POS9-0199
Diacid-Encoded Molecular Interactions in Bio-Based Poly(urethane-amide) Elastomers: Linking Hard-Segment Structure to Mechanical Performance
Topic
S9. Polymer Technology for Sustainability
When and Where
Sep 30, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Heesuk KIM
Jinhye BAE
Presenter(s)
Giyeon Jeong (Sogang University)
Co-Author(s)
Abstract
Bio-based dicarboxylic acids offer a promising route for designing sustainable thermoplastic polyurethane-amide elastomers, but the influence of subtle diacid structures on molecular interactions and mechanical performance remains unclear. Herein, a series of Acidz-derived TPUz elastomers were synthesized from PTMEG, IPDI, and four structurally distinct diacids, including itaconic acid, fumaric acid, mesaconic acid, and succinic acid. The resulting PIAG, PFAG, PMAG, and PSAG were systematically investigated to clarify how unsaturation, geometric configuration, and pendant substitution regulate hard-segment association, hydrogen bonding, and segmental mobility. All TPUz exhibited predominantly amorphous characteristics, indicating that their mechanical responses were mainly governed by noncovalent interactions rather than crystallization. Among them, PIAG showed the most favorable mechanical and viscoelastic behavior, which was attributed to enhanced molecular polarization and stronger intermolecular association induced by the itaconic acid-derived structure. Combined spectroscopic, rheological, thermal, and computational analyses revealed a clear structure–interaction–property relationship across the TPUz series. This study demonstrates that diacid-derived hard segments can serve as active molecular regulators for tuning the performance of bio-based polyurethane-amide elastomers.
