Abstract: A series of poly（lactic acid） （PLA）/plasticized poly（vinyl alcohol） （CPVA） blends were prepared through melt mixing at different mass ratios of PLA to CPVA， and PLA/CPVA open-cell foams were prepared by using batch foaming and particle leaching methods with supercritical CO2 as a physical foaming agent. The results indicated that the crystallization temperature of PLA decreased significantly with an increase in the CPVA content， and its crystallinity increased at first and then decreased. Moreover， the melt viscoelasticity of the blends was improved. The volume expansion ratio （VER） of the open-cell foams decreased at first and then gradually increased with an increase in the CPVA content. Their open-cell content also increased. When the CPVA content reached 50 wt%， the VER of the open-cell foams was 23.1 times and their open-cell content reached 91.6 %.

Key words: poly（lactic acid）, poly（vinyl alcohol）, supercritical CO2, blends, open-cell foam