Abstract
AbstractIn an attempt to develop direct methanol fuel cell (DMFC) membrane with low methanol permeability, we synthesized successfully poly(vinyl phosphate‐ b‐styrene) copolymers from poly(vinyl alcohol‐b‐styrene) by reaction with phosphorus oxychloride and subsequent hydrolysis. We obtained the ratio of the differently bound phosphorus by 31P Solid‐state NMR Spectroscopy because the majority of block copolymer is not soluble or does not make homogeneous solution in a NMR solvent. The total amount of acid groups as well as the ratio of singly and doubly bound phosphorus by 31P Solid‐state NMR and pH titration was slightly different due to the cross‐linked nature of the sample. Therefore, solid‐state NMR spectroscopy is the most powerful technique to characterize cross‐linked polymers like DMFC membrane.
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