Meridional scattering streak

Neutron scattering investigations have been extended from isotropic polymers to oriented systems. Sadler and Odell measured the scattering from two samples of polyethylene, one of which had been extruded and the other pressure-crystallized onto previously extruded fibres. The pressure-crystallized sample was isotropic unlike the extruded sample, which was found to be highly anisotropic. The authors derived a lower limit for the length of the extruded polymer molecule of 3 x 10 A from the width of the meridional streak, although no data analysis was given. 

Voids Size and distribution Height (length) when voids are elongated Misoiientation Characteristics of the decay in central diffuse scattering Width of the diffuse scattering along the meridian extrapolated from a series of meridional shces Azimuthal intensity distribution of diffuse streak... 

FIGURE 5 Low-to-medium-Q scattering pattern of a nematic side-chain polymer aligned in the magnetic field (field axis vertical). The pattern features a strong diffuse equatorial arc and a weak diffuse meridional streak, both attributed to intermolecular interference. 

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