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基于非平衡现象的聚乳酸聚氧化乙烯复合材料梯度结构的自组织制备

, PP. 1409-1415

Keywords: 非平衡现象,梯度结构,相分离,自组织,聚合物共混

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Abstract:

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.

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