Neutron scattering wide angle

Figure 5.6 Wide-angle neutron scattering profiles measured at the various temperatures for (c) DHDPE/LLDPE(2) and (d) DHDPE/LLDPE(3) blend samples in comparison with the profiles of (a) the amorphous state and (b) the crystalline state calculated for the pure DHDPE and the blend of D and H chain components. In (c), the low angle broad scattering is detected at any temperature due to the homogeneous mixing of D and H species in the same crystallite state as well as in the melt state. In (d), the low angle scattering can be seen only in the molten state, while it becomes lower when the sample crystallizes into the separated phases of D and H chains. These observations are consistent with the simulated results of (a) and (b).

Crist et al. (132) deuterated or protonated a slightly branched polybutadiene to produce a type of polyethylene. Blends of these two materials were used in SANS studies. The scattering curves indicated identical dimensions (Rg values) for both the melt and melt-crystallized materials these were the same as expected for Flory 0-solvent values for polyethylene. Using wide-angle neutron scattering, Wignall et al. (113) concluded that the number of stems that could be regularly folded had an upper limit of about four. 

Wide angle neutron scattering, commonly referred to as broad Q neutron diffraction, has been performed on various crystalline and amorphous polymers. Exploiting the contrast variation between isotopes as was done in SANS, the broad Q neutron scattering can be used to examine various scattering features. For example, neutron diffraction was performed on amorphous atactic polystyrene, which had selectively deuterated components. This allowed for the examination of... 

The objective of the worik reported herein was to assess the effect of the addition of SPS on the short-range order in PC. Short-range order was determined using wide angle neutron scattering with spin polarization analysis. 

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