Accession Number : ADA183325

Title :   Fluorescence of Polyureas Based on 1,5-Naphthalene Diisocyanate.

Descriptive Note : Technical rept.,

Corporate Author : UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE

Personal Author(s) : Hoyle,Charles E ; Chang,C H

PDF Url : ADA183325

Report Date : 29 Jul 1987

Pagination or Media Count : 4

Abstract : Polyureas based on 1,5-naphthalene diisocyanate (NDI) form intramolecular excimers in dilute solution. The excimer formation is enhanced in benzene which is a relatively poor solvent for NDI based polyureas. Photolysis in dimethyl formamide solution results in a decrease in the overall intensity and a shift to the red, due most likely to photo-Fries product formation. Excimer fluorescence in the polyurea films is directly dependent on the nature of the diamine reacted with NDI. The excimer fluorescence is particularly strong for the polyurea films based on NDI and 1,12-diaminododecane.

Descriptors :   *FLUORESCENCE, *UREA, *ISOCYANATES, BENZENE, FORMAMIDES, METHYL RADICALS, SOLUTIONS(GENERAL), EXCIMERS, PHOTOLYSIS, DILUTION, SOLUTIONS(MIXTURES), SHIFTING, CHEMILUMINESCENCE, NAPHTHALENES

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE