Accession Number : ADA330652
Title : Optical Processes and Devices using Hydrogen Bonded Polydiacetylenes
Descriptive Note : Annual rept. 1 Aug 96-31 Jul 97
Corporate Author : MASSACHUSETTS UNIV LOWELL CENTER FOR ADVANCED MATERIALS
Personal Author(s) : Sandman, Daniel J. ; Kumar, Jayant
PDF Url : ADA330652
Report Date : AUG 1997
Pagination or Media Count : 27
Abstract : This report is presented in three parts: Experiments on Presently Known Materials, New Materials, and Materials for Optical Limiting. Each part is separately referenced and has its own figure numbering and captions. This year's work has made significant progress on several topics. Our observation that the surfaces of urethane-substituted polydiacetylenes(PDA) that were polymerized by (60)Co gamma radiation in the presence of air show conical eruptions on the main crystalline face has been extended to PDA-DCH crystals where an etching of the main crystal face is observed by atomic force nucroscopy. A caveat concerning the need to polymerize these materials in the absence of air has been communicated. alpha-Cinnamic acid crystals that undergo solid state photodimerization when irradiated with ultraviolet light also show conical eruptions when exposed to uv light when air is present, but not when argon is the atmosphere during irradiation. In our attempts to observe photochromic behavior in urethane-substituted PDA other than PDA-PUDO, irradiation at 532 nm of PDA-ETCD and the ethyl urethane of 5,7-heptdecadiyn-1-ol led to irreversible conversion to the red form. New work toward identifying materials that will be useful in optical limiting has been initiated. The tetrabutylammonium salt of nickel bis-benzene-1,2-diselenolate has been found to be a reverse saturable absorber. In the interest of identifying new hydrogen-bonded PDA other than urethanes that exhibit chromic phenomena , primary amine substituted diacetylene monomers have been synthesized.
Descriptors : *HYDROGEN BONDS, *POLYMERS, *OPTICAL PROCESSING, *ACETYLENES, BENZENE, CRYSTAL STRUCTURE, ULTRAVIOLET RADIATION, LIGHT, ETCHING, AMINES, ORGANIC COMPOUNDS, GAMMA RAYS, BUTYL RADICALS, AMMONIUM COMPOUNDS, NICKEL, IRRADIATION, ARGON, CONICAL BODIES, ETHYL RADICALS, IRREVERSIBLE PROCESSES, COBALT, URETHANES, CINNAMIC ACID, PHOTOCHROMISM.
Subject Categories : Organic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE