Characterization of thermotropic liquid crystalline polymers
نویسنده
چکیده
The characterization of thermotropic, main chain liquid crystalline polymers for the type, thermal and thermodynamic properties, order, and degree of liquid crystallinity of the anisotropic phase is described through the use of the following methods: (1) polarized light microscopy, (2) wide angle X—ray diffraction, (3) differential scanning calorimetry, (4) small angle light scattering, (5) electron microscopy and electron diffraction, (6) magnetic resonance procedures for order parameter measurements, and (7) melt rheology. Polymers which form either or both nematic and smectic phases are described.
منابع مشابه
A facile synthetic route to novel thermotropic liquid crystalline polymers and characterization of their mesophases
A novel method for the synthesis of a new class of thermotropic liquid crystalline polymers has been developed: it proceeds via a polyaddition reaction involving diepoxy-containing mesogene groups and a monoamine (aniline). The reaction between the epoxy ring and the primary amine produces an intermediate containing a secondary amine which undergoes further reaction with an epoxy ring of anothe...
متن کاملSupramolecular Interactions in the Formation of Thermotropic Liquid Crystalline Polymers
This review will focus on recent developments that have occurred since 2000 on the utilization of specific supramolecular interactions to form polymeric aggregates which exhibit thermotropic liquid crystalline (LC) properties.
متن کاملSynthesis and Characterization of a Thermotropic Liquid-Crystalline Poly[2,5-bis(40-alkoxycarbonylphenyl) styrene]
We report the synthesis and characterization of a series of novel mesogenjacketed liquid-crystalline polymers, poly[2,5-bis(40-alkoxycarbonylphenyl)styrene]s (1-m, where m is the number of carbon atoms in the alkyl tails), along with the corresponding monomers, 2,5-bis(40-alkoxycarbonylphenyl)styrenes (2-m), and their precursors, 2,5-bis(40-alkoxycarbonylphenyl)toluenes (3-m). The influence of ...
متن کاملStilbene-containing Thermotropic Liquid Crystalline Polyesters for Aerospace Applications
Materials used in space travel must maintain thermal and dimensional stability in extreme conditions, while remaining melt processable for ease of industrial production. The rigid chemical structure of stilbene often correlates to polymers exhibiting a liquid crystalline morphology and the olefinic bond undergoes a [2 + 2] cycloaddition in the presence of UV light. Based on the combined benefit...
متن کاملSynthesis of Isothianaphthene (ITN) and 3,4-Ethylenedioxy-Thiophene (EDOT)-Based Low-Bandgap Liquid Crystalline Conjugated Polymers
Copolymers, consisting of isothianaphthene and phenylene derivatives with liquid crystal groups, were synthesized via Migita-Kosugi-Stille polycondensation reaction. IR absorption, UV-vis optical absorption, and PL spectroscopy measurements were carried out. Thermotropic liquid crystallinity of the polymers with bandgap of ~2.5 eV was confirmed.
متن کامل