Accession Number : AD0679186

Title :   LIGHT SCATTERING STUDIES OF ORIENTATION CORRELATIONS IN CHOLESTERYL ESTHERS.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS UNIV AMHERST POLYMER RESEARCH INST

Personal Author(s) : Rhodes,M. B. ; Stein,R. S. ; Chu,W. ; Porter,R. S.

Report Date : NOV 1968

Pagination or Media Count : 44

Abstract : Photographic and photometric light scattering patterns from the cholesteryl esters are analyzed in terms of theories previously developed for the scattering from crystalline polymers. The scattering is shown to primarily result from correlations in orientation of anisotropic elements. The solid state may exist in a negatively birefringent spherulitic form with a size dependent upon crystallization temperature, or may occur in the form of randomly correlated aggregates of crystals best characterized by a correlation function. Such random correlation persists through the smectic state. In the cholesteric state, there is a transition to disc-like non-random correlation with a correlation distance and non-randomness parameters dependent upon the ester, temperature, and thermal history. (Author)

Descriptors :   (*CHOLESTERYL ESTERS, OPTICAL PROPERTIES), POLYMERS, ANISOTROPY, PHOTOGRAPHIC ANALYSIS, PHOTOMETERS, DENDRITIC STRUCTURE, SCATTERING

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE