Accession Number : ADA193566

Title :   Hierarchical Structure in Polymeric Solids and Its Influence on Properties.

Descriptive Note : Periodic rept. no. 4, Oct 86-Mar 87,

Corporate Author : BRISTOL UNIV (ENGLAND)

Personal Author(s) : Keller, A

PDF Url : ADA193566

Report Date : Mar 1987

Pagination or Media Count : 24

Abstract : Work was again centered on the family of mesogenic polythers (synthetized by Professor Percec, Cleveland, USA) which are the most ideal model substances for liquid crystal polymers to date in aid of the exploration of polymeric structure hierarchy. Following leads given by results during the preceding period advances were made along two directions. Improved orientation processes have been arrived at which have greatly helped the exploration of the fine scale end of the structure hierarchy. This embraces the identification of different packing modes of the mesogen-spacer sequence constituting these polymers with implications for the whole wide family of substances. In particular, the stacking mode determined by the 3 dimensional contact of mesogens only (our new 'chess board' structure) became clearly distinct from the more traditional layer stacking with potentially wide ranging consequences, for relationship between molecular composition, molecular stacking, morphology and macroscopic properties.

Descriptors :   *LIQUID CRYSTALS, *POLYMERS, *ETHERS, HIERARCHIES, LAYERS, MODELS, MOLECULAR PROPERTIES, MOLECULES, ORIENTATION(DIRECTION), PACKAGING, SCALE, SOLIDS, STACKING

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE