Hydrogen production using water electrolysers equipped with an anion exchange membrane, a pure water feed and cheap components (catalysts and bipolar plates) can challenge proton exchange membrane electrolysis systems as the state of the art.

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Triblock copolymers were prepared from L-lactide and a poly(ethy1ene glycol) of a,, = 1020.With GeO, and SnO, only low conversions were obtained, regardless of the reaction temperature. Sb,O, caused partial racemization, and only SnO gave satisfactory results. When other samples of poly(ethy1ene glycol) were used (e. g., with Hn = 600 or 3 250), partial racemization occurred even with SnO. However, with Sn(I1) 2-ethylhexanoate, racemization-free triblock copolymers were obtained under the reaction conditions used. The results of the characterization indicate that the triblock copolymers possess unimodal molecular weight distribution. The lactide blocks crystallize in the a-modification and suppress in most, but not all, cases the crystallization of the poly(ethy1ene glycol) blocks. The crystallization of long poly(ethy1ene glycol) blocks observed in several cases indicates a triphasic character of these samples.

SUMMARY In-situ attenuated total reflection (ATR)-FTIR spectroscopy was used to monitor the consecutively alternating adsorption of polyethylenimine (PEI) and poly(acry1ic acid) (PAC) onto both Si crystals (SiO) and COz plasma-treated polypropylene (PP) films. The vibration bands v,(COO-) and v(C=O) of PAC are diagnostic for the polyelectrolyte layer build-up and sensitive to protonation changes. Human serum albumine (HSA) adsorption experiments revealed a strong decrease of fouling for the PP films, which were modified with polyelectrolyte multilayers, in comparison to the unmodified ones.

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