Stoichiometric thiol-to-ene ratio dependences of refractive index modulation and shrinkage of volume gratings recorded in photopolymerizable nanoparticle-polymer composites based onstep-growth polymerization

Spectroscopic, photocalorimetric and holographic measurements are conducted to investigate effects of stoichiometric thiol-to-ene ratio on the polymerization dynamics, refractive index modulation, recording sensitivity and polymerization shrinkage of volume gratings recorded in silica nanoparticle-p...

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Bibliographic Details
Published inOptical materials express Vol. 1; no. 6; pp. 1113 - 1120
Main Authors Hata, Eiji, Tomita, Yasuo
Format Journal Article
LanguageEnglish
Published 01.10.2011
Subjects
Gratings (spectra)
Modulation
Nanostructure
Polymer matrix composites
Polymerization
Refractive index
Refractivity
Shrinkage
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Summary:Spectroscopic, photocalorimetric and holographic measurements are conducted to investigate effects of stoichiometric thiol-to-ene ratio on the polymerization dynamics, refractive index modulation, recording sensitivity and polymerization shrinkage of volume gratings recorded in silica nanoparticle-polymer composite films based on step-growth radical addition polymerization. It is found that the polymerization rate of the composite system is maximized at the stoichiometric thiol-ene composition. It is also found that while the refractive index modulation and the recording sensitivity are maximized at the stoichiometric thiol-ene composition, polymerization shrinkage decreases with increasing the thiol monomer fraction. A negative correlation between gel point conversion and shrinkage is observed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:2159-3930
2159-3930
DOI:10.1364/OME.1.001113