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Improving the therm...
Improving the thermal stability of different types of xylan by acetylation
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- de Carvalho, Danila Morais (författare)
- KTH,Royal Inst Technol, Dept Fibre & Polymer Technol, SE-10044 Stockholm, Sweden.;KTH, Royal Inst Technol, Dept Fibre & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.;Univ Helsinki, Dept Food & Nutr, FI-00014 Helsinki, Finland.
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- Berglund, Jennie (författare)
- KTH,Fiber- och polymerteknologi
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- Marchand, Celia (författare)
- KTH,Fiber- och polymerteknologi
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- Lindström, Mikael, Professor, 1967- (författare)
- KTH,Fiber- och polymerteknologi
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- Vilaplana, Francisco, 1979- (författare)
- KTH,Fiber- och polymerteknologi
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- Sevastyanova, Olena (författare)
- KTH,Fiber- och polymerteknologi,Wallenberg Wood Science Center
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KTH Royal Inst Technol, Dept Fibre & Polymer Technol, SE-10044 Stockholm, Sweden;KTH, Royal Inst Technol, Dept Fibre & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.;Univ Helsinki, Dept Food & Nutr, FI-00014 Helsinki, Finland. (creator_code:org_t)
- ELSEVIER SCI LTD, 2019
- 2019
- Engelska.
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Ingår i: Carbohydrate Polymers. - : ELSEVIER SCI LTD. - 0144-8617 .- 1879-1344. ; 220, s. 132-140
- Relaterad länk:
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https://helda.helsin...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The impact of various degrees of acetylation on improving the thermal stability of xylan isolated from different botanical source has been studied; methylglucuronoxylan from birch and eucalyptus, arabinoglucuronoxylan from spruce and glucuronoarabinoxylan from sugarcane bagasse and straw. The lower molecular weight of nonacetylated methylglucuronoxylan (17.7-23.7 kDa) and arabinoglucuronoxylan (16.8 kDa) meant that they were more soluble in water than glucuronoarabinoxylan (43.0-47.0 kDa). The temperature at the onset of degradation increased by 17-61 degrees C and by 75-145 degrees C for low and high acetylated xylans respectively, as a result of acetylation. A glass transition temperature in the range of 121-132 degrees C was observed for the samples non-acetylated and acetylated at low degree of acetylation (0.0-0.6). The acetylation to higher degrees (1.4-1.8) increased the glass transition temperature of the samples to 189-206 degrees C. Acetylation proved to be an efficient method for functionalization of the xylan to increase the thermal stability.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Polymerteknologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Polymer Technologies (hsv//eng)
Nyckelord
- Acetylation
- Hardwood
- Molecular weight
- Softwood
- Sugarcane residues
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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