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Betulin-modified cellulosic textile fibers with improved water repellency, hydrophobicity and antibacterial properties
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Wood Chemistry and Pulp Technology.ORCID iD: 0000-0003-4115-5079
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Textiles made from natural sources, such as cotton and flax, have advantages over those made of synthetic fibers in terms of sustainability. Unlike major synthetic fibers that have a negative impact on the environment due to poor biodegradability, cotton cellulose is a renewable material.Cotton cellulose fibers exhibit various attractive characteristics such as softness and inexpensiveness. Cellulosic textiles can be easily wetted, since the structure contains a large amount of hydrophilic hydroxyl groups, and when water repellency is needed, this is a disadvantage. Currently, paraffin waxes or fluorinated silanes are used to achieve hydrophobicity, but this contradicts the concept of green chemistry since these chemicals are not biodegradable. The use of bio-based materials like forest residues or side-streams from forest product industries might be a good alternative, since this not only decreases the pressure on the environment but can also increase the value of these renewable resources.Betulin is a hydrophobic extractive present in the outer bark of birch trees (Betula verrucosa). Nowadays, the birch bark containing betulin generated in the paper industry is disposed of by incineration as a solid fuel to provide energy, but this application is not highly valuable and this motivates us to see whether betulin can be used as a hydrophobe to prepare waterproof cellulosic textiles. Methods of dip-coating, film compression molding and grafting were performed to build “betulin-cellulosic textile system” to render the textile with hydrophobicity and other functions. The textile impregnated in a solution of betulin-based copolymer exhibited a contact angle of 151°, which indicated that superhydrophobicity can be reached. AATCC water spray test results showed that cellulosic textile coated with betulin-based film had a water repellency of 80, which is the third highest class according to the rating standards. Betulin-grafted textiles were also prepared and showed a static water contact angle of 136°, and an antibacterial property with a bacterial removal of 99%.This thesis proposes that betulin can be used as a green alternative in functional material preparation. By developing betulin, a more value-added application rather than incineration can be achieved.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. , p. 35
Series
TRITA-CBH-FOU ; 2019:14
Keywords [en]
Antibacterial, Betulin, Biorefinery, Cellulose, Grafting, Coating, Hydrophobicity, Textile, Water repellency
National Category
Chemical Sciences
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-243638ISBN: 978-91-7873-109-1 (print)OAI: oai:DiVA.org:kth-243638DiVA, id: diva2:1285924
Presentation
2019-02-28, Rånbyrummet, Teknikringen 56, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20190205

Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-02-05Bibliographically approved
List of papers
1. Water repellency improvement of cellulosic textile fibers by betulin and a betulin-based copolymer
Open this publication in new window or tab >>Water repellency improvement of cellulosic textile fibers by betulin and a betulin-based copolymer
2018 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 25, no 3, p. 2115-2128Article in journal (Refereed) Published
Abstract [en]

Betulin is a naturally abundant and hydrophobic compound in the outer bark of birch and can readily be obtained by solvent extraction. Here, solutions of betulin were used to treat cotton fabrics and improve their water repellency. Cotton fabric impregnated in a solution of betulin in ethanol showed a contact angle for water of approximately 153A degrees and reached a water repellency score of 70 according to a standard water repellency test method. A betulin-terephthaloyl chloride (TPC) copolymer was synthesized. Both betulin and betulin-TPC copolymer were characterized by nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. The copolymer was characterized by size exclusion chromatography and differential scanning calorimetry. When impregnated with a solution of betulin-TPC copolymer in tetrahydrofuran, a cotton fabric showed a water contact angle of 151A degrees and also reached a water repellency score of 70. Films based on betulin and betulin-TPC copolymer were prepared and coated onto the surface of the fabrics by compression molding. These coated fabrics showed water contact angles of 123A degrees and 104A degrees respectively and each reached a water repellency score of 80.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Betulin, Cellulose, Contact angle, Copolymer, Textile, Water repellency
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-225201 (URN)10.1007/s10570-018-1695-5 (DOI)000427379200044 ()2-s2.0-85041537084 (Scopus ID)
Note

QC 20180403

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2019-02-05Bibliographically approved
2. Hydrophobic and antibacterial textile fibres prepared by covalently attaching betulin to cellulose
Open this publication in new window or tab >>Hydrophobic and antibacterial textile fibres prepared by covalently attaching betulin to cellulose
2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Betulin, a natural compound extractable from the outer bark of birch, can be used to improve the properties of cellulosic textile fibres. Herein, oxidation was performed to prepare carboxyl-functionalized cellulose, which was subsequently covalently attached by betulin through esterification. The surface-modified cellulosic textile fibres showed a substantially improved hydrophobicity, as indicated by a water contact angle of 136°. Moreover, the material showed excellent antibacterial properties, as indicated by over 99% bacterial removal and growth inhibition, in both Gram-positive and Gram-negative bacterial assays. The method of surface-modification of the cellulosic materials adapted in this study is simple and, to the best of our knowledge, has not been carried out before. The results of this study prove that betulin, a side-stream product produced by forest industry, could be used in value-added applications, such as for preparing functional materials. Additionally, this modification route can be envisaged to be applied to other cellulose sources (e.g., microfibrillated cellulose) to achieve the goal of functionalization.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-243083 (URN)10.1007/s10570-019-02265-8 (DOI)2-s2.0-85060491197 (Scopus ID)
Note

QC 20190205

Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-04-04Bibliographically approved

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