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Barrier films made with various lamellar block copolymers

机译:由各种层状嵌段共聚物制成的阻隔膜

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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.
机译:氦,氮和氧在层状嵌段共聚物中的渗透率可以根据玻璃状和橡胶状嵌段的性质准确估算。测试的共聚物包括聚(苯乙烯-b-异戊二烯-b-苯乙烯),聚(苯乙烯-b-丁二烯-b-苯乙烯)和聚(丙交酯-b-异戊二烯-b-丙交酯)。结果表明,势垒性能的改善往往大于串联电阻的预期值。这些增加并不像使用云母和粘土之类的不渗透性填料获得的增加那么大。还讨论了由玻璃状薄片引起的薄膜弹性模量的变化。

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