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Showing 1 to 8 of 8 for “"plastic crystals"”.
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Theory of phase transitions in liquid crystals and plastic crystals
The properties of the layered, or smectic, liquid crystals are explained in terms of progressive freezing-out of rotational and translational degrees of freedom within each smectic plane. McMillan's dipole-dipole interaction model is extended to include intermolecular repulsions. In the …
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Elastic Constants of Plastic Crystals by Schaefer-Bergmann Scattering: Crystalline Cyclohexane and Deuteromethane
… this method for measuring elastic constants of plastic crystals are discussed. A method for determining both the elastic constants and the spacial orientation of the crystal from the light scattering data is presented.
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Elastic constants of plastic crystals by Schaefer-Bergmann scattering: Crystalline cyclohexane and deuteromethane
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T17:13:14Z No. of bitstreams: 1 1982_marx.pdf: 3952519 bytes, checksum: 870829b04b1b568f302ab0c89a1fc0c3 (MD5)
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Synthesis and Crystallization of Anisotropic Polymer Colloids
… behavior, with spherocylinders forming plastic crystals and orientationally ordered crystals in three dimensions, and dumbbells only ordering in two dimensions. However, it is more difficult to form colloidal crystals with both types of shape anisotropie particles than with spheres. …
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Deformation induced molecular behavior of Cis 1,4-polyisoprene and its nanocomposites monitored by solid-state NMR
… found to exhibit characteristics exemplified by plastic crystals. Phase transitions were identified with NMR and differential scanning calorimetry at -258 K and -253 K for partially deuterated and fully protonated ethyl POSS, respectively. For both derivatives at temperatures above the phase …
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Design and Synthesis of Polymer Networks and Branched Polymers for Triggered Deconstruction of Self-Assembly
The accumulation of plastic waste is becoming a global crisis. While many plastics can technically be recycled, robust plastics which are held together by permanent covalent crosslinks–thermosets, which make up 20% of all plastics–cannot generally be reprocessed or broken down. Generalizable …
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Design, Synthesis and Self-Assembly of Polymeric Building Blocks and Novel Ionic Liquids, Ionic Liquid-Based Polymers and Their Properties
… salts have low entropies of fusion, typical of plastic crystals. These newly discovered imidazolium homopolymers have ionic conductivities up to 10⁴ (S cm⁻¹); however, better properties are still required. Well-designed block copolymers should provide both good electrical and mechanical …
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Secondary relaxation processes in neat and binary glass formers studied by 2H NMR spectroscopy
… NMR techniques to elucidate glassy dynamics in plastic crystals and binary mixtures of glass forming substances. We focus on the Johari-Goldstein beta-process, which not only plays a key role for the understanding of glassy dynamics in neat systems, but also in binary mixtures thereof. The first …