 The study examined the effects of organically modified clay nanoparticles on the molecular relaxation behavior of a molten blend of polylactic acid, PLA, and polybutylene adipocotoreftalate, PBAT. The nanoparticles were added in varying concentrations and three mixing strategies were employed to control their localization within the blend. Small amplitude oscillatory shear, SAOS, and stress growth tests were conducted to determine how the nanoclays interacted with the polymer components and their influence on the molecular relaxation behavior. The results showed that the presence of the nanoparticles had a significant impact on the molecular relaxation behavior of the blend, particularly when they were localized in the PLA phase. This was attributed to the degradation of PLA, coalescing of PBAT droplets, and the resulting changes in the viscosity of the blend. This article was offered by Mnofa, M.C. Husey, P.J. Kao, and others.