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  • Open Access

    ARTICLE

    Synthesis of poly(ω-pentadecalactone) using Lipase Immobilized onto a Renewable Carrier, Rice husk ash and their Characterization

    CANSU ULKER TURAN1,*, YUKSEL GUVENILIR1

    Journal of Polymer Materials, Vol.38, No.3-4, pp. 271-280, 2021, DOI:10.32381/JPM.2021.38.3-4.8

    Abstract Rice husk ash is a side-product of rice production; thus, it is a cheap, abundant, and renewable material, and utilized as an enzyme carrier to immobilize Candida antarctica lipase B. In this study, Candida antarctica lipase B immobilized onto rice husk ashes was used to catalyze ring opening polymerization of 16-membered lactone, ω-pentadecalactone. In order to determine the best polymerization conditions for highest molar mass polymer, reactions were proceeded at various temperatures and time periods. The best reaction conditions were obtained as 80°C and 6 hours (Mn = 34255 g mol-1). Molecular structure of this polymer More >

  • Open Access

    ARTICLE

    Performance Comparison of Commercial and Home-Made Lipases for Synthesis of Poly(δ-Valerolactone) Homopolymers

    Cansu Ulker*, Zeynep Gok, Yuksel Guvenilir

    Journal of Renewable Materials, Vol.7, No.4, pp. 335-343, 2019, DOI:10.32604/jrm.2019.03819

    Abstract Novozyme 435, which is the commercially available immobilized form of Candida antarctica lipase B, has been successfully conducted ring opening polymerization of lactones in organic solvents. In this paper, it was aimed to introduce an alternative biocatalyst for Novozyme 435. Candida antarctica lipase B immobilized onto rice husk ashes via physical adsorption (with a specific activity of 4.4 U/mg) was prepared in previous studies and used as a biocatalyst for poly(δ-valerolactone) synthesis in the present work. Polymerization reactions were proceeded at various reaction temperatures and periods via both two immobilized enzyme preparations. The resulting products More >

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