Rheological Behavior and Morphologies of Reactively Compatibilized PVDF/TPU Blends

摘要

Using the comb copolymer PVDF-g-AAc as a compatibilizer, five reactively compatibilized PVDF/TPU blends with different compositions were prepared. During melt blending, the carboxylic acid groups of PVDF-g-AAc react with the urethane linkages of TPU to generate the graft copolymers PVDF-g-AAc-g-TPU, which lead to compatibilization of the PVDF/TPU blends. The rheological behavior of the compatibilized PVDF/TPU blends can be described by a generalized Zener model. PVDF/TPU 50/50 and PVDF/TPU 30/70 blends show a particle network structure, indicating elastic interactions between the grafted shells of compatibilized PVDF domains. SEM shows that almost all compatibilized PVDF/TPU blends exhibit a dispersion-type morphology.