A New Series of Two-Ring-Based Side Chain Liquid Crystalline Polymers: Synthesis and Mesophase Characterization
Goddeti Siva Mohan Reddy A B E , Tanneru Narasimhaswamy C E , Jarugala Jayaramudu B , Emmanuel Rotimi Sadiku B , Konduru Mohana Raju A and Suprakas Sinha Ray DA Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur, 515003, India.
B Chemical, Metallurgical and Material Engineering, Polymer Technology Division, Tshwane University of Technology, Pretoria 0001, South Africa.
C Polymer Division, Council of Scientific and Industrial Research - Central Leather Research Institute, Adyar, Chennai, 600020, India.
D DST/CSIR National Centre for Nano-structured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.
E Corresponding authors. Email: smreddyg@gmail.com, tnswamy99@hotmail.com
Australian Journal of Chemistry 66(6) 667-675 https://doi.org/10.1071/CH13090
Submitted: 22 February 2013 Accepted: 15 March 2013 Published: 27 May 2013
Abstract
A new series of side chain liquid crystalline polymers containing a core, a butamethylenoxy spacer, ester groups, and terminal alkoxy groups were synthesised and their structures were confirmed. The core was constructed with two phenyl rings and an ester linking unit. All the polymers were characterised by hot-stage polarising optical microscopy, differential scanning calorimetry, variable temperature X-ray diffraction, thermogravimetric analysis, and gel permeation chromato-graphy. The polymers were found to be liquid crystalline. The nematic and smectic A (SA) phases were observed for the homologues with short-terminal chains (C2 and C6), whereas the homologues with longer chains (C8 to C12) exhibited a smectic C phase. The thermal stability of the polymers was found to be in the range of 293 to 326°C and the molecular weights of the polymers were found to vary from 6 × 103 to 1.3 × 104.
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