Kettensteife Polymere – Struktur, Phasenverhalten und Eigenschaften

Structure of amorphous poly-(ethylmethacrylate): A wide-angle x-ray scattering study

“…Layer structures are a frequently observed ordering principle for stiff macromolecules with flexible side chains, 9 and are described in detail in Refs. 12 or 41.…”

“…7,8 A well-established case of local structure is exhibited by polymers with rigid backbones and flexible side chains ͑hairy rods͒. 9 In bulk they form layers where the rigid backbones self-assemble in ordered or disordered sheets separated by alkyl layers. A similar tendency toward layer formation might be expected for poly͑n-alkylmethacrylate͒ polymers because of the different polarity and flexibility of the main chain and the side groups.…”

Liquid Crystalline Phases from Polymer‐Functionalized TiO2 Nanorods

“…[3] These topics overlap in the area of lyotropic liquid crystals. [4][5][6] An additional benefit of LCs is that they allow the orientation of anisotropic nanometer-scale objects.…”

“…[17] Therefore, the concept of "hairy" rods, which was originally developed for stiff main-chain LCs, is promising. [4] In this model, a stiff insoluble core is solubilized by long alkyl chains (the hairs) on its surface. The applicability of this concept has already been demonstrated for anisotropic nanoparticles.…”

“…[9] First, experiments with the dispersions showed that birefringent domains (probably nematic) appear during solvent evaporation (increase of concentration), which can be oriented by shearing forces. Such birefringent regions are typical for lyotropic phases of rodlike particles, [4,5] which phase separate into an LC phase rich in anisotropic objects, and an isotropic phase lacking in anisotropic objects. [8] The evaporation speed of the solvents (THF or CHCl 3 ), however, did not allow a more quantitative characterization of the phase behavior.…”