Accession Number : ADA183424

Title :   Pressure-Induced Phases in a Thermotropic Polyester.

Descriptive Note : Interim rept. 1-31 Jul 87,

Corporate Author : CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE

Personal Author(s) : Hsiao,B S ; Shaw,M T ; Samulski,E T

PDF Url : ADA183424

Report Date : 30 Jul 1987

Pagination or Media Count : 19

Abstract : Studies of a copolyester of 20% hydroxybenzoic acid, 40% isophthalic acid and 40% hydroquinone, a mesomorphic polymer, were carried out under pressure. The phase behavior was characterized by the x-ray diffraction, thermal analysis and high pressure DTA techniques. It was found that pressure induced a new crystal habit in the solid and a new mesophase in this polymer. All thermal transitions have been summarized in a proposed phase diagram. The finding of pressure induced mesomorphism confirms the possibility of extending the range of polymers which might exhibit liquid crystallinity. Keywords: thermotropic Liquid Crystal Polyester, Thermal Analysis, Pressure induced, Mesomorphism.

Descriptors :   *PHASE STUDIES, *POLYESTER PLASTICS, HIGH PRESSURE, MESOMORPHIC COMPOUNDS, PHASE, PHASE DIAGRAMS, PHASE STUDIES, POLYMERS, THERMAL ANALYSIS, THERMAL PROPERTIES, TRANSITIONS, X RAY DIFFRACTION, LIQUID CRYSTALS, BENZOIC ACIDS, PHASE TRANSFORMATIONS, PHTHALIC ACIDS, COPOLYMERS, QUINONES

Subject Categories : Polymer Chemistry
      Plastics
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE