Combination of internal and external plasticization of hydroxypropylated birch xylan tailors the properties of sustainable barrier films

Kirsi S. Mikkonen, Christiane Laine, Inkeri Kontro, Riku A. Talja, Ritva Serimaa, Maija Tenkanen

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)

    Abstract

    To develop functional and sustainable products from future wood biorefineries, birch kraft pulp xylan was alkali-extracted and modified in aqueous solvent with hydroxypropylation to enhance its processability to films. For the first time, the roles of internal vs. external plasticization in the mechanical, thermal, and barrier performance of xylan films were systematically evaluated as a function of the degree of substitution (DS) of hydroxypropyl (HP) groups (internal plasticizer) and the added sorbitol (external plasticizer). In addition, the moisture uptake and the degree of crystallinity of hydroxypropyl xylan (HPX) films were characterized. Internal plasticization of xylan with HP groups enabled cohesive film formation, but did not form barrier materials alone. The addition of sorbitol as external plasticizer was necessary to obtain gas barrier films. The combinations of internal and external plasticization at selected ratios enabled the tailoring of film properties. Low to medium DS of HP and the addition of 10% or 20% sorbitol resulted in promising barrier properties. The tensile strength of the HPX films was rather high between 27 and 43 MPa, depending on the level and type of plasticization. The thermal stability of HPXs increased and the degree of crystallinity of xylan in the films decreased as the internal plasticization increased. The glass transition temperature of HPXs and HPX films decreased more with external than with internal plasticization. The studied concept would benefit the sustainable exploitation of natural resources. The promising material properties, high degree of biobased raw materials, and non-food origin make HPX-based films an interesting option for multilayer paperboard coating for food packaging, for example.
    Original languageEnglish
    Pages (from-to)307-318
    JournalEuropean Polymer Journal
    Volume66
    Issue numberMay
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Xylans
    Plasticizers
    plasticizers
    Sorbitol
    crystallinity
    Substitution reactions
    substitutes
    Coating techniques
    Kraft pulp
    Alkalies
    Natural resources
    exploitation
    food
    packaging
    moisture
    tensile strength
    glass transition temperature
    alkalies
    Materials properties
    resources

    Keywords

    • barrier properties
    • films
    • hydroxypropyl xylan
    • materials
    • polysaccharides

    Cite this

    Mikkonen, Kirsi S. ; Laine, Christiane ; Kontro, Inkeri ; Talja, Riku A. ; Serimaa, Ritva ; Tenkanen, Maija. / Combination of internal and external plasticization of hydroxypropylated birch xylan tailors the properties of sustainable barrier films. In: European Polymer Journal. 2015 ; Vol. 66, No. May. pp. 307-318.
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    abstract = "To develop functional and sustainable products from future wood biorefineries, birch kraft pulp xylan was alkali-extracted and modified in aqueous solvent with hydroxypropylation to enhance its processability to films. For the first time, the roles of internal vs. external plasticization in the mechanical, thermal, and barrier performance of xylan films were systematically evaluated as a function of the degree of substitution (DS) of hydroxypropyl (HP) groups (internal plasticizer) and the added sorbitol (external plasticizer). In addition, the moisture uptake and the degree of crystallinity of hydroxypropyl xylan (HPX) films were characterized. Internal plasticization of xylan with HP groups enabled cohesive film formation, but did not form barrier materials alone. The addition of sorbitol as external plasticizer was necessary to obtain gas barrier films. The combinations of internal and external plasticization at selected ratios enabled the tailoring of film properties. Low to medium DS of HP and the addition of 10{\%} or 20{\%} sorbitol resulted in promising barrier properties. The tensile strength of the HPX films was rather high between 27 and 43 MPa, depending on the level and type of plasticization. The thermal stability of HPXs increased and the degree of crystallinity of xylan in the films decreased as the internal plasticization increased. The glass transition temperature of HPXs and HPX films decreased more with external than with internal plasticization. The studied concept would benefit the sustainable exploitation of natural resources. The promising material properties, high degree of biobased raw materials, and non-food origin make HPX-based films an interesting option for multilayer paperboard coating for food packaging, for example.",
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    author = "Mikkonen, {Kirsi S.} and Christiane Laine and Inkeri Kontro and Talja, {Riku A.} and Ritva Serimaa and Maija Tenkanen",
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    year = "2015",
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    language = "English",
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    Combination of internal and external plasticization of hydroxypropylated birch xylan tailors the properties of sustainable barrier films. / Mikkonen, Kirsi S.; Laine, Christiane; Kontro, Inkeri; Talja, Riku A.; Serimaa, Ritva; Tenkanen, Maija.

