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Molecular consideration on the lyotropic liquid crystalline behavior of poly(2-cyano-p-phenylene terephthalamide) solutions in N-methyl-2-pyrrolidone/calcium chloride

Title
Molecular consideration on the lyotropic liquid crystalline behavior of poly(2-cyano-p-phenylene terephthalamide) solutions in N-methyl-2-pyrrolidone/calcium chloride
Author
김병철
Keywords
para-aramid; lyotropic; poly(2-cyano-p-phenylene terephthalamide); rheology
Issue Date
2016-02
Publisher
SPRINGER
Citation
MACROMOLECULAR RESEARCH, v. 24, NO 2, Page. 182-187
Abstract
The lyotropic liquid crystalline behavior of poly(2-cyano-p-phenylene terephthalamide) (CY-PPTA) solution in the mixture of N-methyl-2-pyrrolidone and calcium chloride was investigated in terms of concentration and temperature. The intrinsic viscosity was decreased with increasing temperature, indicating the contraction of CY-PPTA chain at higher temperature. In dynamic viscosity measurement, the critical concentration (C*) where phase transition to the liquid crystalline phase takes place was decreased with increasing temperature. Above the C*, the dynamic viscosity was decreased and Bingham behavior got more noticeable with increasing concentration due to the development of the liquid crystalline structures. However, Bingham behavior was more notable at higher temperature at a given concentration. The viscosity curves showed the three distinct flow regions suggested by Asada and Onogi and negative first normal stress difference was observed in the range of intermediate shear rates.[Figure not available: see fulltext.] © 2016, The Polymer Society of Korea and Springer Sciene+Business Media Dordrecht.
URI
https://link.springer.com/article/10.1007%2Fs13233-016-4025-5http://hdl.handle.net/20.500.11754/33910
ISSN
1598-5032; 2092-7673
DOI
10.1007/s13233-016-4025-5
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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