Global orientational order parameter

These studies have also shown that the PDMS chains become elongated and ordered as a function of applied tension [26]. Since monomer alignment on the surface of the cavity may have significant effect on the PDMS/filler system upon extension, we investigate the evolution of the global orientational order parameter, p2y, for the melt and particles that belong to the cavity ... 

Unoriented poly (p-hydroxybenzoic acid-co-2,6-hydroxynaphthoic acid) exhibited smoothly wandering director fields in three dimensions. Alignment with a 1.1 T magnetic field for 30 min at 300 C transformed this structure to domains with an anisotropic shape within which the polymer was highly oriented, and the global order parameter amounted to 0.85 [110]. Boundaries were of the splay-bend type and involved a 180 director rotation. At lower field strengths, the domains were less... 

Figures 9 and iO show the results from one experiment on PPC deep in the thermotropic phase at 65°C. A steady state shear flow of 2.5s is applied and the level of global preferred orientation is evaluated from a series of x-ray scattering patterns recorded with a cycle time of 15s over a period of 1000s. Using the azimuthual variation of intensity of the diffuse peak at IQI 0.4 A , values of the global orientation parameters mtd are obtained as a function of time. A value of , = 0 indicates a completely isotr opic state, while . = I indicates a fully aligned system. A nematic liquid crystal systems exhibits microscopic order...

This expression takes account of the fact that clusters with a range of diffo-oit polar angles a contribute to the intensity scattered at the same y due to the difra-ait azimuthal orientation of their local directors around the global axis. In order to obtain D(a), EQN (18) can be inverted numerically [14]. If only the order parameter < 2> is required, the expression. 

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