中文摘要：

平衡吸着数量，解吸附作用散开系数和 CO2 在的吸着散开系数(l 乳的酸)(PLLA ) poly，在提高的压力的电影被 gravimetric 方法， Fick 的散开模型在被使用分析解吸附作用和吸着过程决定。在 PLLA 的 CO2 的平衡吸着数量与降低温度并且从 40 ～ 60 在温度范围提高压力增加了

英文摘要：

Equilibrium sorption amount, desorption diffusion coefficients and sorption diffusion coefficients of CO2 in poly（l-lactic acid） （PLLA） films at elevated pressures were determined by the gravimetric method, in which the Fick＇s diffusion model was applied to analyze both the desorption and sorption processes. The equilibrium sorption amount of CO2 in PLLA increased with lowering temperature and elevating pressure at the temperature range from 40 to 60 ℃ and pressure from 10^4 to 2x10^4 kPa. Desorption diffusion coefficients were greatly influenced by the equilibrium sorption amount, and they were in the same order of magnitude as the sorption diffusion coefficients. The scan electron microscope （SEM） photos demonstrated that there was no foaming phenomenon of the PLLA film during desorption and sorption processes. The XRD spectra implied that the crystalline degree of PLLA film decreased after CO2 processing. It was concluded that PLLA polymer could be well swollen and plasticized by supercritical CO2.