Optical Processes and Devices using Hydrogen Bonded Polydiacetylenes
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1997
- Accession Number
- ADA330652
Entities
People
- Daniel J. Sandman
- Jayant Kumar
Organizations
- University of Massachusetts Lowell