Precise Active Chain Segment Strategy for Synthesizing Biobased Furan Polyamide with Controllable Sequence Structure and Good Comprehensive Properties

Preparation of biobased furan polyamides with good comprehensive properties remains a big challenge due to the instability of biobased furan monomers and the inactivation of reactive end groups. To address this issue, this study designs a precise active chain segment strategy to synthesize biobased furan polyamides with controllable sequence structures and excellent comprehensive properties. A series of biobased furan polyamides (PA(6F6) m 6) with furan ring content ranging from 20 to 50 wt % were prepared using dimethyl furan-2,5-dicarboxylate, 1,6-hexamethylenediamine, and adipic acid, featuring controllable alternating structure and adjustable performance. The resulting PA(6F6) m 6 demonstrates amorphous structure with number-average molecular weight ranging from 18,400 to 18,900 g/mol. More importantly, T d-5% and T d-max could reach up to 388 and 450 °C, respectively, with a yield strength of 74 MPa, breaking strength of 67 MPa, and elongation at break of 296%. Also notably, PA(6F6) m 6 possesses remarkably excellent gas barrier properties for both O 2 and CO 2 . This work provides a simple, efficient, and environmentally friendly method to develop high-performance furan polyamides with significant application potential.