Summary
The synthesis and characterization of side-chain liquid crystalline polyacrylates, polymethacrylates and polysiloxanes containing 4-cyanobiphenyl 4-alkanyloxybenzyl ether side groups are presented. All polymers display respectively a smectic A mesophase. The influence of the polymer backbone flexibility on the phase transition temperatures of the synthesized side-chain liquid crystalline polymers is discussed. The results demonstrate that flexible backbones enhance the decoupling of the motions of the side chain and main chain. Therefore, among three kinds of polymer backbones which contain the same mesogenic side groups, the most flexible one, i.e., polysiloxane, reveals a highest isotropization temperature and a widest temperature range of mesophase.
Similar content being viewed by others
References
H. Finkelmann, G. Rehage, Adv. Polym. Sci., 60/61, 99 (1984).
V. P. Shibaev, N. A. Plate, Adv. Polym. Sci., 60/61, 173 (1984)
C. Noel, Makromol chem., Macromol Symp., 22, 95 (1988).
H. Ringsdorf, B. Schlarb and J.Venzmer, Angew. Chem., Int. Ed. Engl., 27, 113 (1988).
C. B. McArdle Ed., Side Chain Liquid Crystal Polymers, Blackie, Glasgow and Chapman and Hall, New York (1989).
C. S. Hsu and V. Percec, J. of Polym. Sci., Polym. Chem. Ed., 25, 2909 (1987).
C. S. Hsu and V. Percec, J. of Polym. Sci., Polym. Chem. Ed., 27, 453 (1989).
C. J. Hsieh, C. S. Hsu, G. H. Hsiue and V. Percec, J. Polym. Sci., Polym. Chem. Ed., 28, 425 (1990).
M. A. Apfel, H. Finkelmann, G. M. Janini, R. T. Lamb, B. H. Luhmann, A. Price, W. L. Roberts, T. J. Show and C. A. Smith, Anal. Chem., 57, 651 (1985).
M. S. Kharasch and T. A. Ashford, J. Am. Chem. Soc., 58, 1733 (1936).
C. S. Hsu, and Y. H. Lu, J. Polym. Sci., Polym. Chem. Ed., 29, 977 (1991).
S. Uchida, K. Morita, K. Miyoshi, K. Hashimoto, K. Kawasaki, Mol. Cryst. Liq. Cryst., 155, 189, (1988).
V. Percec amd C. Pugh, in reference (5) P.30.
V. Percec, D. Tomazos and C. Pugh, Macromolecules, 22, 3259 (1989).
V. Percec, and B. Hahn, Macromolecules, 20, 1588 (1989).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Juang, T.M., Chang, C.F. & Hsu, C.S. Synthesis of side-chain liquid crystalline polyacrylates, polymethacrylates and polysiloxanes containing 4-cyano-biphenyl 4-alkanyloxybenzyl ether side groups. Polymer Bulletin 28, 403–410 (1992). https://doi.org/10.1007/BF00297332
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00297332