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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Subsecond grating growth in a photorefractive polymer.

S M Silence, C A Walsh, J C Scott

|October 2, 2009

Summary

This summary is machine-generated.

This study explores a new photorefractive polymer, showing significantly faster grating formation than previous materials. Findings suggest the presence of mobile charge carriers beyond holes and potential shallow traps.

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Area of Science:

Materials Science
Polymer Chemistry
Optoelectronics

Background:

Photorefractive polymers are crucial for optical data storage and processing.
Existing epoxy-based photorefractive polymers exhibit relatively slow response times.
A new class of photorefractive polymer requires investigation into its dynamic properties.

Purpose of the Study:

To investigate the photorefractive effect dynamics in a novel methyl methacrylate copolymer.
To characterize grating growth times and understand charge transport mechanisms.
To compare the performance with existing photorefractive polymer systems.

Main Methods:

Synthesis of a methyl methacrylate copolymer doped with p-nitroaniline and diethylaminobenzaldehyde diphenylhydrazone.
Measurement of photorefractive grating growth dynamics under varying light intensities.
Analysis of grating competition and revelation effects.
Evaluation of the dependence of growth rate on writing intensity.

Main Results:

Grating growth times were significantly reduced, falling below 1 second at high intensities.
Observed grating competition and revelation effects indicate the mobility of charge carriers other than holes.
A sublinear relationship between growth rate and writing intensity suggests the presence of shallow traps.
The material represents a new class of high-performance photorefractive polymer.

Conclusions:

The novel photorefractive polymer demonstrates exceptionally fast response times.
Charge transport involves mobile species beyond photogenerated holes.
Shallow traps likely influence the photorefractive dynamics.
This material offers potential for advanced optoelectronic applications.