Accession Number : ADA193569

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

Descriptive Note : Periodic rept. no. 3, Apr-Sep 86,

Corporate Author : BRISTOL UNIV (ENGLAND)

Personal Author(s) : Keller, A

PDF Url : ADA193569

Report Date : Sep 1986

Pagination or Media Count : 24

Abstract : Work was centered on the family of mesogenic polyethers (synthetized, Professor Percec, Cleveland, USA) which appear to be the model substance for liquid crystal polymers to date in aid of the exploration of polymeric structure hierarchy. Notable advance was achieved along two directions. By embracing both lyotropic and thermotropic behaviour, coupled with crystallization from both states, and also from isotropic solution, the foundations were laid for a comprehensive investigation of generalized thermodynamic phase stability (phase diagram) and of the resulting morphologies with the ensuing structure hierarchy, to our knowledge for the first time in polymer science in its present completeness. On the fine scale end of the hierarchy molecular and layer arrangements were studies in the various mesogenic and crystallizing phases, utilising x-ray diffraction from specially prepared oriented systems.

Descriptors :   *POLYMERS, *SOLIDS, *ETHERS, CRYSTALLIZATION, HIERARCHIES, ISOTROPISM, LAYERS, LIQUID CRYSTALS, MODELS, MOLECULES, PHASE, PHASE DIAGRAMS, SCALE, SOLUTIONS(GENERAL), STABILITY, THERMODYNAMICS, X RAY DIFFRACTION

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE