김병철
2017-12-04T02:26:04Z
2017-12-04T02:26:04Z
2016-02
MACROMOLECULAR RESEARCH, v. 24, NO 2, Page. 182-187
1598-5032
2092-7673
https://link.springer.com/article/10.1007%2Fs13233-016-4025-5
http://hdl.handle.net/20.500.11754/33910
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.
This work was supported by the Industrial Strategic Technology Development Program (10042636, Development of para-Aramid Fibers Spinnable in Organic Solvent) funded by the Ministry of Trade, Industry and Energy (MOTIE) of Korea.
en
SPRINGER
para-aramid
lyotropic
poly(2-cyano-p-phenylene terephthalamide)
rheology
Molecular consideration on the lyotropic liquid crystalline behavior of poly(2-cyano-p-phenylene terephthalamide) solutions in N-methyl-2-pyrrolidone/calcium chloride
Article
2
24
10.1007/s13233-016-4025-5
182-187
MACROMOLECULAR RESEARCH
Jung, Dae Eon
Eom, Youngho
Yoon, Hu Young
Lee, Jaeyoung
Kim, Byoung Chul
2016001866
S
COLLEGE OF ENGINEERING[S]
DEPARTMENT OF ORGANIC AND NANO ENGINEERING
bckim