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On Shaping Mechanical Properties of Lignocellulosic Materials by Benign Chemical Processing
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2016. , 33 p.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 124
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-29721ISBN: 978-91-88025-72-2 (print)OAI: oai:DiVA.org:miun-29721DiVA: diva2:1058749
Presentation
2016-06-03, O102, Sundsvall, 10:15 (English)
Supervisors
Note

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At the time of the defence the following papers were unpublished: paper 1  submitted, paper 3 manuscript.

Available from: 2016-12-21 Created: 2016-12-21 Last updated: 2016-12-21Bibliographically approved
List of papers
1. Fibre stress-strain response of high temperature chemi-thermomechanical pulp treated with switchable ionic liquids
Open this publication in new window or tab >>Fibre stress-strain response of high temperature chemi-thermomechanical pulp treated with switchable ionic liquids
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2016 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 4, 8570-8588 p.Article in journal (Refereed) 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%.

Keyword
Ionic liquid, Delignification, Spruce, Cellulose, Zero span, Short span
National Category
Engineering and Technology Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-28633 (URN)10.15376/biores.11.4.8570-8588 (DOI)000391801300037 ()
Available from: 2016-11-15 Created: 2016-08-26 Last updated: 2017-08-08Bibliographically approved
2. Acid-Catalyzed Synthesis of Foamed Materials from Renewable Sources
Open this publication in new window or tab >>Acid-Catalyzed Synthesis of Foamed Materials from Renewable Sources
2014 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 53, no 45, 17597-17603 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:miun:diva-23772 (URN)10.1021/ie501169w (DOI)000344906400009 ()2-s2.0-84910128893 (Scopus ID)
Projects
FORE
Available from: 2014-12-15 Created: 2014-12-15 Last updated: 2017-12-05Bibliographically approved

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Duan, Ran

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