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The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids
Suberin fatty acids were extracted from outer bark of Silver birch (Betula pendula 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 suberi...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6930657/ https://www.ncbi.nlm.nih.gov/pubmed/31805659 http://dx.doi.org/10.3390/molecules24234391 |
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author | Korpinen, Risto I. Kilpeläinen, Petri Sarjala, Tytti Nurmi, Maristiina Saloranta, Pauliina Holmbom, Thomas Koivula, Hanna Mikkonen, Kirsi S. Willför, Stefan Saranpää, Pekka T. |
author_facet | Korpinen, Risto I. Kilpeläinen, Petri Sarjala, Tytti Nurmi, Maristiina Saloranta, Pauliina Holmbom, Thomas Koivula, Hanna Mikkonen, Kirsi S. Willför, Stefan Saranpää, Pekka T. |
author_sort | Korpinen, Risto I. |
collection | PubMed |
description | Suberin fatty acids were extracted from outer bark of Silver birch (Betula pendula 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–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. |
format | Online Article Text |
id | pubmed-6930657 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-69306572019-12-26 The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids Korpinen, Risto I. Kilpeläinen, Petri Sarjala, Tytti Nurmi, Maristiina Saloranta, Pauliina Holmbom, Thomas Koivula, Hanna Mikkonen, Kirsi S. Willför, Stefan Saranpää, Pekka T. Molecules Article Suberin fatty acids were extracted from outer bark of Silver birch (Betula pendula 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–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. MDPI 2019-12-01 /pmc/articles/PMC6930657/ /pubmed/31805659 http://dx.doi.org/10.3390/molecules24234391 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Korpinen, Risto I. Kilpeläinen, Petri Sarjala, Tytti Nurmi, Maristiina Saloranta, Pauliina Holmbom, Thomas Koivula, Hanna Mikkonen, Kirsi S. Willför, Stefan Saranpää, Pekka T. The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids |
title | The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids |
title_full | The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids |
title_fullStr | The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids |
title_full_unstemmed | The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids |
title_short | The Hydrophobicity of Lignocellulosic Fiber Network Can Be Enhanced with Suberin Fatty Acids |
title_sort | hydrophobicity of lignocellulosic fiber network can be enhanced with suberin fatty acids |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6930657/ https://www.ncbi.nlm.nih.gov/pubmed/31805659 http://dx.doi.org/10.3390/molecules24234391 |
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