Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide: Enhanced toughness towards material development

Alexey Khakalo, Ilari Filpponen, Orlando J. Rojas

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50% in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130%) and tensile toughness (by 60%) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12%, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.

    Original languageEnglish
    Pages (from-to)145-151
    Number of pages7
    JournalComposites Science and Technology
    Volume160
    DOIs
    Publication statusPublished - 26 May 2018
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Cellulose
    Toughness
    Casein
    Adhesion
    Caseins
    Proteins
    Acids
    Composite materials
    Surface treatment
    Nanocomposites
    Thermoforming
    Packaging materials
    Compatibilizers
    poly(lactic acid)
    poly(lactide)
    Animals
    Tensile strength
    Elastic moduli
    Adsorption
    Mechanical properties

    Keywords

    • Adhesion
    • Composites
    • Nanofibrillated cellulose
    • Polylactide
    • Proteins

    Cite this

    @article{49dfb83806414238bbd38126f5f06f3c,
    title = "Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide: Enhanced toughness towards material development",
    abstract = "The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50{\%} in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130{\%}) and tensile toughness (by 60{\%}) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12{\%}, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.",
    keywords = "Adhesion, Composites, Nanofibrillated cellulose, Polylactide, Proteins",
    author = "Alexey Khakalo and Ilari Filpponen and Rojas, {Orlando J.}",
    year = "2018",
    month = "5",
    day = "26",
    doi = "10.1016/j.compscitech.2018.03.013",
    language = "English",
    volume = "160",
    pages = "145--151",
    journal = "Composites Science and Technology",
    issn = "0266-3538",
    publisher = "Elsevier",

    }

    Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide : Enhanced toughness towards material development. / Khakalo, Alexey; Filpponen, Ilari; Rojas, Orlando J.

    In: Composites Science and Technology, Vol. 160, 26.05.2018, p. 145-151.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide

    T2 - Enhanced toughness towards material development

    AU - Khakalo, Alexey

    AU - Filpponen, Ilari

    AU - Rojas, Orlando J.

    PY - 2018/5/26

    Y1 - 2018/5/26

    N2 - The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50% in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130%) and tensile toughness (by 60%) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12%, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.

    AB - The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50% in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130%) and tensile toughness (by 60%) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12%, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.

    KW - Adhesion

    KW - Composites

    KW - Nanofibrillated cellulose

    KW - Polylactide

    KW - Proteins

    UR - http://www.scopus.com/inward/record.url?scp=85044754894&partnerID=8YFLogxK

    U2 - 10.1016/j.compscitech.2018.03.013

    DO - 10.1016/j.compscitech.2018.03.013

    M3 - Article

    AN - SCOPUS:85044754894

    VL - 160

    SP - 145

    EP - 151

    JO - Composites Science and Technology

    JF - Composites Science and Technology

    SN - 0266-3538

    ER -