分子吸附对聚乙烯醇在氧化铝粉末压缩体中扩散系数的影响

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利用氧化铝粉末压缩球状体和Fick第二扩散定律,系统地研究了聚乙烯醇在多孔介质和实验系统pH值为8.40±0.2条件下的扩散行为,以及聚乙烯醇在球体外表面吸附对扩散系数的影响.实验结果和相应计算得到的扩散系数表明:发生在氧化铝表面的分子吸附,不仅导致扩散平衡状态时的Mt(聚乙烯醇在时间t的扩散量)高于理论计算值M∞,而且使实验初始阶段计算的扩散系数远大于其它过程扩散系数.由分子吸附产生的实验误差和扩散系数计算误差,可通过修正浓度分配系数K,或者直接从Mt中去除可能存在的吸附量得到解决.
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