Publications Repository - Gdańsk University of Technology

Here we present a novel series of biobasedpolyesters solely based on renewable isohexide building blocks,synthesized via melt polymerization. The recently developedisoidide dicarboxylic acid (IIDCA) was polymerized with rigidrenewable diols such as isosorbide (IS), isomannide (IM),isoidide (II), and the novel 2,5-methylene-extended isoididedimethanol (IIDML). Both IIDCA and IIDML weredeveloped to increase the reactivity of the isohexide buildingblock, while retaining rigidity and hence the beneficial effectson Tg. Compared to the parent isohexides, IIDML showed amarkedly higher reactivity, resulting in three to four timeshigher weight-average molecular weight (Mw) values of thesynthesized polyesters. The molecular structure of the novel polyesters was analyzed by 1H, 13C and 2D-COSY NMR techniques,confirming that the stereoconfigurations of the isohexide moieties were preserved under the applied polymerization conditions.The II/IS-based polyesters have high Tg values noted of 70 and 85 °C, respectively, while the IIDML-based polyester has a lowerTg of approximately 45 °C, yet with an higher degree of crystallinity than the parent isohexide-based polyesters. A systematicstudy on structure-thermal properties relations comparing these novel polyesters with, e.g., aliphatic polyesters reveals that, whenincorporated into polyesters, both IIDCA and IIDML are able to increase the Tg by approximately 70 °C, which is comparable tothe parent isohexides. Given the enhanced reactivity, high thermal stability and the retained ability to increase the Tg, IIDML is apromising renewable building block for performance polymers.

Authors

• Jing Wu,
• Pieter Eduard,
• dr hab. inż. Lidia Jasińska-Walc link open in new tab ,
• Artur Różański,
• Bart A. J. Noordover,
• Daan S. Van Es,
• Cor E. Koning