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Barrier films made with various lamellar block copolymers |
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| Authors: | Junshan Wang Jonathan P. DeRocher Lifeng Wu Frank S. Bates E.L. Cussler |
| Affiliation: | aChemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, 421 Washington Avenue, S.E., Minneapolis, MN 55455, USA bJinxi Natural Gas Chemical Company, Huludao, Liaoning 125001, China |
| Abstract: | The permeabilities of helium, nitrogen, and oxygen across lamellar block copolymers can be accurately estimated from the properties of the glassy and rubbery blocks. The copolymers tested include poly(styrene-b-isoprene-b-styrene), poly(styrene-b-butadience-b-styrene), and poly(lactide-b-isoprene-b-lactide). The results show improvements in barrier properties that tend to be larger than those expected from the resistances of lamellae in series. These increases are not as large as those achieved with impermeable fillers like mica and clay. The changes in film elastic modulus caused by glassy lamellae are also discussed. |
| Keywords: | Barriers Block copolymers Diffusion Lamellae |
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