Rate mechanisms of a novel thiol-ene photopolymerization reaction

A novel thiol‐ene photopolymerization reaction involving copolymerization of tetrathiol monomer with vinyl silazane is experimentally characterized and is modeled successfully. The overall polymerization rate is found to be controlled by the ratio of the propagation to chain transfer kinetic paramet...

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Published in:Macromolecular symposia. 2004-02, Vol.206 (1), p.361-374
Main Authors: Reddy, Sirish K., Cramer, Neil B., O' Brien, Allison K., Cross, Tsali, Raj, Rishi, Bowman, Christopher N.
Format: Article
Language:English
Subjects:
Ceramics
Chain transfer
Copolymerization
crosslinking
initiatorless
modeling
Monomers
Photoinitiators
Photopolymerization
Polymerization
thiol-ene
Thiols
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container_issue 1
container_start_page 361
container_title Macromolecular symposia.
container_volume 206
creator Reddy, Sirish K.
Cramer, Neil B.
O' Brien, Allison K.
Cross, Tsali
Raj, Rishi
Bowman, Christopher N.
description A novel thiol‐ene photopolymerization reaction involving copolymerization of tetrathiol monomer with vinyl silazane is experimentally characterized and is modeled successfully. The overall polymerization rate is found to be controlled by the ratio of the propagation to chain transfer kinetic parameters. The polymerization rate of this mixture, in the presence of added photoinitiator, is approximately first order in ene functionality and is independent of thiol functional group concentration. Initiation rates in this system, when cured utilizing a light centered around 365 nm light, and in the presence of no added photoinitiator, are shown to be proportional to the ene monomer concentration. When the mixture is polymerized utilizing light centered at 254 nm light, and without photoinitiator, the initiation rates are proportional to the thiol monomer concentrations. This novel reaction scheme is further utilized to form ultra rapidly polymerizable polymer derived ceramic structures with high aspect ratios.
doi_str_mv 10.1002/masy.200450228
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source Wiley-Blackwell Read & Publish Collection
subjects Ceramics
Chain transfer
Copolymerization
crosslinking
initiatorless
modeling
Monomers
Photoinitiators
Photopolymerization
Polymerization
thiol-ene
Thiols
title Rate mechanisms of a novel thiol-ene photopolymerization reaction
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