Suberin based polyesters
In the wish to replace oil-based chemicals and materials with such based on biodegradable and renewable resources, this work has been performed. In a biorefinary concept, waste birch bark from paper pulp mills and timber production has been evaluated as a potential source for polyesters. In the pres...
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KTH, Fiber- och polymerteknologi
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ftkthstockholm:oai:DiVA.org:kth-10528 2023-05-15T14:01:36+02:00 Suberin based polyesters Olsson, Ann 2009 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10528 eng eng KTH, Fiber- och polymerteknologi Stockholm : KTH Trita-CHE-Report, 1654-1081 2009:21 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10528 urn:isbn:978-91-7415-311-8 info:eu-repo/semantics/openAccess Paper Pulp and Fiber Technology Pappers- massa- och fiberteknik Licentiate thesis, comprehensive summary info:eu-repo/semantics/masterThesis text 2009 ftkthstockholm 2022-08-11T12:33:33Z In the wish to replace oil-based chemicals and materials with such based on biodegradable and renewable resources, this work has been performed. In a biorefinary concept, waste birch bark from paper pulp mills and timber production has been evaluated as a potential source for polyesters. In the present thesis investigations are made on synthesis of epoxy-functionalized polyesters from the birch outer bark aliphatic suberin ω-hydroxy fatty acid, cis-9,10-epoxy-18-hydroxyoctadecanoic acid. Studies of accessibility and reactivity of cellulose have been performed as a first step to enable covalent attachment or grafting of the epoxy-functionalized polyesters to cellulose. Candida antarctica lipase B (Novozym 435) is reported to be an efficient catalyst for condensation polymerization of cis-9,10-epoxy-18-hydroxyoctadecanoic acid to form poly(9,10-epoxy-18-hydroxyoctadecanoic acid) with high molecular weight (Mw). Performed in toluene in the presence of molecular sieves a Mw of 20000 (reaction time 68 h, Mw/Mn 2.2) was obtained. Performed in bulk without any drying agent a Mw of 15000 was obtained at a much shorter reaction time (reaction time 3h, Mw/Mn 2.2). Further the same lipase has been used for succesful co-polymerizations of cis-9,10-epoxy-18-hydroxyoctadecanoic acid with lactones. By combining condensation and ring-opening polymerization, epoxy-functionalized linear polyesters and cyclic oligomers have been synthesized. For example, co-polymerization of cis-9,10-epoxy-18-hydroxy-octadecanoic acid and ε-caprolactone performed in toluene in the presence of molecular sieves gave mainly cyclic oligomers, especially at shorter reaction times. Co-polymerization performed in bulk gave linear polyesters with a Mw of 35000 (reaction time 24 h, Mw/Mn 6), irrespective molecular sieves were added or not. The epoxy-functionalized polyesters could be used for surface modification of pulp fibres and cellulose fibrils, which further can be used for production of new valuable composite materials with improved features. ... Master Thesis Antarc* Antarctica Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA |
institution |
Open Polar |
collection |
Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA |
op_collection_id |
ftkthstockholm |
language |
English |
topic |
Paper Pulp and Fiber Technology Pappers- massa- och fiberteknik |
spellingShingle |
Paper Pulp and Fiber Technology Pappers- massa- och fiberteknik Olsson, Ann Suberin based polyesters |
topic_facet |
Paper Pulp and Fiber Technology Pappers- massa- och fiberteknik |
description |
In the wish to replace oil-based chemicals and materials with such based on biodegradable and renewable resources, this work has been performed. In a biorefinary concept, waste birch bark from paper pulp mills and timber production has been evaluated as a potential source for polyesters. In the present thesis investigations are made on synthesis of epoxy-functionalized polyesters from the birch outer bark aliphatic suberin ω-hydroxy fatty acid, cis-9,10-epoxy-18-hydroxyoctadecanoic acid. Studies of accessibility and reactivity of cellulose have been performed as a first step to enable covalent attachment or grafting of the epoxy-functionalized polyesters to cellulose. Candida antarctica lipase B (Novozym 435) is reported to be an efficient catalyst for condensation polymerization of cis-9,10-epoxy-18-hydroxyoctadecanoic acid to form poly(9,10-epoxy-18-hydroxyoctadecanoic acid) with high molecular weight (Mw). Performed in toluene in the presence of molecular sieves a Mw of 20000 (reaction time 68 h, Mw/Mn 2.2) was obtained. Performed in bulk without any drying agent a Mw of 15000 was obtained at a much shorter reaction time (reaction time 3h, Mw/Mn 2.2). Further the same lipase has been used for succesful co-polymerizations of cis-9,10-epoxy-18-hydroxyoctadecanoic acid with lactones. By combining condensation and ring-opening polymerization, epoxy-functionalized linear polyesters and cyclic oligomers have been synthesized. For example, co-polymerization of cis-9,10-epoxy-18-hydroxy-octadecanoic acid and ε-caprolactone performed in toluene in the presence of molecular sieves gave mainly cyclic oligomers, especially at shorter reaction times. Co-polymerization performed in bulk gave linear polyesters with a Mw of 35000 (reaction time 24 h, Mw/Mn 6), irrespective molecular sieves were added or not. The epoxy-functionalized polyesters could be used for surface modification of pulp fibres and cellulose fibrils, which further can be used for production of new valuable composite materials with improved features. ... |
format |
Master Thesis |
author |
Olsson, Ann |
author_facet |
Olsson, Ann |
author_sort |
Olsson, Ann |
title |
Suberin based polyesters |
title_short |
Suberin based polyesters |
title_full |
Suberin based polyesters |
title_fullStr |
Suberin based polyesters |
title_full_unstemmed |
Suberin based polyesters |
title_sort |
suberin based polyesters |
publisher |
KTH, Fiber- och polymerteknologi |
publishDate |
2009 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10528 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Trita-CHE-Report, 1654-1081 2009:21 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10528 urn:isbn:978-91-7415-311-8 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766271525070045184 |