FARADAY DISCUSSIONS OF THE CHEMICAL SOCIETY NO.79 1985 Polymer Liquid Crystals THE FARADAY DIVISION THE ROYAL SOCIETY O F CHEMISTRY LONDONFARADAY DISCUSSIONS OF THE CHEMICAL SOCIETY NO.79 1985 Polymer Liquid Crystals THE FARADAY DIVISION THE ROYAL SOCIETY O F CHEMISTRY LONDONA GENERAL DISCUSSION O N PoIymer Liquid Crystals lst, 2nd and 3rd April, 1985 A GENERAL DISCUSSION on Polymer Liquid Crystals was held at the University of Cambridge on lst, 2nd and 3rd April 1985. The President of the Faraday Division, Professor P. Gray, FRS, was in the chair: about 200 Fellows of the Faraday Division and visitors from overseas attended the meeting. Among the overseas visitors were: Dr W. Adams, U.S.A. Dr M. Ballauff, West Germany Dr A. Baumgartner, West Germany Professor G.C. Berry, U.S.A. Professor J. Blackwell, U.S.A. Professor A. Blumstein, U.S.A. Professor R. B. Blumstein, U.S.A. Miss C. Boffel, West Germany Mr C. Brembati, Italy Dr L. L. Chapoy, Denmark Professor E. Chiellini, Italy Dr C. Corno, Italy Dr G. Costa, Italy Mr R. Eidenschink, West Germany Miss M. Engel, West Germany Miss P. Fabre, France Dr G. Farrow, U.S.A. Dr D. Freitag, West Germany Dr K. H. Gardner, U.S.A. Dr T. Geelhaar, West Germany Dr J. Genz, West Germany Dr D. G. Gray, Canada Professor A. C. Griffin, U.S.A. Dr R. S . Irwin, U.S.A. Dr W. J. Jackson Jr, U.S.A. Mr D. Judas, France Professor M. Kliman, France Dr H-J. Kock, West Germany Mr W. Kreuder, West Germany Professor W. R. Krigbaum, U.S.A. Dr H. Kromer, West Germany Miss S . L. Kwolek, U.S.A. Dr M.Laun, West Germany Dr F. Laupretre, France Professor R. W. Lenz, U.S.A. Dr R. R. Luise, USA Dr E. Marsano, Italy Professor A. F. Martins, Portugal Miss G. Mazelet, France Dr J-P. Meraldi, Switzerland Professor R. B. Meyer, U.S.A. Professor L. Monnerie, France Mr K. Mueller, West Germany Professor M. Muthukumar, U.S.A. Dr P. Navard, France Dr C. Noel, France Professor T. Odijk, The Netherlands Dr U. Pedretti, Italy Professor V. Percec, U.S.A. Dr S . J. Picken, The Netherlands Dr H. Pielartzik, West Germany Mr B. Reck, West Germany Professor H. Ringsdorf, West Germany Dr G. Roessling, West Germany Professor P. S. Russo, U.S.A. Professor E. T. Samulski, U.S.A. Dr D. J. Sikkema, The Netherlands Dr L. S . Singer, U.S.A. Mr P. Sixou, France Mr A. Stroobants, Belgium Professor E. L.Thomas, U.S.A. Professor B. Valenti, Italy Dr S . van der Zwaag, The Netherlands Professor B. Wessten, Sweden Mrs B. Wessten, Sweden Dr K. W. Wissbrun, U.S.A. Miss B. A. Wood, U.S.A. Dr D. Y. Yoon, U.S.A. Dr A. E. Zachariades, U.S.A. Mr R. Zentel, West GermanyOrganising Committee Professor B. R. Jennings (Chairman) Dr B. Griffin Professor A. J. Leadbetter Professor A. Ledwith Dr M. R. Mackley Professor G . Williams Dr A. H. Windle Dr D. A. Young ISBN: 0-85186- 598-4 ISSN: 0301-7249 Printed in Great Britain by J. W. Arrowsmith Ltd, BristolCONTENTS Page 7 21 33 41 55 73 85 125 133 141 149 161 175 191 20 1 215 225 229 Introductory Lecture: Macromolecular Structure and Liquid Crystallinity by E. T. Samulski Balancing Mesogenic and Non-mesogenic Groups in the Design of Ther- motropic Polyesters by R.W. Lenz Structure- Property Correlations in some Nematic Main-chain Polyesters by A. Blumstein, M. M. Gauthier, 0. Thomas and R. B. Blumstein Conjigurational Characteristics and Nematic Order of Semiflexible Ther- motropic Polymers by D. Y. Yoon, S. Bruckner, W. Volksen, J. C. Scott and A. C. Griffin Molecular Correlation in Thermotropic Copolyesters by A. H . Windle, C. Viney, R. Golombok, A. M. Donald and G. R. Mitchell X-Ray Analysis of the Structure of Liquid-crystalline Copolyesters by J . Blackwell, A. Biswas, G. A. Gutierrez and R. A. Chivers GENERAL DISCUSSION Measurements of the Anisotropic Viscous and Elastic Properties of Lyotropic Polymer Nematics by R. B. Meyer, F. Lonberg, V. Taratuta, S.Fraden, S-D. Lee and A. J. Hurd Phase Studies of Binary Mesogenic Systems by W. R. Krigbaum Rheological and Rheo-optical Studies of a Constitutive Equation for Nematogenic Solutions of Rod-like Polymers by G. C. Berry Optical Textures Observed during the Shearing of Thermotropic Liquid-crystal Po 1y m e rs by N. J. Alderman and M. R. Mackley A Model for Domain Flow of Liquid-crystal Polymers by K. F. Wissbrun GENERAL DISCUSSION Dielectric, Nuclear Magnetic Resonance and Electron Spin Resonance Studies of Relaxation Processes in a Liquid-crystalline Polyester by F. Laupretre, C. Noel, W. N. Jenkins and G. Williams Electro-optic Efects in Side-chain Polymer Liquid Crystals by H . J . Coles Defects and their Relationship to Molecular Conjgurations in Nematic Polymers by M . KlCman GENERAL DISCUSSION Mesophase Texture and Defects in Thermotropic Liquid-crystalline Polymers by E. L. Thomas and B. A. Wood241 Chiral Liquid-crystalline Polyesters. Structural Effects on Mesomorphic Behaviour by E. Chiellini and G. Galli Chemical Characteristics of Cellulosic Liquid Crystals by D. G. Gray The Mesophase in Carbonaceous Pitches by L. S . Singer 257 265 273 GENERAL DISCUSSION 289 LIST OF POSTERS 291 INDEX OF NAMES