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On the polymer effect observed with macromolecular photoinitiators: A study of the viscosity effect on the starting polymerization rate

✍ Scribed by Pascal Leclercq; Jean-Marc Buisine; Xavier Coqueret

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
426 KB
Volume
198
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Photopolymerizable acrylate compositions including small amounts of poly(butyl acrylate) were submitted to photocalorimetric measurements in order to investigate the effect of the mixture viscosity at zero conversion on the initial polymerization kinetics. No significant change of the initial polymerization rate profile was observed for starting viscosities ranging between 4 and 36 mPa Β· s and for a given concentration of low molecular weight photoinitiating system of the benzophenone‐amine type. This demonstrates that the polymer effect that leads to a higher value of the initial polymerization rate (R~p~)~0~ when using an analogous photoinitiating system with the same content in polymeric benzophenone chromophores cannot be ascribed to the higher viscosity at zero conversion that results from the presence of the photosensitive macromolecules.

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