Cellulose acetate -based PCLs

Polymer blends have been categorized as (1) compatible, exhibiting only a single Tg, (2) mechanically compatible, exhibiting the Tg values of each component but with superior mechanical properties, and (3) incompatible, exhibiting the unenhanced properties of phase-separated materials (8). Based on the mechanical properties, it has been suggested that PCL-cellulose acetate butyrate blends are compatible (8). Dynamic mechanical measurements of the Tg of PCL-polylactic acid blends indicate that the compatability may depend on the ratios employed (65). Both of these blends have been used to control the permeability of delivery systems (vide infra). 

PLA), polycaprolactone (PCL), aliphatic copolyesteis (poly(butylene succinate), poly(butylene succinate-co-adipate), poly(ethylene succinate)), aliphatic-aromatic copolyesters (poly(butylene adipate-co-terephthalate)), starch-based polymers, polyCvii rl alcohol), cellulose acetate. 

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