Permeability of small molecules through vapor deposited polymer membranes

Tufani, Ali and Özaydın İnce, Gözde (2015) Permeability of small molecules through vapor deposited polymer membranes. Journal of Applied Polymer Science, 132 (34). ISSN 0021-8995 (Print) 1097-4628 (Online)

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Free-standing, thin films of poly(2-hydroxyethyl methacrylate), p(HEMA), membranes deposited by initiated chemical vapor deposition (iCVD) technique are presented. Systematic studies of permeation of model dye molecules through these free-standing thin films are performed and effects of process parameters on the permeability and selectivity of the membranes synthesized using an all-dry process are demonstrated for the first time. Permeation studies of model dye molecules show that the diffusion of large dye molecules through the membrane is faster than the smaller dye molecules, due to loss of conformation entropy. Mesh sizes of the membranes are controlled by tuning the crosslink ratio of the polymer and diffusion coefficients of alizarin yellow model dye molecules are obtained as 0.44 x 10(-7) and 1.71 x 10(-7) cm(2)/s for high and low crosslinked membranes, respectively. Selectivity of the membranes is also demonstrated by the permeation studies of dyes with similar sizes but different polarities and the permeability coefficient of the hydrophilic dye is observed to be 30 times larger than that of the hydrophobic dye of similar size.
Item Type: Article
Additional Information: Article Number: 42453
Uncontrolled Keywords: hydrophilic polymers; membranes; radical polymerization
Subjects: Q Science > QD Chemistry > QD241-441 Organic chemistry
T Technology > TP Chemical technology > TP1080 Polymers and polymer manufacture
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Gözde Özaydın İnce
Date Deposited: 25 Aug 2015 11:46
Last Modified: 02 Aug 2019 16:24

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