2025/12/15 by Natsuki Kawabata, Naoki Asakawa, Teruo Kanki · 1 voice
Physics and Astronomy · Chemistry · Materials Science · #NMR spectroscopy and applications #Advanced NMR Techniques and Applications #Material Dynamics and Properties
paper · pdf · doi:10.5194/mr-6-317-2025
openalex created_date 2025/12/15 · openalex publication_date 2025/12/15 · openalex updated_date 2026/08/01
Understanding spatially heterogeneous molecular diffusion in semicrystalline polymers is critical for elucidating interfacial dynamics in soft materials. This study employs static-gradient nuclear magnetic resonance (NMR) imaging to capture the depth-resolved translational motion of polymer chains in a polytetrafluoroethylene (PTFE) film. By focusing on spin-spin relaxation behavior in amorphous regions near crystalline lamellae, we identify multiple diffusion regimes consistent with Bloch-Torrey analysis. The results reveal that molecular mobility at the substrate interface of PTFE film, immobilized on a glass substrate using epoxy resin, is significantly constrained, likely due to interfacial pinning, while the air-side surface shows signs of enhanced mobility. Our findings highlight the utility of static-gradient field NMR for probing nanoscale dynamical heterogeneity in semicrystalline systems.