Accession Number : AD0666123

Title :   THE RELATIONSHIP BETWEEN MOLECULAR STRUCTURE, MORPHOLOGY, AND THE MECHANICAL PROPERTIES OF POLYMERIC MATERIALS.

Descriptive Note : Technical rept. (Final) 1 Sep 58-31 Aug 67,

Corporate Author : MELLON INST PITTSBURGH PA

Personal Author(s) : Markovitz,Hershel

Report Date : 31 AUG 1967

Pagination or Media Count : 26

Abstract : The report briefly summarizes the main results of research accomplished in the following categories: synthesis of model polymers, crystalline polymers, rheological studies and chain conformation of polymeric chains. The first category includes the synthesis of linear polystyrenes and poly-(methylstyrene) with narrow distribution of molecular weights, of well-characterized branched and comb polystyrenes. The section on crystalline polymers includes morphological studies by optical microscopy and light scattering, crystallization kinetics, crystallographic investigations and viscoelastic studies. Under rheological studies are included: a representation for the zero shear viscosity of a wide group of polymers as a function of molecular weight, temperature, and concentration; a corresponding states relation for the temperature dependence of the viscosity of a wide class of materials; the viscoelastic behavior of polystyrene; an analysis of the free vibration method in linear viscoelasticity; viscoelastic, crystal growth rate, and calorimetric studies on 1:3:5 tri-alpha-naphthyl benzene. The final section deals with the theoretical calculation of chain dimensions on the basis of a more realistic model. An appendix lists papers already published or in press.

Descriptors :   (*POLYMERS, MECHANICAL PROPERTIES), STYRENE PLASTICS, POLYETHYLENE PLASTICS, EPOXY RESINS, NYLON, POLYAMIDE PLASTICS, SYNTHESIS(CHEMISTRY), MOLECULAR STRUCTURE, CRYSTAL STRUCTURE, OPTICAL PROPERTIES, CRYSTALLOGRAPHY, RHEOLOGY, VISCOSITY, VISCOELASTICITY, POLYCYCLIC COMPOUNDS, STEREOCHEMISTRY

Subject Categories : Polymer Chemistry
      Plastics
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE