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On Shaping Mechanical Properties of Lignocellulosic Materials by Benign Chemical Processing
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kemiteknik.
2016 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Sundsvall: Mid Sweden University , 2016. , s. 33
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 124
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:miun:diva-29721ISBN: 978-91-88025-72-2 (tryckt)OAI: oai:DiVA.org:miun-29721DiVA, id: diva2:1058749
Presentation
2016-06-03, O102, Sundsvall, 10:15 (Engelska)
Handledare
Anmärkning

Vid tidpunkten för framläggningen var följande delarbeten opublicerade: delarbete 1  inskickat, delarbete 3 manuskript.

At the time of the defence the following papers were unpublished: paper 1  submitted, paper 3 manuscript.

Tillgänglig från: 2016-12-21 Skapad: 2016-12-21 Senast uppdaterad: 2016-12-21Bibliografiskt granskad
Delarbeten
1. Fibre stress-strain response of high temperature chemi-thermomechanical pulp treated with switchable ionic liquids
Öppna denna publikation i ny flik eller fönster >>Fibre stress-strain response of high temperature chemi-thermomechanical pulp treated with switchable ionic liquids
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2016 (Engelska)Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, nr 4, s. 8570-8588Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The removal of lignin from a high-temperature chemi-thermomechanical pulp (HT-CTMP) using a switchable ionic liquid prepared from an organic superbase (1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)), monoethanol amine (MEA), and SO2 was investigated. The objective was to measure the fibre properties before and after removal of the lignin to analyse the contributions from lignin in the HT-CTMP fibre to the tensile properties. It was found that the fibre displacement at break - measured in zero span, which is related to fibre strain at break - was not influenced by the lignin removal in this ionic liquid system when tested dry. There was a small increase in displacement at break and a reduction in tensile strength at zero span when tested after rewetting. At short span, the displacement at break decreased slightly when lignin was removed, while tensile strength was almost unaffected when tested dry. Under rewetted conditions, the displacement at break increased and tensile strength decreased after lignin removal. Nevertheless, no dramatic differences in the pulp properties could be observed. Under the experimental conditions, treatment with the ionic liquid reduced the lignin content from 37.4 to 15.5 wt%.

Nyckelord
Ionic liquid, Delignification, Spruce, Cellulose, Zero span, Short span
Nationell ämneskategori
Teknik och teknologier Kemiteknik
Identifikatorer
urn:nbn:se:miun:diva-28633 (URN)10.15376/biores.11.4.8570-8588 (DOI)000391801300037 ()
Tillgänglig från: 2016-11-15 Skapad: 2016-08-26 Senast uppdaterad: 2017-08-08Bibliografiskt granskad
2. Acid-Catalyzed Synthesis of Foamed Materials from Renewable Sources
Öppna denna publikation i ny flik eller fönster >>Acid-Catalyzed Synthesis of Foamed Materials from Renewable Sources
2014 (Engelska)Ingår i: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 53, nr 45, s. 17597-17603Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this study, lightweight biobased foamed materials were successfully synthesized by the modification of renewable polysaccharides, such as starch and microcrystalline cellulose. Low-cost and nontoxic organic acids were utilized as catalysts in the first-step esterification reaction of the synthesis. The effects of different reaction conditions on the water absorbency and weight loss of freeze-casted polysaccharide–citrate–chitosan foams are discussed. Physical properties, such as pore-size distributions and compressive stress–strain curves, of the foams were determined. The characterization results show that the amide bonds formed between the carboxylic acid groups of polysaccharide–citrate and the amino groups of chitosan are crucial to the foamed material’s performance.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2014
Nationell ämneskategori
Kemiska processer
Identifikatorer
urn:nbn:se:miun:diva-23772 (URN)10.1021/ie501169w (DOI)000344906400009 ()2-s2.0-84910128893 (Scopus ID)
Projekt
FORE
Tillgänglig från: 2014-12-15 Skapad: 2014-12-15 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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