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Preparation of Biodegradable Poly(lactic acid)-Cellulose Composite Foam

In this study, a cellulose foam was formed by the melt crystallization method of cellulose (FP) solution, and poly(lactic acid) (PLA) solution was then infiltrated into the foam to prepare a PLA/FP composite foam. When PLA is infiltrated into the cellulose porous material with a hydrophilic surface, the surface is transformed into a hydrophobic one. The PLA/FP composite foam showed a higher density and improved mechanical properties than the FP foam. In terms of porosity, the FP foam showed a higher value than the PLA/FP composite foam, but the PLA/FP composite foam had better thermal insulation properties as seen in through-plane thermal conductivity. Thermal stability at a high temperature was better for the PLA/FP composite foam than for the FP foam. Due to its high mechanical properties and thermal stability, the PLA/FP composite foams are expected to have the potential as insulation and cushioning materials in the future.