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基于热力学非平衡现象,将聚乳酸(PLA)-聚氧化乙烯(PEO)-CHCl3溶液置于远离热力学平衡状态的开放系中干燥,自组织构筑了PLA-PEO复合体系内部的梯度相分离结构。通过偏光显微镜(POM)和衰减全反射傅里叶变换红外(ATR-FTIR)光谱对复合材料共混膜试样内部的梯度结构进行了表征。结果表明:在热力学非平衡状态下,复合体系内部形成了梯度结构;随着体系远离平衡状态,PLA富集在能量流出的空气侧,PEO则富集在能量流入的底部,膜的组成在能量流动方向上形成梯度分布,并随体系远离平衡状态呈增大的趋势,而热力学平衡状态是影响梯度结构形成的主要因素。
Based on the unbalanced thermodynamics, the PLA-PEO-CHCl3 solution was placed in an open system far away from the thermodynamic equilibrium and was self-organized to construct a gradient phase separation structure inside the PLA-PEO composite system. The gradient structure inside the composite membrane samples was characterized by POM and ATR-FTIR spectroscopy. The results show that the gradient structure is formed in the thermodynamic unbalanced state. As the system moves away from equilibrium, the PLA enriches on the air side where the energy flows out. The PEO is enriched in the bottom of the inflow of energy. The gradient distribution is formed in the flow direction and tends to increase as the system moves away from the equilibrium state. The thermodynamic equilibrium state is the main factor that influences the formation of the gradient structure.