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  • Enhancement of molecular weight of L-lactic acid polycondensates under vacuum in solid state = Povečanje molekularne teže polikondenzatov L-laktične kisline v trdnem stanju z vakuumom
    Kucharczyk, Pavel ...
    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 wasused 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. Resultsshow significant enhancement of molecular weight in case of the systemscontaining 2 wt. % of the catalyst due to the postpolycondensation procedure (Mwč91.0 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.
    Source: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 46, št. 1, jan.-feb. 2012, str. 37-41)
    Type of material - article, component part
    Publish date - 2012
    Language - english
    COBISS.SI-ID - 29690841

    Link(s):

    Digitalna knjižnica Slovenije - dLib.si

source: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 46, št. 1, jan.-feb. 2012, str. 37-41)

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