title: Clay nanopaper with tough cellulose nanofiber matrix for fire retardancy and gas barrier functions.
abstract: Nacre-mimicking hybrids of high inorganic content (>50 wt %) tend to show low strain-to-failure. Therefore, we prepared clay nanopaper hybrid composite montmorillonite platelets in a continuous matrix of nanofibrillated cellulose (NFC) with the aim of harnessing the intrinsic toughness of fibrillar networks. Hydrocolloid mixtures were used in a filtration approach akin to paper processing. The resulting multilayered structure of the nanopaper was studied by FE-SEM, FTIR, and XRD. Uniaxial stress-strain curves measured in tension and thermal analysis were carried out by DMTA and TGA. In addition, fire retardance and oxygen permeability characteristics were measured. The continuous NFC matrix is a new concept and provides unusual ductility to the nanocomposite, allowing inorganic contents as high as 90% by weight. Clay nanopaper extends the property range of cellulose nanopaper and is of interest in self-extinguishing composites and in oxygen barrier layers.
authors.affiliation: Wallenberg Wood Science Center, Royal Institute of Technology, KTH, SE-10044 Stockholm, Sweden.
authors.forename: Andong
authors.initials: A
authors.lastname: Liu
authors.forename: Andreas
authors.initials: A
authors.lastname: Walther
authors.forename: Olli
authors.initials: O
authors.lastname: Ikkala
authors.forename: Lyuba
authors.initials: L
authors.lastname: Belova
authors.forename: Lars A
authors.initials: LA
authors.lastname: Berglund
mesh_terms: D000538:Aluminum Silicates; D002482:Cellulose / Q000737:chemistry*; D000077215:Clay; D005411:Flame Retardants / Q000138:chemical synthesis*; D005740:Gases; D008422:Materials Testing; D055595:Mechanical Phenomena; D057139:Nanofibers / Q000737:chemistry*; D010209:Paper
chemical_list: D000538:Aluminum Silicates; D005411:Flame Retardants; D005740:Gases; D002482:Cellulose; D000077215:Clay