Influence of lateral branches on the properties of liquid crystalline 1,4-Bis-[4-n-hexylbenzoyloxy]-2-subst.-benzenes (II): connection between molecular structure and physical properties

The physical properties and the phase behaviour of some nematic liquid crystals are discussed, with emphasis on the influence of short-range antiparallel dipole correlation that occurs in mesogenic compounds with a strong terminal dipole moment. Evidence for this effect, which stems especially from dielectric studies, is summarized. Variations of the dipole correlation with molecular structure can explain the sometimes unexpected phase behaviour and physical properties of these substances. A qualitative model is given in terms of a monomer-dimer equilibrium.

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Correlation between molecular structure, free volume, and physical properties of a wide range of main chain thermotropic liquid crystalline polymers

Journal of Applied Polymer Science ◽

10.1002/app.2073 ◽

2001 ◽

Vol 82 (9) ◽

pp. 2252-2267 ◽

Cited By ~ 19

Author(s):

Tsung-Tang Hsieh ◽

Carlos Tiu ◽

George P. Simon

Keyword(s):

Molecular Structure ◽

Physical Properties ◽

Free Volume ◽

Liquid Crystalline ◽

Main Chain ◽

Liquid Crystalline Polymers ◽

Crystalline Polymers ◽

Thermotropic Liquid Crystalline Polymers ◽

Wide Range

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Synthesis and characterization of liquid crystalline epoxy resins to study the effect of mesogenic length on the physical properties

Journal of Polymer Research ◽

10.1007/s10965-020-02370-4 ◽

2021 ◽

Vol 28 (2) ◽

Author(s):

Yi-Sheng Lin ◽

Steve Lien-Chung Hsu ◽

Tsung-Han Ho ◽

Li-Cheng Jheng ◽

Yu-Hsiang Hsiao

Keyword(s):

Physical Properties ◽

Epoxy Resins ◽

Liquid Crystalline ◽

Synthesis And Characterization ◽

Liquid Crystalline Epoxy

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Synthesis and Properties of Biodegradable Liquid Crystalline Poly(ester-Urethane)s Based on Poly(L-Lactic Acid)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.459 ◽

2013 ◽

Vol 652-654 ◽

pp. 459-462

Author(s):

Ya Tong Guo ◽

Zhu Zheng ◽

Zhen Qi Hou ◽

Jie Du

Keyword(s):

Phase Transition ◽

Thermal Stability ◽

Lactic Acid ◽

Physical Properties ◽

Liquid Crystalline ◽

Degradation Rate ◽

Hydrolytic Degradation ◽

Hexamethylene Diisocyanate ◽

Solution Polymerization ◽

Phase Transition Temperatures

A series of biodegradable segmented liquid crystalline poly(ester-urethane)s were prepared by solution polymerization of poly(L-lactic acid) (PLLA), mesogenic diol prepolymer poly(butylene terephthaloyldioxy dibenzoates) (MD), and hexamethylene diisocyanate (HDI). The MD content was varied from 0 to 40 mol% so that the effects of the mesogen content on the thermal and physical properties, and hydrolytic degradation were examined respectively. It was found that introducing mesogens units could increase the thermal stability and the elastic properties, while reduced the phase transition temperatures and the hydrolytic degradation rate.

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