Cellulose Acetate Butyrate를 블렌드하여 개질한 생분해성 Polylactic Acid 발포체

Abstract

The expanded polystyrene foams, often termed Styrofoam, are not biodegradableand susceptible to photo-oxidation in the ocean contributing to microplastic marinedebris, resulting in a global ban as a single use plastic. As an eco-friendly polymer foam,Poly(lactic acid) and PLA/cellulose acetate butyrate (CAB) blends were foamed using antwin-screw extruder with azodicarbonamide (ADCA) as a chemical blowing agent. Whencellulose acetate butyrate (CAB) was blended to modify the low melt strength of PLA, thePLA/CAB blend showed outstanding miscibility indicated by the loss of each melting peakssuggesting the amorphous nature of the blends. The foam density of PLA blend decreasedfrom 1.20 g/cm3 to 0.63 g/cm3 with increasing CAB concentration at the adjusted ADCAconcentration and extrusion temperature. The CAB blending ratio of 50:50 with 2% ADCAmay enhance the foaming capability of PLA through the stabilization of the foam cell structuresboth by increasing melt viscosity and miscibility, as well as by the higher nonpolarsurface energy of CAB compared to PLA