MASS-TRANSFER AND THERMODYNAMICS DURING IMMERSION PRECIPITATION FOR A 2-POLYMER SYSTEM - EVALUATION WITH THE SYSTEM PES-PVP-NMP-WATER
MASS-TRANSFER AND THERMODYNAMICS DURING IMMERSION PRECIPITATION FOR A 2-POLYMER SYSTEM - EVALUATION WITH THE SYSTEM PES-PVP-NMP-WATER
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DOI：
10.1016/0376-7388(94)80074-x
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发表时间：
1994-05-04
影响因子：
9.5
通讯作者：
SMOLDERS, CA
中科院分区：
文献类型：
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作者：
BOOM, RM;VANDENBOOMGAARD, T;SMOLDERS, CA
鲁弗斯等人的传质模型的扩展版本。对四组分系统进行了评估，结果表明该方法在短时间内是有效的。对这些情况下的热力学进行了评价，并对动力学进行了分析。计算初始组成路径(浓度分布)。当使用可溶于非溶剂的聚合物添加剂时，脱混的延迟似乎是不可能的，但脱混的速度降低。在聚合物溶液和凝固浴的广泛组成范围内，通过浸没沉淀过程中光透过率的测量，对聚醚sulfone)-poly(vinylpyrrolidone)-N-methylpyrrolidone-water体系的计算进行了评估。
An extended version of the mass transfer model by Reuvers et al. for a four-component system is evaluated, which is shown to be generally valid for short times. The thermodynamics under these circumstances are evaluated, together with the kinetics. Initial composition paths (concentration profiles) are calculated. It appears that delay of demixing is not possible when a polymeric additive is used, which is soluble in the nonsolvent, while the velocity of demixing decreases. The calculations are evaluated for the system poly(ether sulfone)-poly(vinylpyrrolidone)-N-methylpyrrolidone-water by means of light transmission measurements during immersion precipitation, for a wide range of compositions of the polymer solution and coagulation bath.