Pervaporation through structurally unstable polymeric membranes

According to the nature of interaction of polyethylene terephthalate (PET) with binary solutions two groups of systems have been identified. Those belonging to group A are aqueous solutions of acetone and dioxane, as well as acetone solutions of isopropanol. Systems belonging to group B are: acetone...

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Bibliographic Details
Published in:Journal of membrane science 1992-03, Vol.67 (2), p.167-175
Main Authors: Ageev, Ye.P., Matushkina, N.N., Strusovskaya, N.L.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
liquid permeability and separations
Membranes
microporous and porous membranes
organic separations
pervaporation
structural change
water sorption and diffusion
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Summary:According to the nature of interaction of polyethylene terephthalate (PET) with binary solutions two groups of systems have been identified. Those belonging to group A are aqueous solutions of acetone and dioxane, as well as acetone solutions of isopropanol. Systems belonging to group B are: acetonecarbon tetrachloride, dioxanecarbon tetrachloride and dioxanehexane. They are characterized by a positive deviation of swelling from additivity and a smooth trend of the crystallinity and permeability curves. The treatment of PET films with group A solutions is a simple method of modifying the polymer structure, leading to an increase in its permeability. Preliminary biaxial orientation of PET renders it suitable for use in the separation of liquids which crystallize an unoriented polymer so strongly that it loses its mechanical strength.
ISSN:0376-7388
1873-3123
DOI:10.1016/0376-7388(92)80023-D