Wellen, Renate M. R.

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Wellen, Renate M. R.
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Wellen, Renate
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    Item-typ:Veröffentlichung,
    Crystallization behavior of polycaprolactone/babassu compounds
    (Springer, 2020-03-02)
    Schäfer, Hannes
    ;
    Reul, Lizzia T. A.
    ;
    Souza, Fernanda M.
    ;
    Wellen, Renate M. R.
    ;
    Carvalho, Laura H.
    Polycaprolactone/babassu compounds were prepared in a laboratory internal mixer, their melt crystallization behavior was investigated using a differential scanning calorimeter, and their kinetics was correlated using the Pseudo-Avrami model, with cooling rates ranging from 2.5 to 15 °C min−1. Babassu filler did not affect significantly crystallization parameters, with maximum differences of 1.2 K in temperature and 3% in crystallinity, within experimental uncertainty. Regarding Pseudo-Avrami parameters, data were correlated for the interval 5–95% conversion, which seems to be appropriate for processing applications; the uncertainty associated with Pseudo-Avrami individual parameters is less than 1%, whereas the “rate parameter” K was found to be well represented by a quadratic function.
    Wissenschaftlicher Artikel
    Band:143
      41  20
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    Synthesis of bio-polyurethanes with isosorbide and propanediol based poly(lactic acid) diol
    (Wiley, 2023-01-17)
    dos Santos Silva, Ingridy Dayane
    ;
    Alburquerque, Ananda
    ;
    Boskamp, Laura
    ;
    Ries, Andreas
    ;
    Haag, Katharina
    Synthesis of bio-polyurethane (Bio-PU) using isosorbide (ISO) and poly(lactic acid) (PLA) diols, (propanediol based poly(lactic acid) (PLAP) and PLA esterified with Soybean oil (PLASO)) and pentamethylene (PDI) isocyanate were performed. Crosslinked Bio-PUs were obtained, and the details of the curing kinetics were determined via Fourier transform infrared spectroscopy (FTIR) spectra and differential scanning calorimetry (DSC). Distinct curing behaviors between Bio-PUs with different PLA diol formulations were observed. The addition of PLAP and PLASO increased the curing conversion at approximately 460% higher than Bio-PU without PLA content, as verified by FTIR. The curing peak temperature (Tp) of Bio-PUs with PLAP ranged from 94 to 163°C, while for PLASO Tp was 132–175°C. Bio-PUs based on PLA diols displayed lower activation energy (Ea) during curing as demonstrated using Friedman model, and higher thermal stability as evidenced through thermogravimetric analyses. Reported data offer reliable tools to evaluate the best rote to synthesize biobased polyurethane and manipulate the degree of crosslinking based on composition and processing conditions, allowing product processing to the desired application.
    Wissenschaftlicher Artikel
    Band:140
    Heft:11
      54  31