| Popis: |
6,6-Nylon has been polymerized using d 8 -adipic acid. For a regular fold surface, the interior of the d 8 -6,6-nylon crystals then involves a regular alternation of regions with high and low scattering length density. Neutron diffraction data obtained at wavelengths of 4.7 and 2.35 A ∗ show slight shifts in the 001 peak position with a change in swelling agent from butane, 1,4-diol to the d 8 -analogue. On the basis of calculated diffraction intensities these shifts are shown to be consistent with a majority of acid-type folds in the single crystals, a feature consistent with earlier X-ray data. The proportion of acid-type folds is estimated to be 0.58. |
