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- W2009295512 abstract "This work presents the effect of elastic anisotropy and disclination interaction on wedge disclinations in the nematic phase of thermotropic polymers, by combining experimental measurements, (this paper part I), with numerical simulation (part II [1 Song W Tu H Goldbeck-Wood G Windle A. H 2003 Liq, Cryst [Google Scholar]]). In part I, the decoration provided by spontaneous banded texture gives much information about the defect structure of polymeric nematics. Working with a semi-rigid polyester, the optical images of +1/2 disclinations revealed by banding enable the distortion to be determined as a function of polar coordinates from the cores. Continuum theory allows the apparent elastic anisotropy, ϵ , of bend and splay constants of the copolyester to be determined from the distortion measurement. The values of ϵ , are seen to vary greatly in the range −1 to +1 between different +1/2 disclinations in the same sample. The statistics of the measurement indicate that the distribution of the values of ϵ is random. The implication of these observations is that the curvature of wedge disclinations is affected not only by the elastic anisotropy of the material, but also by other factors. The possible reasons are discussed: the interaction of neighbouring disclinations has been numerically analysed to be the predominant factor in [1 Song W Tu H Goldbeck-Wood G Windle A. H 2003 Liq, Cryst [Google Scholar]]. This work also implies that values of the intrinsic elastic anisotropy obtained by measuring the distortion of individual wedge disclinations must be viewed with some circumspection." @default.
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- W2009295512 date "2003-07-01" @default.
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- W2009295512 title "Elastic constant anisotropy and disclination interaction in nematic polymers I. Apparent variation in anisotropy" @default.
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- W2009295512 doi "https://doi.org/10.1080/026782903100011469" @default.
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