Journal of Applied Polymer Science, 117, 33, 2010

Synthesis and Gas Permeation Properties of a Single Layer PDMS Membrane



Cellulose acetate (CA) is highly comparable

hemodialysis process. In this work, asymmetric CA membranes

were synthesized with the phase-inversion method.

CA with a molecular weight of 52,000, poly(ethylene glycol)

(PEG) with a molecular weight of 400, and 1-methyl-

2-pyrrolidone (NMP) were used as the polymer, additive,

and solvent, respectively. The effects of the CA and PEG

concentrations and coagulation bath temperature (CBT) on

the morphology, pure water permeability (PWP), insulin/

human serum albumin (HSA) transmission, and finally

thermal and chemical stability of the prepared membranes

were determined and investigated. In general, increasing

the PEG concentration and CBT and reducing the CA concentration

resulted in increased PWP and insulin/HSA

transmission. Also, these variations facilitated the formation

of macrovoids in the membrane sublayer. On the

other hand, increasing the PEG and CA concentrations

and reducing CBT resulted in increased thermal and

chemical stability of the prepared membranes. Also, ratios

of 15.5/10/74.5 and 17.5/10/72.5 (w/w) for the CA/PEG/

NMP casting solutions and their immersion into coagulation

baths with CBTs of 0 and 25

in the preparation of membranes that had not only optimum

sieving properties and higher PWP but also thermal

and chemical stability better than that of conventional CA

hemodialysis membranes. to other synthetic polymer materials and is effective in the  

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