    In: European Polymer Journal, Vol. 66, No. May, 2015, p. 307-318.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Combination of internal and external plasticization of hydroxypropylated birch xylan tailors the properties of sustainable barrier films

    AU - Mikkonen, Kirsi S.

    AU - Laine, Christiane

    AU - Kontro, Inkeri

    AU - Talja, Riku A.

    AU - Serimaa, Ritva

    AU - Tenkanen, Maija

    N1 - Project code: 76880

    PY - 2015

    Y1 - 2015

    N2 - To develop functional and sustainable products from future wood biorefineries, birch kraft pulp xylan was alkali-extracted and modified in aqueous solvent with hydroxypropylation to enhance its processability to films. For the first time, the roles of internal vs. external plasticization in the mechanical, thermal, and barrier performance of xylan films were systematically evaluated as a function of the degree of substitution (DS) of hydroxypropyl (HP) groups (internal plasticizer) and the added sorbitol (external plasticizer). In addition, the moisture uptake and the degree of crystallinity of hydroxypropyl xylan (HPX) films were characterized. Internal plasticization of xylan with HP groups enabled cohesive film formation, but did not form barrier materials alone. The addition of sorbitol as external plasticizer was necessary to obtain gas barrier films. The combinations of internal and external plasticization at selected ratios enabled the tailoring of film properties. Low to medium DS of HP and the addition of 10% or 20% sorbitol resulted in promising barrier properties. The tensile strength of the HPX films was rather high between 27 and 43 MPa, depending on the level and type of plasticization. The thermal stability of HPXs increased and the degree of crystallinity of xylan in the films decreased as the internal plasticization increased. The glass transition temperature of HPXs and HPX films decreased more with external than with internal plasticization. The studied concept would benefit the sustainable exploitation of natural resources. The promising material properties, high degree of biobased raw materials, and non-food origin make HPX-based films an interesting option for multilayer paperboard coating for food packaging, for example.

    AB - To develop functional and sustainable products from future wood biorefineries, birch kraft pulp xylan was alkali-extracted and modified in aqueous solvent with hydroxypropylation to enhance its processability to films. For the first time, the roles of internal vs. external plasticization in the mechanical, thermal, and barrier performance of xylan films were systematically evaluated as a function of the degree of substitution (DS) of hydroxypropyl (HP) groups (internal plasticizer) and the added sorbitol (external plasticizer). In addition, the moisture uptake and the degree of crystallinity of hydroxypropyl xylan (HPX) films were characterized. Internal plasticization of xylan with HP groups enabled cohesive film formation, but did not form barrier materials alone. The addition of sorbitol as external plasticizer was necessary to obtain gas barrier films. The combinations of internal and external plasticization at selected ratios enabled the tailoring of film properties. Low to medium DS of HP and the addition of 10% or 20% sorbitol resulted in promising barrier properties. The tensile strength of the HPX films was rather high between 27 and 43 MPa, depending on the level and type of plasticization. The thermal stability of HPXs increased and the degree of crystallinity of xylan in the films decreased as the internal plasticization increased. The glass transition temperature of HPXs and HPX films decreased more with external than with internal plasticization. The studied concept would benefit the sustainable exploitation of natural resources. The promising material properties, high degree of biobased raw materials, and non-food origin make HPX-based films an interesting option for multilayer paperboard coating for food packaging, for example.

    KW - barrier properties

    KW - films

    KW - hydroxypropyl xylan

    KW - materials

    KW - polysaccharides

    U2 - 10.1016/j.eurpolymj.2015.02.034

    DO - 10.1016/j.eurpolymj.2015.02.034

    M3 - Article

    VL - 66

    SP - 307

    EP - 318

    JO - European Polymer Journal

    JF - European Polymer Journal

    SN - 0014-3057

    IS - May

    ER -