High strength disclinations in liquid crystalline polymers with X-shaped two-dimensional mesogenic units

Textures of liquid crystalline polymers with two-dimensional mesogens have been investigated by using polarizing optical microscopy. Disclinations, strength | S| up to 3/2 and 5/2, were found easily in each sample. Occasionally, even high strength disclination pair can be found. These high strength...

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Bibliographic Details
Published inPolymer (Guilford) Vol. 45; no. 7; pp. 2309 - 2312
Main Authors Li, Lei, Zhang, Shuyuan, Li, Zifa
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 2004
Elsevier
Subjects
Applied sciences
Exact sciences and technology
High-strength disclination
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
Textures
High-strength disclination
Textures
Ester copolymer
Optical texture
Liquid crystal polymers
Sebacate copolymer
Thermotropic state
Disclination
Benzoate(hydroxy) copolymer
Experimental study
Adipate copolymer
Succinate copolymer
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Summary:Textures of liquid crystalline polymers with two-dimensional mesogens have been investigated by using polarizing optical microscopy. Disclinations, strength | S| up to 3/2 and 5/2, were found easily in each sample. Occasionally, even high strength disclination pair can be found. These high strength disclinations are very sable in high temperature although they are energy unfavorable according to the theory of Nehring and Saupe. The rare textures may be ascribed to the unique shape of the molecular mesogenic units. The stability of the high strength disclination is attributed to the energy dispersion and high viscosity in polymer melt.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2004.01.041