Thermodynamic Modeling of PES/CA Blend Membrane Preparation

International Review of Biophysical Chemistry Pub Date : 2012-10-31 DOI:10.15866/IREBIC.V3I5.1569

H. Abdallah, S. S. Ali

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引用次数: 6

Abstract

Thermodynamic behavior of quaternary system with one low molecular weight component; N –Methylpyrrolidone (NMP) as a solvent, non-solvent; polyethylene glycol (PEG 400) and two high molecular weight polymers; polyethersulfone (PES) and cellulose acetate (CA) was investigated. An extended modified Flory-Huggins model was used. The predicted results from model of critical temperature for superiority properties of polymer blend solution were in range between UCST 323 K and LCST 350 K. However, the increasing the vaporization time of PES/CA blend membrane to 30 min has increased the heat of vaporization to 133659.6 J/mole which led to increase in cohesive energy density to 1311.82 J/cm3 and gained more solvent evaporation. The diffusion model was studied on the immersion precipitation process which was indicated that solvent and non-solvent volume fractions increased with time in the coagulation bath , while the polymer solution volume fraction decreased due to solvent and non-solvent removal from polymer solution and blend membrane formation. The predicted results from model of heat treatment process on blend membrane were indicated that increasing in membrane thickness and formation of dense layer in blend membrane

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PES/CA共混膜制备的热力学模型

单低分子量四元体系的热力学行为N -甲基吡咯烷酮(NMP)作为溶剂，非溶剂;聚乙二醇(peg400)和两种高分子量聚合物;对聚醚砜(PES)和醋酸纤维素(CA)进行了研究。采用了一种扩展的修正Flory-Huggins模型。聚合物共混液的优越性能的临界温度模型的预测结果在UCST 323k和LCST 350k之间。而将PES/CA共混膜的汽化时间延长至30 min，汽化热增加至133659.6 J/mol，内聚能密度增加至1311.82 J/cm3，溶剂蒸发量增加。浸没沉淀过程的扩散模型研究表明，混凝浴中溶剂和非溶剂体积分数随着时间的增加而增加，而聚合物溶液体积分数由于溶剂和非溶剂从聚合物溶液中去除和共混膜的形成而降低。由共混膜热处理过程模型的预测结果表明，共混膜热处理过程中膜厚增加，形成致密层

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International Review of Biophysical Chemistry

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