Abstract
Grazing incidence X-ray reflection has been used to examine the structure of spread monolayers of poly(N-alkyl-4-vinylpyridinium bromide)s, denoted by PC n where n is the length of the alkyl aide chain, on water. Members of the series with even n from 8 to 22 were investigated, and the results for PC 18 are compared with those of neutron reflection on the same sample. The comparison of neutron and X-ray results on PC 18 makes it possible to identify those contributions to the X-ray reflectivity coming from the polymer backbone and alkyl chains for this particular polymer. On the basis of this comparison the thickness of the polymer layer has been estimated for each member of the series
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