Accession Number : ADA187149

Title :   Molecular Motion and Energy Migration in Polymers.

Descriptive Note : Periodic rept. no. 2, Jan-Jun 83,

Corporate Author : ROYAL INSTITUTION OF GREAT BRITAIN LONDON (ENGLAND)

Personal Author(s) : Phillips, David

PDF Url : ADA187149

Report Date : Jun 1983

Pagination or Media Count : 10

Abstract : In this phase of the work attention has been concentrated upon the technique of time-resolved fluorescence anisotropy, in which the time dependence of the anistropy r(t), can in principle be used to monitor molecular motion. At the outset of this work, a study of the literature revealed many unsatisfactory features. There appeared to be no general agreement upon how properly to carry out the experiment, and interpretation was difficult. Much of the work described here consists of a critical evaluation of methods and applications to two polymers systems in solution, poly (methyl methacrylate) PMMA covalently labelled with poly (1-vinyl naphthalene) and poly (acenaphtylene) respectively, shown below. Anistropy is a more useful parameter than a degree of polarization in defining order and motion in molecular systems in that for a fluorophore which decays exponentially with a single component.

Descriptors :   *POLYMERS, *MOLECULAR ROTATION, *ENERGY TRANSFER, ANISOTROPY, CRITICAL PATH METHODS, FLUORESCENCE, METHACRYLATES, MOLECULAR STRUCTURE, MOLECULES, MOTION, POLARIZATION, TEST AND EVALUATION, TIME, TIME DEPENDENCE, POLYMETHYL METHACRYLATE, NAPHTHALENES, SOLUTIONS(GENERAL), POLYSTYRENE, DECAY, GREAT BRITAIN

Subject Categories : Polymer Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE