anisotropy

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anisotropy

 [an″i-sot´ro-pe]
the quality of being anisotropic.
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Following Hurion, Kundt in 1886 published two articles (Kundt 1886a; Kundt 1886b) that delved into the issues of optical anisotropy, which were relatively new at the time.
5d, when the composite is crystallized under [CO.sub.2] at low pressure in which the number density of spherulite N is larger than that under air at ambient pressure, the spherulite is coarser than that obtained under air at ambient pressure: that is, the arrangement of the lamellar stacks are much disordered and the optical anisotropy in the spherulite is weaker.
The interference pattern of the writing beams leads to a spatially modulated optical anisotropy of the phase type [DELTA]n([chi]) (refractive index modulation) and/or the amplitude type [DELTA][alpha]([chi]) (absorption modulation) and also, in the case of azobenezene functionalized polymers, to the surface modulation [DELTA]d([chi]).
The stress-optical behavior can be understood from the thermo-viscoelastic properties of polymers governing the qualitative behavior and the molecular design, which determines the sensitivity of a polymer to stress-induced optical anisotropy. The latter will be discussed in the next section, which gives arguments for the kind of molecular modifications that were made in the investigated polycarbonates.
They found that both PMDA/ODA and BPDA/PDA films possess significant optical anisotropy that should result in dielectric anisotropy.

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