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Comparison of (a) cell density and (b) expansion ratio of foams obtained at various die temperatures with 5 and 9 wt% CO2 from neat PLA (PLA0) and PLA with 1 wt% (PLACN1) and 5 wt% (PLACN5) of Cloisite 30. Reprinted from Keshtkar et al. [151]. Copyright (2020), with permission from Elsevier.
