title: Adapting wood hydrolysate barriers to high humidity conditions.
abstract: The incorporation of layered silicates in bio-based barrier films resulted in lower water vapor permeability, and significantly lowered oxygen permeability at a relative humidity (RH) as high as 80%, with reduced moisture sensitivity of the wood hydrolysate (WH) based films. The applicability of WH based films was accordingly extended over a wider relative humidity condition range. Crude aqueous process liquor, the WH, was extracted from hardwood and utilized as a feed-stock for films without any upgrading pretreatment, yet producing superior oxygen barrier performance compared to partially upgraded WH and highly purified hemicelluloses. Films composed of crude WH and either one of two types of naturally occurring layered silicates, montmorillonite (MMT) or talc, as mineral additives, were evaluated with respect to oxygen and water vapor permeability, morphological, tensile and dynamic thermo-mechanical properties. Films with an oxygen permeability as low as 1.5 (cm(3)μm)/(m(2)daykPa) at 80% RH was achieved.
authors.affiliation: Fiber and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56, SE-100 44 Stockholm, Sweden.
authors.forename: Anas Ibn
authors.initials: AI
authors.lastname: Yaich
authors.forename: Ulrica
authors.initials: U
authors.lastname: Edlund
authors.forename: Ann-Christine
authors.initials: AC
authors.lastname: Albertsson
mesh_terms: D006813:Humidity; D006868:Hydrolysis; D010100:Oxygen / Q000737:chemistry; D013696:Temperature; D013718:Tensile Strength; D014835:Volatilization; D014867:Water / Q000737:chemistry; D014934:Wood / Q000737:chemistry*
chemical_list: D014867:Water; D010100:Oxygen
keywords: Coating; Film; Layered silicates; Oxygen barrier; Packaging; Wood hydrolysate; Xylan