Fourier transform infrared and selectivity measurements on polymeric gas separation membranes. Structure driven design of new materials
✍ Scribed by H. Ancelin; J. Yarwood; A.J. Willatt; J.H. Clint
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 424 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0924-2031
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✦ Synopsis
Infrared measurements of the solvation and conversion of Langmuir-Blodgett (LB) films of polyamic acid salts have been correlated with CO2/N2 selectivity measurements for gas separation membranes coated with the same LB multilayers. It has been shown that chemical structure and molecular ordering are important in controlling both the selectivity of such structures and their behaviour with a solvent (such as methanol) and with temperature. In particular, it is found that (for the salts) highly orientated alkyl chains give better selectivity. Furthermore, poor packing ability of the polyimide back-bone (due to a disruptive chemical structure) leads to relatively low selectivity. Such data may be employed to design chemical structures with enhanced functional behaviour.