Accession Number : ADA299626

Title :   Real-Time X-ray Scattering Study of Processing of Thermoplastic Polymers: Effects of Stress.

Descriptive Note : Final rept. 1 Sep 94-30 Jun 95,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND ENGINEERIN G

Personal Author(s) : Cebe, Peggy

PDF Url : ADA299626

Report Date : 17 JUL 1995

Pagination or Media Count : 47

Abstract : Wide and small angle X-ray scattering experiments were conducted on a series of liquid crystalline polycarbonates. These materials are thermotropic and exhibit a monotropic liquid crystalline phase. The mesogen is mono- or di-substituted stilbene, and the flexible spacer is methylene. Fibers were drawn from the mesophase --and used in studies of the crystallographic unit cell parameters and thermal transitions. The carbonate linking group between the mesogen and the spacer causes differences in unit cell packing characteristics. Although no odd-even effect is found in the thermal transitions, there is a clear odd-even effect seen in the interchain spacings within the unit cells. jg p.1

Descriptors :   *STRESSES, *REAL TIME, *POLYMERS, *X RAY SCATTERING, *POLYCARBONATES, THERMAL PROPERTIES, FIBERS, PARAMETERS, CELLS, LIQUID CRYSTALS, LIQUID PHASES, PACKAGING, THERMOPLASTIC RESINS, TRANSITIONS, METHYLENES, CRYSTALLOGRAPHY, SUBSTITUTION REACTIONS, SPACERS, ODD EVEN NUCLEI.

Subject Categories : Polymer Chemistry
      Plastics
      Nuclear Physics & Elementary Particle Physics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE