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Water repellency improvement of cellulosic textile fibers by betulin and a betulin-based copolymer
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Träkemi och massateknologi.
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.ORCID-id: 0000-0002-7055-1057
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Träkemi och massateknologi.
2018 (engelsk)Inngår i: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 25, nr 3, s. 2115-2128Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Springer, 2018. Vol. 25, nr 3, s. 2115-2128
Emneord [en]
Betulin, Cellulose, Contact angle, Copolymer, Textile, Water repellency
HSV kategori
Identifikatorer
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
Merknad

QC 20180403

Tilgjengelig fra: 2018-04-03 Laget: 2018-04-03 Sist oppdatert: 2019-02-05bibliografisk kontrollert
Inngår i avhandling
1. Betulin-modified cellulosic textile fibers with improved water repellency, hydrophobicity and antibacterial properties
Åpne denne publikasjonen i ny fane eller vindu >>Betulin-modified cellulosic textile fibers with improved water repellency, hydrophobicity and antibacterial properties
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2019. s. 35
Serie
TRITA-CBH-FOU ; 2019:14
Emneord
Antibacterial, Betulin, Biorefinery, Cellulose, Grafting, Coating, Hydrophobicity, Textile, Water repellency
HSV kategori
Forskningsprogram
Fiber- och polymervetenskap
Identifikatorer
urn:nbn:se:kth:diva-243638 (URN)978-91-7873-109-1 (ISBN)
Presentation
2019-02-28, Rånbyrummet, Teknikringen 56, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20190205

Tilgjengelig fra: 2019-02-05 Laget: 2019-02-05 Sist oppdatert: 2019-02-05bibliografisk kontrollert

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