کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5186174 | 1381097 | 2009 | 11 صفحه PDF | دانلود رایگان |
Sulfonated multiblock copolynaphthalimides (co-SPIs) with block length of 5-20 were prepared by a two-pot polymerization method from 1,4,5,8-naphthalenetetracarboxylic dianhydride, sulfonated diamines of 2,2â²-bis(4-sulfophenoxy)benzidine (BSPOB) and 4,4â²-bis(4-aminophenoxy)biphenyl-3,3â²-disulfonic acid (BAPBDS) and nonsulfonated diamines. The scanning transmission electron microscopy showed that the BSPOB-based multiblock co-SPI membranes had well-defined microphase-separated structure where the hydrophilic and hydrophobic layer-like domains were oriented in the plane direction of membrane. On the other hand, the BAPBDS-based multiblock co-SPIs and all the random co-SPIs showed the homogeneous morphology. The water uptake, anisotropic membrane swelling, anisotropic proton conductivity and polymer electrolyte fuel cell (PEFC) performance were investigated for the multiblock and random co-SPIs. The results demonstrated strong effects of the membrane morphology on these properties. The BSPOB-based multiblock co-SPI membranes exhibited the larger through-plane swelling and the lower through-plane conductivity than the random ones, and as a result exhibited the lower PEFC performances. This study gives good understanding of the morphology-property relationship in novel block architectures' design.
Journal: Polymer - Volume 50, Issue 13, 19 June 2009, Pages 2933-2943