Crosslinking as an efficient tool for decreasing moisture sensitivity of biobased nanocomposite films

Jari Vartiainen, Ali Harlin

    Research output: Contribution to journalArticleScientificpeer-review


    Chitosan-nanoclay bio-hybrid films were successfully crosslinked with glutaraldehyde, genipin and glyoxal. Moisture sensitivity of films decreased as a result of crosslinking which led to improved barrier properties against water vapor and oxygen. Films containing chitosan (6.6 g/m2) with genipin (3.3 g/m2) and nanoclay (6.6 g/m2) had water vapor transmission rate of 72 g × 100 µm/(m2 × 24 h) which was 34% lower as compared to pure chitosan and 30% lower as compared to chitosan/nanoclay without crosslinkers. Glyoxal induced crosslinking resulted in 92% reduction in oxygen transmission rate at 80% relative humidity as compared to pure chitosan films. Oxygen transmission through glyoxal (3.3 g/m2) treated chitosan/nanoclay film was 2.8 cm3 × 100 µm/( m2 × 24 h) which was 53% lower as compared to chi-tosan/nanoclay without crosslinkers. In addition, nanoclay and especially glyoxal crosslinking prevented the water va-por sorption of chitosan considerably. Crosslinking may be used as an efficient tool for enhancing the exploitability of naturally hydrophilic biopolymers towards new high-value applications, such as food packaging.
    Original languageEnglish
    Pages (from-to)346-354
    Number of pages9
    JournalMaterials Sciences and Applications
    Issue number5
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed


    • Chitosan
    • nanoclay
    • crosslinking
    • barrier
    • packaging
    • glutaraldehyde
    • genipin
    • glyoxal


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