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http://dx.doi.org/10.5762/KAIS.2014.15.1.575

Effect of Aromatic Ring Content on the Properties of Liquid Crystalline Copolyesters  

Park, Jong-Ryul (Division of Advanced Materials Science and Engineering, Kongju National University)
Bang, Moon-Soo (Division of Advanced Materials Science and Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.1, 2014 , pp. 575-580 More about this Journal
Abstract
The liquid crystalline copolymers were synthesized through direct polycondensation using 4-[4-(4-hydroxyphenoxy)butoxy]benzoic acid (HBBA) and p-hydroxy benzoic acid (HBA) as monomers. The structure and properties for synthesized copolymers were investigated by $^1H$-NMR, FT-IR, differential scanning calorimetry (DSC), thermogravimetry analysis (TGA) and polarizing optical microscope (POM). As result of investigations, inherent viscosities (${\eta}_{inh}$) of polymers were measured as 0.77~1.60 dL/g in phenol/p-chlorophenol/1,1,2,2-tetrachloroethane (25/40/35=w/w/w). Except for P-80, the ranges of the transition and mesophase temperature of copolymers were increased with increasing the amount of HBA. These properties of polymers were presumably due to increasing of the irregularity and rigidity of polymer chains.
Keywords
chain rigidity; liquid crystalline polymer; mesogenic unit; polyester;
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Times Cited By KSCI : 4  (Citation Analysis)
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