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Kinetics of liquid crystallization for lyotropic liquid crystalline polymers
Author(s) -
Lin Jiaping,
Wu Herong,
Li Shijing
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.1994.210340203
Subject(s) - avrami equation , crystallization , materials science , nucleation , lyotropic , kinetics , thermodynamics , polymer , polarized light microscopy , exponent , liquid crystal , chemical engineering , crystallography , polymer chemistry , liquid crystalline , crystallization of polymers , chemistry , composite material , optics , linguistics , philosophy , physics , optoelectronics , quantum mechanics , engineering
The kinetics of liquid crystalline phase transition from the isotropic state to the anisotropic state, which is by analogy termed liquid crystallization, for poly( p ‐benzamide)(PBA)/H 2 SO 4 and PBA/Nylon 6/H 2 SO 4 systems was investigated by the depolarized light intensity (DLI) technique and polarized light microscopy (PLM). The experimental data were analysed using the Avrami equation. The n value, according to the Avrami equation, is about 1 for both PBA/H 2 SO 4 and PBA/Nylon 6/H 2 SO 4 systems, which suggests that the liquid crystallization of PBA/H 2 SO 4 and PBA/Nylon 6/H 2 SO 4 systems is a process of instantaneous nucleation with one‐dimensional growth. The introduction of Nylon 6 into PBA/H 2 SO 4 does not have any significant effect on the Avrami exponent n . The results also show that the Avrami exponent n and the half‐time for the liquid crystallization are temperature dependent.