Effect of Carbon‐Based Nanofillers with Different Geometries on the Crystallization Behavior and Molecular Dynamics of Poly(Butylene Furanoate) (PBF)

ABSTRACT The development of sustainable, high‐performance polymers has garnered significant attention in recent years. Poly(butylene furanoate) (PBF) is a bio‐based polyester derived from renewable resources that presents a viable substitute for conventional petrochemical polymers. However, its crystallization behavior and overall properties can be further enhanced with the addition of nanofillers. This work investigates how carbon‐based nanofillers with distinct geometries, namely 1D carbon nanotubes (CNT)s and 2D graphene oxide (GO), influence the crystallization behavior and molecular dynamics of poly(butylene furanoate) (PBF). Differential scanning calorimetry (DSC) and Ozawa analysis were employed to study non‐isothermal crystallization kinetics, while dielectric relaxation spectroscopy (DRS) mapped local and segmental molecular dynamics. Structural and thermal analyses confirmed that both nanofillers efficiently act as nucleating agents, accelerating crystallization, with CNTs showing a more pronounced effect. These insights highlight the critical role of nanofiller geometry in tuning crystallization mechanisms and molecular mobility of PBF, opening the door for its application in advanced, sustainable materials.