Liquid Crystalline Polymers (1990) / Chapter Skim
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1 CONCLUSIONS AND RECOMMENDATIONS
1 CONCLUSIONS AND RECOMMENDATIONS
Pages 5-12
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MACROMOLECULAR DESIGN AND SYNTHESIS Thermotropic LCPs {Mainchain) Conclusions · Among the serious molecular design issues affecting copolyester syntheses are the elucidation and control of the mer sequence along the polymer backbone.
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Recommends Lions · Create opportunities that explo it novel functional s idechain LCPs via the interplay of function and chemical structure in these anisotropic systems, particularly in areas where their structural anisotropy and elastomeric and/or glassy mesophase formation can lead to new applications and enhanced performance, e.g., optical storage and wave guide media. · Encourage design and synthesis of sidechain LCPs for nonlinear optical properties in integrated programs of characterization and evaluation.
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Dvnamics Conclusion · Chain dynamics dominate both phase transitions and the development of structure during processing. Although there has been progress on the theory of diffusion and rheology of rigid-rod polymers in dilute and semidilute solutions, very little is known about these properties in liquid crystalline solutions and bulk polymers.
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PROCESSING Lvotropics Conclusion · The technology for the formation of highly oriented fibers from anisotropic polymers is well established, but fabrication processes for biaxially oriented films and other multiaxially oriented shapes are still under development. Process development appears to be feasible with existing commercial lyotropic LCPs (e.g.
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scenario is considered to be part of the application-imposed environment and, although some LCPs exhibit excellent barrier properties, exposure to CW liquids must be included in any screening protocol during materials selection and qualification. Recommendations (in addition to recommendations cited under Processing et al.)
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NONLINEAR OPTICAL PROPERTIES Conclusion · Liquid crystallinity in combination with the unique electronic properties that can be achieved in organic molecular solids and polymers may lead to useful polymeric materials for second- and third-order nonlinear optical applications. The advantageous property associated with liquid crystallinity is anisotropic order, which is either essential to or enhances nonlinear coefficients and imparts stability to the critical orientation of chromophores in the films.
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11 @ Supporc polymeric design, synthesis, and processing studies aimed at the unique properties of waveguide structures for third-order nonlinear on hi r~ @ Focus research support in polymer nonlinear optics on interdisciplinary programs Where molecular and polymer design and synthesis, waveguide design and fabrication, and physical characterization are combined.
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