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Enhancement of molecular weight of L-lactic acid polycondensates under vacuum in solid state

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dc.title Enhancement of molecular weight of L-lactic acid polycondensates under vacuum in solid state en
dc.contributor.author Kucharczyk, Pavel
dc.contributor.author Sedlařík, Vladimír
dc.contributor.author Junkar, Ita
dc.contributor.author Kreuh, Darij
dc.contributor.author Sáha, Petr
dc.relation.ispartof Materiali in Tehnologije
dc.identifier.issn 1580-2949 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2012
utb.relation.volume 46
utb.relation.issue 1
dc.citation.spage 37
dc.citation.epage 41
dc.type article
dc.language.iso en
dc.publisher Institut za Kovinske Materiale in Tehnologije Ljubljana sl
dc.relation.uri http://mit.imt.si/Revija/mit121.html
dc.subject poly(lactic acid) en
dc.subject solid state postpolycondensation en
dc.subject molecular weight enhancement en
dc.description.abstract Enhancement of L-lactic acid polycondensates by involving of postpolycondensation reactions in solid state under vacuum and catalyzed by stannous 2-ethylhexanoate were studied in the presented work. The catalyst was used only in postpolycondensation step. An effect of the catalyst concentration and postpolycondensation reaction time on resulting properties of poly(lactic acid) was studied by gel permeation chromatography. Fourier transform infrared spectroscopy and differential scanning calorimetry. Results show significant enhancement of molecular weight in case of the systems containing 2 wt. % of the catalyst due to the postpolycondensation procedure (M-W similar to 91.0 kg/mol; i.e. 1655 % after 24 hours). However, further progress can be assumed with increasing reaction time. This enhancement of poly(lactic acid) molecular weight had a response corresponding to changes of both physico-chemical and thermal properties of the solid state postpolycondensation products. en
utb.faculty Faculty of Technology
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1002763
utb.identifier.rivid RIV/70883521:28110/12:43868024!RIV13-MSM-28110___
utb.identifier.rivid RIV/70883521:28610/12:43868024!RIV13-MSM-28610___
utb.identifier.obdid 43868115
utb.identifier.scopus 2-s2.0-84860740748
utb.identifier.wok 000300600100007
utb.source j-wok
dc.date.accessioned 2012-03-30T12:13:09Z
dc.date.available 2012-03-30T12:13:09Z
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Kucharczyk, Pavel
utb.contributor.internalauthor Sedlařík, Vladimír
utb.contributor.internalauthor Sáha, Petr
utb.fulltext.affiliation Pavel Kucharczyk1, Vladimír Sedlařík1, Ita Junkar2, Darij Kreuh3, Petr Sáha1 1 Centre of Polymer Systems, Polymer Centre, Tomas Bata University in Zlin, nam. T. G. Masaryka 5555, 760 01 Zlin, Czech Republic 2 Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia 3 Ekliptik d.o.o., Teslova 30, 1000 Ljubljana, Slovenia sedlarik@ft.utb.cz
utb.fulltext.dates Prejem rokopisa – received: 2011-06-05; sprejem za objavo – accepted for publication: 2011-07-18
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utb.fulltext.sponsorship This research was financially supported by the Ministry of Education, Youth and Sports of the Czech Republic (project No. 2B08071 and ME09072) and Operational Program Research and Development for Innovations co-funded by the European Regional Development Fund (ERDF, project No. CZ.1.05/2.1.00/03.0111).
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