Jacco van Haveren

TL;DR: It is shown that the type of catalyst has a significant effect on the deoxygenation pathway, that is, group 10 metal catalysts are active in decarbonylation/decarboxylation whereas metal sulfide catalyststs are more selective to hydrode oxygengenation.

TL;DR: In this paper, a detailed differential scanning calorimetry study on the crystallization behavior of high molecular weight poly(ethylene 2,5-furanoate) allowed to calculate the equilibrium melting temperature of 239.3 and 239.7 °C for the first and second melting peak, respectively.

TL;DR: The SSP method resulted in much higher molecular weights and much less colored polymers, and it seems to be the preferred route for incorporating biobased monomers that exhibit limited thermal stability into engineering plastics.

TL;DR: Hydrogenated adducts from diene/dienophile combinations of (methylated) furans with maleic anhydride are efficiently converted into renewable aromatics with this new route and zeolite H‐Y was found to perform the best and can be easily reused after calcination.

Abstract: Isohexides, like e.g. isosorbide, are well-known carbohydrate-based rigid diols which are capable of dramatically increasing the glass transition temperature of polyesters. However, their relatively low reactivity has thus far hampered large-scale industrial applications in the polymer field. Recently, with the aim to increase reactivity while at the same time retain rigidity, we have developed a new isoidide dicarboxylic acid (IIDCA) by transforming the secondary hydroxyls into carboxylate functionalities. Here we report the first polymers based on IIDCA and linear α,ω-diols. The novel polyesters were obtained via melt polymerization and exhibited weight-average molecular weights in the range of 13 000–34 000 g/mol and polydispersities close to 2.0. NMR analyses showed that the exo–exo configuration of the isoidide dicarboxylate units was preserved during synthesis. Both differential scanning calorimetry and wide-angle X-ray diffraction analyses showed that the IIDCA polyesters are semicrystalline materi...