Effect of polymer network on thermodynamic stability and switching behavior of the smectic-C*(alpha) phase
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
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Główny język publikacji
en
Czasopismo
PHYSICAL REVIEW E (35pkt w roku publikacji)
ISSN
2470-0045
EISSN
Wydawca
DOI
URL
Rok publikacji
2017
Numer zeszytu
5
Strony od-do
052702
Numer tomu
96
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+ 1
Streszczenia
Język
en
Treść
A polymer-stabilized liquid crystal based on 4' -(octyloxy) biphenyl-4-carboxylate 2-fluoro-4-((octyl-2yloxy) carbonyl) phenyl (D16) and 1,6 hexanediol diacrylate as a monomer was prepared by in situ photopolymerization. The selected antiferroelectric liquid crystal contains a fast- switching smectic C*alpha phase (SmC*alpha),and the influence of the polymer network on the thermodynamic stability of this phase and its switching behavior under applying time-dependent electric field were studied. Using dielectric spectroscopy and polarizing microscopy, the liquid crystal materials were characterized, and subsequently with the use of the reversal current method (RCM) the current response, especially from the SmC*alpha phase was carefully analyzed. The current response is complex and also depends on the neighboring liquid crystal phases. In the liquid crystal-polymer system, as well as in the liquid crystal-monomer mixture, a significant shift of the temperature range of the SmC*alpha phase toward lower temperatures was observed; however, the thermodynamic instability related to the transformation to the crystalline phase was also noted and characterized. Because of the fuzzy phase transitions detected in the liquid crystal-polymer system by dielectric spectroscopy and also because of the lack of the characteristic dielectric signature of SmC*alpha after polymerization, we proposed the use of the RCM, as a complementary one, to identify the SmC*alpha phase even in such complex materials.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
838460
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