onr:"swepub:oai:DiVA.org:kth-118261"
Search: onr:"swepub:oai:DiVA.org:kth-118261" > Pretreatment of sof...
- 1 of 1
- Previous record
- Next record
- To hitlist
Pretreatment of softwood dissolving pulp with ionic liquids
-
- Li, Dongfang (author)
- KTH,Träkemi och massateknologi
-
- Sevastyanova, Olena (author)
- KTH,Träkemi och massateknologi
-
- Ek, Monica (author)
- KTH,Träkemi och massateknologi
- (creator_code:org_t)
- 2012-06-22
- 2012
- English.
- In: Holzforschung. - : Walter de Gruyter GmbH. - 0018-3830 .- 1437-434X. ; 66:8, s. 935-943
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- Few Scandinavian pulp mills produce dissolving pulps; however, the demand on textile fibers is increasing. This study investigates the chemical interaction of dissolving pulp with ionic liquids (ILs), where softwood and hardwood industrial dissolving pulps were pretreated with ILs 1-butyl-3-methyl-imidazolium acetate ([C(4)mim(+)]CH3COO-) and 1-butyl-3-methyl-imdazolium chloride ([C(4)mim(+)]Cl-). Time and temperature dependence of the dissolution process as well as the impact of the pretreatment on the molecular weight properties, thermal stability, morphology, and crystallinity of the cellulose were evaluated by means of size exclusion chromatography (SEC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and solid state nuclear magnetic resonance (NMR). It was shown that the dissolution of cellulosic material in ILs is a temperature-dependent process; however, the viscosity of ILs affected the efficiency of dissolution at a given temperature. Molecular weight properties were affected negatively by increased dissolution temperature, while the type of antisolvent for the regeneration had no major impact on the degree of polymerization of cellulose. Water was more efficient than ethanol for the regeneration of cellulose when performed at an elevated temperature. The pretreatment decreased the crystallinity of cellulosic material. This might lead to the increased accessibility and reactivity of cellulose.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
Keyword
- 1-butyl-3-methyl-imidazolium acetate
- 1-butyl-3-methyl-imdazolium chloride
- cellulose
- crystallinity
- dissolution
- dissolving pulp
- ionic liquids (ILs)
- molecular weight distribution
- morphology
- regeneration
- softwood
- thermal stability
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
- Holzforschung (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Li, Dongfang
- Sevastyanova, Ol ...
- Ek, Monica
- About the subject
-
- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
- and Materials Engine ...
- and Paper Pulp and F ...
- Articles in the publication
- Holzforschung
- By the university
- Royal Institute of Technology
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
