Investigating rheological, morphological and mechanical properties of PBS/PBAT blends

A Boonprasertpoh, D Pentrakoon, J Junkasem


Morphological, rheological and mechanical properties of various biodegradable poly(butylene succinate) (PBS)/poly(butylene adipate-co-terephthalate) (PBAT) blends via conventional melt blending technique are studied. The morphology, rheology, and tensile properties of the PBS/PBAT blends were observed by scanning electron microscope (SEM), rotational rheometer, and universal testing machine, respectively. The SEM micrographs of the PBS/PBAT blends reveal an occurrence of phase separation indicating by a presence of spherical particles/cavities for a range of 10 to 30 wt% (i.e. PBS90-PBS70), and 70 to 90 wt% (i.e. PBS30-PBS10) PBT content and co-continuous structure for a range of 40 to 60 wt% (i.e. PBS60PBS40) PBAT content. The rheological observation reveals that storage modulus (G’), loss modulus (G’’), and complex viscosity (η*) for the PBS/PBAT lends exhibit similar tendency. The morphological properties of the blends appear to affect the tensile behavior of the PBS/PBAT blends.

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