Accession Number : ADA185749
Title : Molecular Mechanics of Polymeric Interactions.
Descriptive Note : Final rept. 15 Feb 85-14 Apr 87,
Corporate Author : STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
Personal Author(s) : Prasad, Paras N
PDF Url : ADA185749
Report Date : 18 Aug 1987
Pagination or Media Count : 20
Abstract : The research conducted under this contract focused on the molecular mechanics of polymeric films in relation to their ultrastructure and nonlinear optical properties aimed towards eventual applications in integrated optical and microelectronic devices. Several landmark results were obtained. They are: (i) First demonstrate of femtosecond of response of nonresonant optical nonlinearity in conjugated polymers. (ii) First demonstration of third-harmonic generation from monolayer film of a conjugated polymer. (iii) First case of a conformational transition in a monolayer film of a conjugated polymer. (iv) First picosecond coherent Raman scattering study of a polymeric system. Our studies of third order optical nonlinearities using picosecond and subpisecond degenerate four wave mixing as well as third harmonic degeneration established clearly a strong dependence of X(3) on the effective pie-electron conjugation. Our study of vibrationally resonance enhanced nonlinearity using coherent Raman scattering revealed an enhancement by two orders of magnitude with response still in picoseconds. The Langmuir-Blodgett method was applied for the preparation of monolayer and multilayer films of several types of polydiacetylenes. Our study showed that the Langmuir-Blodgett technique can successfully be used for molecular engineering of ultrathin polymeric films with monomolecular control. Other techniques used for the preparation of ultrathin polymeric films were electrochemical polymerization and gas-solid interface reactions.
Descriptors : *MOLECULE MOLECULE INTERACTIONS, *POLYMERIC FILMS, COHERENT SCATTERING, LIGHT SCATTERING, RAMAN SPECTRA, POLYMERS, INTEGRATED SYSTEMS, ELECTROCHEMISTRY, POLYMERIZATION, PYRROLES, GASES, INTERFACES, SOLIDS, SURFACE REACTIONS, ACETYLENES, HETEROCYCLIC COMPOUNDS, LASERS, LANGMUIR PROBES, MONOMERS, MICROELECTRONICS, SUBMINIATURE ELECTRONIC EQUIPMENT, MECHANICS, MOLECULES, NONLINEAR SYSTEMS, OPTICAL PROPERTIES, OPTICAL EQUIPMENT, THIRD HARMONIC GENERATION, ENGINEERING, LAYERS, THIN FILMS
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE