Accession Number : ADA191474
Title : Energy Migration, Motion and Order in Synthetic Polymers.
Descriptive Note : Periodic rept. no. 1,
Corporate Author : ROYAL INSTITUTION OF GREAT BRITAIN LONDON (UNITED KINGDOM)
Personal Author(s) : Phillips, David
PDF Url : ADA191474
Report Date : Jan 1987
Pagination or Media Count : 9
Abstract : Poly diacetylenes may adopt various configurations in different media, and changes in configuration may be revealed by optical spectroscopy. In PDA crystals and films, the order can be changed by temperature and by compressive stress. In PDA solutions, a change in temperature or solvent leads to a change in the order of the polymer. We have initiated a spectroscopic study of the BCMU's substituted in the 2,3,4, and 9 positions (Table 1), the purpose being to correlate observed spectral features with the structures illustrated in Figure 1. Thus in the linear conjugated segments (LCS) or the wormlike structures, the concept of effective conjugation is introduced to explain red/blue shifts in absorption: a red shift in the absorption corresponds to an increase in the conjugation, either by the straightening of a wormlike structure or by the unravelling of a coil to form a rod. Using this type of argument, spectra of similar PDA's can be compared.
Descriptors : *ACETYLENES, *POLYMERS, ABSORPTION, COMPRESSIVE PROPERTIES, ENERGY, MIGRATION, OPTICAL PROPERTIES, SPECTROSCOPY, STRESSES, SYNTHESIS(CHEMISTRY), ENERGY TRANSFER, SUBSTITUTION REACTIONS, MOLECULAR STRUCTURE
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE