Syntheses and studies of acetylenic polymers

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1994
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Ding, Yiwei
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Thomas J. Barton
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Chemistry

The Department of Chemistry seeks to provide students with a foundation in the fundamentals and application of chemical theories and processes of the lab. Thus prepared they me pursue careers as teachers, industry supervisors, or research chemists in a variety of domains (governmental, academic, etc).

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The Department of Chemistry was founded in 1880.

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1880-present

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Abstract

A series of new diiodo aryl compounds have been conveniently synthesized. Based on these diiodo compounds, a series of novel soluble polymers, poly(2,5-dialkoxy-1,4-phenyleneethynylene)s (PPE polymers) have been synthesized by using a palladium-catalyzed polymerization. These PPE polymers have been well characterized by routine methods. The molecular weights range from 8,000 to 40,000;The properties of these PPE polymers such as absorption, fluorescence, and conductivity have been studied. A PPE polymer with the butoxy side chain exhibits a weak electrical conductivity ([sigma] = 10[superscript]-3 S/cm) after doping with AsF[subscript]5. The absorption spectra of PPE polymers in THF solution at room temperature show an absorption maximum at [lambda] = 440 nm. However, the absorption spectra of PPE polymers in the film state at room temperature show an absorption maximum at [lambda] = 480 nm. PPE polymer-based light emitting diode (LED) devices have been prepared and studied. Greenish light from these LED devices can be observed;Furthermore, poly(ethynylene-p-arylene-ethynylene-silylene)s have been synthesized through the same palladium-catalyzed polymerization. These polymers have also been characterized by routine methods. The molecular weights of these polymers are between 6,000 and 82,000. Their absorption and fluorescence have been studied. Some of these polymers exhibit thermotropic liquid crystalline properties. In addition, the nonlinear optical properties of these polymers have been briefly examined;Poly(silylene-ethynylene) homopolymers as well as alternating copolymers have been synthesized through a novel palladium-catalyzed polymerization. The molecular weights of these polymers range from 56 x 10[superscript]3 to 5.3 x 10[superscript]3. The thermal stability of these polymers has also been investigated and the char yields range from 51% to 83%. One of these polymers exhibits thermotropic liquid crystalline properties.

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Sat Jan 01 00:00:00 UTC 1994