Our latest work on biobased poly(ester amides) with the title "A Facile Method to Synthesize Semicrystalline Poly(ester amide)s from 2,5-Furandicarboxylic Acid, 1,10-Decanediol, and Crystallizable Amido Diols" was recently published in ACS Sustainable Chemistry & Engineering. The study was conducted in the context of the MSc thesis of Andreas Magaziotis, in collaboration with Dr Tobias Robert and MSc Marcel Kluge of the Fraunhofer Institute for Wood Research WKI.
Abstract
The synthesis of polyamides and poly(ester amide)s derived from 2,5-furandicarboxylic acid frequently leads to amorphous polymeric materials. Formation of intramolecular hydrogen bonds between the oxygen heteroatom in the furan ring and hydrogens of the amide bonds reduces the intermolecular hydrogen bonds that are usually responsible for the high thermal and mechanical performance of these materials. To circumvent this problem, aliphatic–aromatic poly(ester amide)s were synthesized in this study from dimethyl 2,5-furandicarboxylate, 1,10-decanediol, and a preformed aliphatic diol containing two internal amide bonds (amido diol). Wide-angle X-ray diffraction and differential scanning calorimetry experiments revealed that polymers obtained were semicrystalline over the whole composition range and crystallized rapidly from the molten state, indicating that intramolecular H-bonding is effectively suppressed. Depending on the ratio of 1,10-decanediol and amido diol, the thermal properties could be adjusted over a wide temperature range. The polymers exhibit Tg and Tm in a range of −4 to 27 °C and 102 to 175 °C, respectively. Elastic modulus and hardness increased almost linearly with the amount of ester–amide moieties. The method presented herein allows for the successful synthesis of semicrystalline poly(ester amide)s from 2,5-furandicarboxylic acid without undesired intramolecular hydrogen bonds. This finding could set the stage for further bio-based poly(ester amide)s from 2,5-furandicarboxylic acid suitable for high-performance applications.
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