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Definitions of Basic Terms Relating to Polymer Liquid Crystals (IUPAC Recommendations 2001)

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Chemistry International -- Newsmagazine for IUPAC
From the journal Chemistry International -- Newsmagazine for IUPAC Volume 24 Issue 4

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Highlights from Pure and Applied Chemistry

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Definitions of Basic Terms Relating to Polymer Liquid Crystals (IUPAC Recommendations 2001)

by M. Barón and R. F. T. Stepto

Pure and Applied Chemistry, Vol. 74, No. 3, pp. 493-509 (2002)

This document provides definitions of the basic terms that are used in the field of liquid-crystalline polymers. It is the result of extensive discussions and evaluations by the former Commission of Macromolecular Nomenclature. It was produced with the cooperation and advice of representatives of the International Liquid Crystal Society.

The recommendations concern terminology relating to the structure of liquid-crystalline polymers. In view of the rapid growth of the field, the terms defined have been restricted to those presently in common usage. They have been selected from the recently published comprehensive document "Definitions of Basic Terms Relating to Low-Molar-Mass and Polymer Liquid Crystals" [Pure and Applied Chemistry, 73(5) 845-895 (2001)].

The recommendations are intended to form a readily usable guide for the reader interested in the structural description of polymer liquid crystals. The more comprehensive document (vide supra) should be used for terminology associated with mesophases and the optical textures and physical characteristics of liquid-crystalline materials. The numbering of terms in the document is consistent within itself and cross-references are made to the numbering of terms in the more comprehensive document.

The document contains the following sections: introduction, general definitions, and liquid-crystalline polymers. It also contains a reference list and an alphabetical index of terms that serves as a subject index. The general definitions section gives the definitions of 27 principal terms and some subsidiary terms concerned mainly with the types of mesophase and types of mesogen; one example is reproduced at right. The section dealing specifically with liquid-crystalline polymers defines 12 terms and gives 21 structural examples.

2.7 [2.10] mesogenic group, mesogenic unit, mesogenic moietyA part of a molecule or macromolecule endowed with sufficient anisotropy in both attractive and repulsive forces to contribute strongly to mesophase or, in particular, LC mesophase formation in low-molar-mass and polymeric substances.Notes:1."Mesogenic "is an adjective that in the present document applies to molecular moieties that are structurally compatible with the formation of LC phases by the molecular system in which they exist.2. Mesogenic groups occur in both low-molar-mass and polymeric compounds.3. A majority of mesogenic groups consists of rigid rodor disc-like molecular moieties.Examples
where X and Y are covalent bonds or linking units such as:

<www.iupac.org/publications/pac/2002/7403/7403x0493.html>

Published Online: 2009-09-01
Published in Print: 2002-07

© 2014 by Walter de Gruyter GmbH & Co.

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  2. Vice President’s Column
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  5. Crystallographic Information File (CIF)
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  11. IUPAC News
  12. The Analytical Chemistry Division
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  16. IUPAC Seeks Your Comments
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  18. Presenting recently published IUPAC technical reports and recommendations. Critical Evaluation of Proven Chemical Weapon Destruction Technologies (IUPAC Technical Report)
  19. Definitions of Basic Terms Relating to Polymer Liquid Crystals (IUPAC Recommendations 2001)
  20. New Books and Publications
  21. Interactions Between Soil Particles and Microorganisms: Impact on the Terrestrial Ecosystem
  22. Non-Conventional Polymer Dispersions
  23. Solubility of Ethyne in Liquids
  24. IUPAC Handbook 2002–2003
  25. Handbuch für die Systematische Nomenklatur der Organischen Chemie
  26. Reports from Conferences
  27. Chemistry and Quality of Life
  28. Macromolecules-Metal Complexes
  29. Ionic Polymerization
  30. Polymer Characterization
  31. Heterocyclic Chemistry
  32. On the Web
  33. Co-Operation on International Traceability in Anaytical Chemistry (CITAC)
  34. The International Network for the Availability of Scientific Publications (INASP)
  35. Visualized Thermodynamics
  36. Conference Announcements
  37. Purchasing, Servicing and Maintenance of Scientific Equipment 5-8 November 2002, Cameroon
  38. 2nd European Symposium on Clinical Laboratory and In Vitro Diagnostic Industry 6-7 February 2003, Barcelona, Catalonia, Spain
  39. Conference Announcements in Brief
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https://doi.org/10.1515/ci.2002.24.4.24

Articles in the same Issue

  1. Contents
  2. Vice President’s Column
  3. IUPAC in a Changing World
  4. XML in Chemistry
  5. Crystallographic Information File (CIF)
  6. How Well Are We Using XML in Chemistry?
  7. Markup Languages–How to Structure Chemistry-Related Documents
  8. A Preprint Server for Chemistry
  9. IUPAC Forum
  10. On the Reality of Virtual Libraries
  11. IUPAC News
  12. The Analytical Chemistry Division
  13. IUPAC Projects
  14. Pest Management for Small-Acreage Crops: A Cooperative Global Approach
  15. Provisional Recommendations
  16. IUPAC Seeks Your Comments
  17. Highlights from Pure and Applied Chemistry
  18. Presenting recently published IUPAC technical reports and recommendations. Critical Evaluation of Proven Chemical Weapon Destruction Technologies (IUPAC Technical Report)
  19. Definitions of Basic Terms Relating to Polymer Liquid Crystals (IUPAC Recommendations 2001)
  20. New Books and Publications
  21. Interactions Between Soil Particles and Microorganisms: Impact on the Terrestrial Ecosystem
  22. Non-Conventional Polymer Dispersions
  23. Solubility of Ethyne in Liquids
  24. IUPAC Handbook 2002–2003
  25. Handbuch für die Systematische Nomenklatur der Organischen Chemie
  26. Reports from Conferences
  27. Chemistry and Quality of Life
  28. Macromolecules-Metal Complexes
  29. Ionic Polymerization
  30. Polymer Characterization
  31. Heterocyclic Chemistry
  32. On the Web
  33. Co-Operation on International Traceability in Anaytical Chemistry (CITAC)
  34. The International Network for the Availability of Scientific Publications (INASP)
  35. Visualized Thermodynamics
  36. Conference Announcements
  37. Purchasing, Servicing and Maintenance of Scientific Equipment 5-8 November 2002, Cameroon
  38. 2nd European Symposium on Clinical Laboratory and In Vitro Diagnostic Industry 6-7 February 2003, Barcelona, Catalonia, Spain
  39. Conference Announcements in Brief
  40. Calendar of IUPAC Sponsored Conferences
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