-02-15)
    Weerapoprasit, Chayapa
    ;
    Prachayawarakorn, Jutarat
    Due to poor mechanical and thermal properties of native starch (NS) film; in the present work; NS was modified by graft copolymerization. Thermoplastic starch (TPS) grafted by methacrylic acid (MAA) with different percentage of grafting, i.e., 0%, 18.3%, 36.3%, 52.1% and 89.7% were prepared and tested. The result demonstrated that the intensity of IR peak of acrylic group increased with the increasing percentage of grafting. The higher graft copolymerization with MAA also significantly reduced degree of crystallinity. The strain at maximum load of TPS film grafted by MAA increased with the increasing percentage of grafting. However, water uptake of TPS film grafted by MAA reduced with high percentage of grafting (52.1% and 89.7%). In addition, different TPS films grafted by MAA were also examined for morphology, water vapor permeability, thermal property and biodegradable property by soil buried test.