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Characterization of the chain stiffness for a mesogen‐jacketed liquid crystal polymer: Poly{2,5‐BIS [(4‐Methoxybenzoyl)Oxy] Styrene}
Author(s) -
Wan Xinhua,
Zhang Fei,
Wu Peiqiang,
Zhang Dong,
Feng Xinde,
Zhou QiFeng
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950960119
Subject(s) - styrene , intrinsic viscosity , viscometer , polymer , liquid crystal , persistence length , polymer chemistry , materials science , mesogen , molar mass distribution , macromolecule , viscosity , analytical chemistry (journal) , crystallography , chemistry , organic chemistry , copolymer , composite material , liquid crystalline , biochemistry , optoelectronics
Narrow‐distribution fractions of poly{2,5‐bis[(4‐methoxybenzoyl)oxy] styrene} ranging in weight‐average molecular weight Mw from 1.1 × 10 5 to 1.96 × 10 6 were studied by static light scattering and viscometry in THF at 25 ° C. From Mw and the intrinsic viscosity [ η ] Mark‐Houwink‐Sakurada equation was formulated with K=7.54×10 −4 and ≈=0.82. The relation between [ η ] and Mw was analyzed according to Bohdanecky for the Kratky‐Porod wormlike chain, the ranges of the mass per unit length M L and the persistence length q were estimated as 35 nm −1 M< L 42 nm< −1 and 11.5 nm <13.5 nm, respectively. The values of ≈ and q indicate that the polymer, though a liquid crystal polymer of the side‐chain type, has wormlike chain in dilute solution as most main chain liquid crystal polymers.