Accession Number : ADA301932
Title : Cooperative Motion of Side Groups in Amorphous Polymers: Dipolar Interactions.
Descriptive Note : Technical rept.,
Corporate Author : QUEEN'S UNIV KINGSTON (ONTARIO) DEPT OF CHEMISTRY
Personal Author(s) : Meng, X. ; Natansohn, A. ; Barrett, C. ; Rochon, P.
PDF Url : ADA301932
Report Date : 06 NOV 1995
Pagination or Media Count : 4
Abstract : Two ester-type monomers with different polarity, BEM and NBEM, copolymerize with the azo-containing monomer DR1M in random fashion and form amorphous copolymers. The polarity of BEM is comparable to the polarity of DR1M, and the electronic spectra confirm that BEM and DR1M interact with each other more strongly than NBEM and DR1M do. A nonlinear increase of the photoinduced birefringence as a function of azo content is found in DR1M copolymers with the polar BEM group, while the increase is linear in copolymers with the nonpolar NBEM group. Comparison between the two copolymer series suggests that the dipolar association between BEM and DR1M is the major factor causing cooperative motion in these amorphous copolymers enhancing the photoinduced birefringence. jg p.2
Descriptors : *INTERACTIONS, *POLYMERS, *MOTION, *AMORPHOUS MATERIALS, *DIPOLES, REPRINTS, METHYL RADICALS, COPOLYMERS, SPECTRA, NONLINEAR SYSTEMS, ELECTRONIC STATES, BIREFRINGENCE, MONOMERS, ESTERS, POLARITY, PHENYL RADICALS, NITROBENZENES, NITRO RADICALS, BENZOATES, DIAZO COMPOUNDS.
Subject Categories : Polymer Chemistry
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE