Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • harvard-cite-them-right
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Synthesis and characterization of unsaturated lactic acid based thermoset bio-resins
Högskolan i Borås, Institutionen Ingenjörshögskolan. (Polymer Group)
Högskolan i Borås, Institutionen Ingenjörshögskolan. (Polymer Group)
Högskolan i Borås, Institutionen Ingenjörshögskolan. (Polymer Group)
Högskolan i Borås, Institutionen Ingenjörshögskolan. (Polymer Group)
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 67, s. 570-582Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Bio-based thermoset resins have been synthesized using lactic acid oligomers, which were functionalized with carbon–carbon double bonds, in order to allow their crosslinking by a free radical mechanism. Two different resin structures were synthesized. One resin was composed of an allyl alcohol terminated lactic acid oligomer, which was end-functionalized with methacrylic anhydride (MLA resin). The second resin was a mixture of the same allyl alcohol-lactic acid oligomer, and penthaerythritol. This mixture was end-functionalized with methacrylic anhydride, in order to get a methacrylate functionalized lactic acid oligomer, and methacrylate functionalized penthaerythritol (PMLA resin). The synthesized resins were characterized using FT-IR, 1H NMR and 13C NMR spectroscopy, differential scanning calorimetry as well as dynamic mechanical analysis to confirm the resin structure and reactivity. The flow viscosities were also measured in order to evaluate the suitability of the resins to be used as a matrix in composite applications. The results showed that the PMLA resin has better mechanical, thermal and rheological properties than the MLA resin, and both had properties which were comparable with a commercial unsaturated polyester resin. The high biobased content of 90% and the high glass transition temperature at 100 °C for the PMLA resin makes it an attractive candidate for composite applications where crude oil based unsaturated polyester resins are normally used.

Ort, förlag, år, upplaga, sidor
Pergamon Press , 2014. Vol. 67, s. 570-582
Nyckelord [en]
Bioresin, Lactic acid, Resursåtervinning
Nationell ämneskategori
Polymerkemi Materialkemi
Forskningsämne
Resursåtervinning
Identifikatorer
URN: urn:nbn:se:hb:diva-1996DOI: 10.1016/j.eurpolymj.2014.11.045Lokalt ID: 2320/14546OAI: oai:DiVA.org:hb-1996DiVA, id: diva2:870077
Tillgänglig från: 2015-11-13 Skapad: 2015-11-13 Senast uppdaterad: 2017-11-02Bibliografiskt granskad
Ingår i avhandling
1. Development of biocomposites from lactic acid thermoset resins and cellulose fibre reinforcements
Öppna denna publikation i ny flik eller fönster >>Development of biocomposites from lactic acid thermoset resins and cellulose fibre reinforcements
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Synthesis of polymers from renewable origin has been reported by many authors and it has been found out that it has enormous potential and can serve as alternative to conventional thermoplastics and thermosets in many applications. The use of these renewable resources will provide sustainable platforms to substitute fossil fuel-based materials. To date, efforts made to produce 100% bio-based thermosetting materials have yet to be achieved. Many studies have been reported on increasing the renewability ratio of thermoset materials produced.

A lot of reports have been made on the synthesis of thermoplastic resins from lactic acid for biomedical applications such as tissue engineering but only few reports have been made on composite applications. The issue of high melt viscosity of thermoplastic resins from lactic acid has been of paramount problem because of its difficulty in impregnation into fibre reinforcement. Bio-based thermoset resins have been produced for composite applications from plant oils and improved mechanical properties have been achieved.

In this thesis, an alternative route for synthesis of lactic acid based thermoset resins have been explored to solve the above problem. Thermoset resins were synthesized from lactic acid with different co-reactants and were characterized using NMR, FT-IR, DSC, DMA and TGA. Their rheological properties were also investigated. The resins were reinforced with natural and regenerated cellulose fibres in non-woven and woven form, and with different fibre alignment and fibre loading. The resulting composites were characterized by mechanical testing regarding tensile, flexural and impact strength, and by SEM analysis regarding morphology.

The results showed that these composites could possibly be used in automobile, transport, construction and furniture applications, particularly for interior purposes. The resins produced were found to be promising materials for composite production due to the good mechanical properties achieved.

Ort, förlag, år, upplaga, sidor
Borås: Högskolan i Borås, 2015. s. 47
Serie
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 58
Nyckelord
lactic acid, thermoset resin, renewable resources, natural fibre, regenerated cellulose fibre, composite
Nationell ämneskategori
Miljöbioteknik
Forskningsämne
Resursåtervinning
Identifikatorer
urn:nbn:se:hb:diva-23 (URN)978-91-87525-51-3 (ISBN)978-91-87525-52-0 (ISBN)
Disputation
2015-05-13, E310, University of Borås, Allégatan 1, Borås, 10:00 (Engelska)
Opponent
Tillgänglig från: 2015-05-19 Skapad: 2015-03-06 Senast uppdaterad: 2015-12-18Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltext

Personposter BETA

Bakare, FatimatÅkesson, DanSkrifvars, MikaelBashir, Tariq

Sök vidare i DiVA

Av författaren/redaktören
Bakare, FatimatÅkesson, DanSkrifvars, MikaelBashir, Tariq
Av organisationen
Institutionen Ingenjörshögskolan
I samma tidskrift
European Polymer Journal
PolymerkemiMaterialkemi

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 694 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • harvard-cite-them-right
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf