The heating of a levulinic acid and pentaerythritol 4:3 mixture with Sb2O3 catalyst at 23–210 °C gives poly(levulinic acid–pentaerythritol). This all renewable carbon based moldable white thermoplastic is shown to contain a structure with ester and ketal links.
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Amarasekara et al. (2018) studied this question.
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