Morphological study of cellulose acetate membranes based on hydrophilic additives
Paper ID : 1332-MST2015-FULL
anahita homavand1, marzieh moghiseh1, Jalal Barzin *2
1Department of Biomaterials, Faculty of Science, Iran Polymer and Petrochemical Institute, P.O. Box: 14977/13115, Tehran, Iran
2Iran polymer and petrochemical Institute, Pazhoohesh Blvd, Km 15, Tehran- Karaj Hwy,Tehran, I.R. Iran .
Asymmetric cellulose acetate membranes commonly are produced by phase inversion method. A comparative study is presented on cellulose acetate (CA) flat sheet membranes prepared in the presence of hydrophilic additives such as Polyvinylpyrrolidone (PVP) and Polyethylene Glycol (PEG), using N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP) as different solvents; Also distilled water was used as non-solvent. In this research, effect of different molecular weight of PVP (PVPK25, PVPK30) and PEG (PEG400, PEG1500) on membrane structures were investigated. In a parallel work, the relation of additive concentrations i.e. PVP (10 wt. %, 12 wt. % and 14 wt. %) and PEG (15 wt. %, 20 wt. % and 25 wt. %) with membrane morphologies was investigated. Structure observation analyses were performed by scanning electron microscopy (SEM). The results show thatby increasing molecular weight of PVP, PEG and also additive concentrations, viscosity of the casting solutions increased somore spongy regions were observed. SEM cross sectional images show that casting solutions consist of PVP additives represented spongy morphologies from bottom to top of the membrane structures. Versus CA/PEG membranes have macro voids and finger-like structures.
Membrane, cellulose acetate, Morphology, hydrophilic additives, Molecular weight, concentration
Status : Paper Accepted (Poster Presentation)