Hydrophobic materials based on cotton linter cellulose and an epoxy-activated polyester derived from a suberin monomer
2015 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal, Editorial material (Refereed) Published
Suberin is a natural hydrophobic material that could be used to improve the water repellency of cellulose surfaces. It is also abundant in the outer bark of birch (Betula verrucosa); birch bark is a side-stream product in Scandinavia from the forest industry, which is generally burned for energy production. A suberin monomer, cis-9,10-epoxy-18-hydroxyoctadecanoic acid, was isolated from birch outer bark and polymerized via lipase (immobilized Candida antarctica lipase B). The resulting epoxy-activated polyester was characterized by nuclear magnetic resonance (NMR) imaging, matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry, and size exclusion chromatography. Then the polyester was cured with tartaric or oxalic acid, and the crosslinked polyesters were characterized by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry. Hydrophobic materials were prepared by compression molding of polyester-impregnated cellulose sheets, and the final products were characterized by FTIR, cross-polarization magic angle spinning 13 C NMR, and field-emission scanning electron microscopy. The water contact angle was significantly increased from 0 ° for the original cellulose sheets to over 100 ° for the produced hydrophobic materials.
Place, publisher, year, edition, pages
Walter de Gruyter, 2015.
cellulose, epoxy acid, hydrophobic, polyester, suberin
IdentifiersURN: urn:nbn:se:kth:diva-166256DOI: 10.1515/hf-2014-0261ISI: 000358410200008ScopusID: 2-s2.0-84958524574OAI: oai:DiVA.org:kth-166256DiVA: diva2:810109
ProjectsWOBAMA - Wood based materials and fuels
QC 201506042015-05-062015-05-062015-09-01Bibliographically approved