The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids

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dc.contributor.author Korpinen, Risto I.
dc.contributor.author Kilpeläinen, Petri
dc.contributor.author Sarjala, Tytti
dc.contributor.author Nurmi, Maristiina
dc.contributor.author Saloranta, Pauliina
dc.contributor.author Holmbom, Thomas
dc.contributor.author Koivula, Hanna
dc.contributor.author Mikkonen, Kirsi S.
dc.contributor.author Willför, Stefan
dc.contributor.author Saranpää, Pekka T.
dc.date.accessioned 2019-12-09T08:28:05Z
dc.date.available 2019-12-09T08:28:05Z
dc.date.issued 2019-12-01
dc.identifier.citation Korpinen, R.I.; Kilpeläinen, P.; Sarjala, T.; Nurmi, M.; Saloranta, P.; Holmbom, T.; Koivula, H.; Mikkonen, K.S.; Willför, S.; Saranpää, P.T. The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids. Molecules 2019, 24, 4391.
dc.identifier.uri http://hdl.handle.net/10138/307986
dc.description.abstract Suberin fatty acids were extracted from outer bark of Silver birch (<i>Betula pendula</i> Roth.) using an isopropanolic sodium hydroxide solution. Laboratory sheets composed of lignocellulosic fiber networks were prepared from unbleached and unrefined softwood kraft pulp and further impregnated with suberin fatty acid monomers and cured with maleic anhydride in ethanol solution. The treatment resulted in hydrophobic surfaces, in which the contact angles remained over 120 degrees during the entire measurement. The fiber network also retained its water vapor permeability and enhanced fiber&ndash;fiber bonding resulted in improved tensile strength of the sheets. Scanning electron microscopy (SEM) images revealed that the curing agent, together with suberin fatty acids, was evenly distributed on the fiber surfaces and smoothing occurred over the wrinkled microfibrillar structure. High concentrations of the curing agent resulted in globular structures containing betulinol derivates as revealed with time-of-flight secondary ion mass spectrometry (ToF-SIMS). Also, the larger amount of suberin fatty acid monomers slightly impaired the optical properties of sheets.
dc.publisher Multidisciplinary Digital Publishing Institute
dc.title The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids
dc.date.updated 2019-12-09T08:28:05Z
dc.type.uri http://purl.org/eprint/entityType/JournalArticle
dc.type.uri http://purl.org/eprint/entityType/Expression
dc.type.uri http://purl.org/eprint/entityType/Expression

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