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Proceedings Paper

Solid state polymerization reactions for passive and active guided-wave components
Author(s): Mohamad Al-Sheikhly; William L. McLaughlin; A. Kovacs; L. Wojnarovits; Christos A. Christou; Aristos Christou; David F. Lewis
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Paper Abstract

A thin colorless radiochromic diacetylene monomer sensor coated on a transparent polyester base undergoes solid-state polymerization via free radical mechanisms when irradiated with ultraviolet 266 nm wavelength, x- and gamma rays, and high-energy electron beam irradiation. The radiation-induced polymerization reaction leads to the formation of 1, 4-trans additions as polyconjugations along the ladder-like polymer chains.As a result, the colorless, transparent films responds to ultraviolet and to ionizing radiation by turning deep-blue, with an absorption spectrum that exhibits two distinct absorptions. Pulse radiolysis and flash photolysis techniques were used to measure the kinetics of the polymerization propagation reactions. The pulsed-electron- induced propagation of polymerization has an observed first- order rate constant of the order of 103 s-1, followed by much slower blue-shift of the primary absorption band. The activation energy of the polymerization was found to be approximately equals 50 kJ mol-1. The fast kinetics of the UV-induced polymerization is faster by about one order of magnitude. The film can be utilized for optoelectronics, remote sensing, and radiation dosimetry.

Paper Details

Date Published: 4 April 1997
PDF: 9 pages
Proc. SPIE 3005, Optoelectronic Interconnects and Packaging IV, (4 April 1997); doi: 10.1117/12.271086
Show Author Affiliations
Mohamad Al-Sheikhly, Univ. of Maryland/College Park (United States)
William L. McLaughlin, Univ. of Maryland/College Park (United States)
A. Kovacs, Institute of Isotopes (Hungary)
L. Wojnarovits, Institute of Isotopes (Hungary)
Christos A. Christou, Univ. of Maryland/College Park (United States)
Aristos Christou, Univ. of Maryland/College Park (United States)
David F. Lewis, International Specialty Products (United States)

Published in SPIE Proceedings Vol. 3005:
Optoelectronic Interconnects and Packaging IV
Ray T. Chen; Peter S. Guilfoyle, Editor(s)

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