Unraveling the cause for the unusual processing behavior of commercial partially bio‐based poly(butylene succinates) and their stabilization

The commercially available partially bio‐based poly(butylene succinate) (PBS) and poly(butylene succinate‐ co ‐adipate) (PBSA) are subjected to prolonged and multiple extrusion cycles to investigate their thermal behavior. Empirically, both PBS and PBSA form branches at 190°C, with PBS possessing a higher tendency for branching than PBSA as studied by rheology and size exclusion chromatography (SEC). In each case, the branching is favored by...