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Transport Properties of Fluorinated Polyimide/PMMA-g-Silica Nanocomposite Membrane  

Kwon, Yu-Mi (School of Chemical Engineering & Material Science, Chung-Ang University)
Im, Hyun-Gu (School of Chemical Engineering & Material Science, Chung-Ang University)
Kim, Joo-Heon (School of Chemical Engineering & Material Science, Chung-Ang University)
Publication Information
Polymer(Korea) / v.34, no.1, 2010 , pp. 1-7 More about this Journal
Abstract
To enhance the transport properties of gas separation membrane, we prepared 6FDA-6FpDA based polyimide membrane with PMMA-graft-silica nanoparticles. The silica was grafted PMMA which is miscible with 6FDA-based polyimide after surface treatment by 3-methacryloxypropyltrimethoxysilane ($\gamma$-MPS). The untreated silica/6FDA-6FpDA membrane showed greater permeability and less selectivity than PMMA-g-silica/6FDA-6FpDA due to its low dispersion. The transport properties of PMMA-g-silica/6FDA-GFpDA membrane were measured as a function of filler concentration. These membranes were evaluated using pure gases (He, $O_2$, $N_2$, $CO_2$). The increase in permeation was attributed to changes in the free volume distribution until 1 wt%. After 1 wt%, the permeability was decreased by excess silica which decreased effective area in polymer matrix. The selectivity was decreased with increasing permeability on the whole. However, the selectivity of $CO_2$ showed more enhance value.
Keywords
6FDA-6FpDA; PMMA; silica; dispersity; selectivity;
Citations & Related Records
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