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    National Tsing Hua University Institutional Repository > 原子科學院  > 生醫工程與環境科學系 > 期刊論文 >  FTIR-ATR measurements of the ionization extent of acrylic acid within copolymerized methacrylated dextran/acrylic acid networks and its relation with pH/salt concentration-induced equilibrium swelling


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/40626


    Title: FTIR-ATR measurements of the ionization extent of acrylic acid within copolymerized methacrylated dextran/acrylic acid networks and its relation with pH/salt concentration-induced equilibrium swelling
    Authors: Chiu HC;Hsiue T;Chen WY
    教師: 邱信程
    Date: 2004
    Publisher: 0032-3861
    Keywords: dorman equilibrium theory
    counterion condensation
    DRUGS
    BEHAVIOR
    GELS
    SALT
    PH
    MODEL PROTEIN
    ENZYMATIC DEGRADATION
    CONTROLLED-RELEASE
    GLYCIDYL METHACRYLATE
    SENSITIVE DEXTRAN HYDROGELS
    dextran hydrogels
    Abstract: ©2004 Elsevier - In this study, dextran hydrogels were obtained by free radical copolymerization of methacrylated dextran with acrylic acid (AAc) in aqueous solution. The fractions of dissociation of AAc units within hydrogel in response to changes in pH and ionic strength of external aqueous solution were determined by FTIR-ATR spectroscopy. The influence of small ion concentration within hydrogel on the dissociation constant of AAc follows the Debye-Huckel behavior. Based on the results from the FTIR-ATR measurements, the total ion concentration difference inside and outside the hydrogel was determined according to the Donnan equilibrium theory, taking account of the counterion condensation effect quantitatively. The swelling response of hydrogels to changes in external pH and ionic strength was governed mainly by the ionic osmotic pressure due to the accumulation of diffusible ions within hydrogels. The energy balance between the osmotic and elastic retractile responses indicates the non-Gaussian behavior of elastically effective subchains with increasing swelling.
    URI: http://www.elsevier.com/
    Elsevier
    http://nthur.lib.nthu.edu.tw/handle/987654321/40626
    Appears in Collections:[生醫工程與環境科學系] 期刊論文

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