Title:	Photo and electrically switchable behavior of azobenzene containing pendant bent-core liquid crystalline polymers
Authors:	Srinivasan, M. Vijay Kannan, P. Roy, A.
Keywords:	azo polymers ferroelectricity liquid-crystalline polymers (LCP)
Issue Date:	27-Nov-2012
Publisher:	Wiley
Citation:	Journal of Polymer Science, Part A: Polymer Chemistry, 2012, Vol. 51, p936
Abstract:	New class of photo and electrically switchable azobenzene containing pendant bent-core liquid crystalline monomers (AZBM 1, 2, and 3) and their polymers (AZBP 1, 2, and 3) are reported. The synthesized precursors, monomers, and polymers were characterized by FT-IR, 1H, and 13C NMR spectroscopy. Thermal stability of polymers was examined by thermogravimetric analysis and revealed stable up to 260 °C. The mesophase transition of monomers and polymers are observed through polarized optical microscopy (POM) and further confirmed by differential scanning calorimetry (DSC). The electrically switching property of monomers and their polymers were studied by electro-optical method. Among the three monomers AZBM 1, 2, and 3, AZBM 1 and 2 exhibit antiferroelectric (AF) switching and AZBM 3 exhibits ferroelectric (F) switching behavior. On the other hand, low molecular weight polymers (AZMP 1, 2, and 3) show weak AF and F switching behavior. The photo-switching properties of bent-core azo polymers are investigated using UV-vis spectroscopy, trans to cis isomerization occurs around 25 s for AZBP-1 and 30 s for AZBP-2 and 3 in chloroform, whereas reverse processes take place around 80 and 90 s.
Description:	Open Access
URI:	http://hdl.handle.net/2289/7896
ISSN:	0887-624X 1099-0518 (Online)
Alternative Location:	https://doi.org/10.1002/pola.26455
Copyright:	2012 Wiley Periodicals, Inc.
Appears in Collections:	Research Papers (SCM)

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