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Water repellency improvement of cellulosic textile fibers by betulin and a betulin-based copolymer
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Wood Chemistry and Pulp Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-7055-1057
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Wood Chemistry and Pulp Technology.
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. Vol. 25, no 3, p. 2115-2128
Keywords [en]
Betulin, Cellulose, Contact angle, Copolymer, Textile, Water repellency
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-225201DOI: 10.1007/s10570-018-1695-5ISI: 000427379200044Scopus ID: 2-s2.0-85041537084OAI: oai:DiVA.org:kth-225201DiVA, id: diva2:1194620
Note

QC 20180403

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2019-02-05Bibliographically approved
In thesis
1. Betulin-modified cellulosic textile fibers with improved water repellency, hydrophobicity and antibacterial properties
Open this publication in new window or tab >>Betulin-modified cellulosic textile fibers with improved water repellency, hydrophobicity and antibacterial properties
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
Antibacterial, Betulin, Biorefinery, Cellulose, Grafting, Coating, Hydrophobicity, Textile, Water repellency
National Category
Chemical Sciences
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-243638 (URN)978-91-7873-109-1 (ISBN)
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

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Li, DongfangEk, Monica

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