Elastic moduli of liquid crystalline copolymers | Zendy

Jawad S. Abdul | Zendy

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Elastic moduli of liquid crystalline copolymers

Author(s) -

Jawad S. Abdul

Publication year - 1994

Publication title -

polymer international

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.592

H-Index - 105

eISSN - 1097-0126

pISSN - 0959-8103

DOI - 10.1002/pi.1994.210330405

Subject(s) - thermotropic crystal , materials science , copolymer , composite material , ultimate tensile strength , shear modulus , elastic modulus , modulus , young's modulus , liquid crystalline , bulk modulus , polymer

Dynamic tensile and shear moduli measurements have been carried out on highly oriented thermotropic liquid crystalline copolymers formed by random copolymerization of 2‐hydroxy‐6‐naphthoic acid, terephthalic acid and p ‐aminophenol. This liquid crystalline copolymer is known as HNATA. Application of the aggregate model of units of structure gives rise to an estimation of the orientation angle θ = 5° and a chain modulus E c = 230 GPa. The fall in tensile modulus with increasing temperature is related to two factors: a decrease in the intrinsic chain modulus and a reduction in the shear modulus.

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