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IRTG / Soft Matter Science
Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

Contact: Jana Husse

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softmattergraduate[at]uni-freiburg.de


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You are here: Home Events CANCELLED: Dr. Abraham Chemtob "Radical Photopolymerization in Dispersed Media: from Photoreactor Development to Innovative Latexes"

CANCELLED: Dr. Abraham Chemtob "Radical Photopolymerization in Dispersed Media: from Photoreactor Development to Innovative Latexes"

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Institut de Science des Matériaux de Mulhouse (IS2M), France

What
  • Seminar
When Oct 26, 2016
from 02:15 PM to 03:00 PM
Where Seminarraum A, FMF, Stefan-Meier-Str. 21, Freiburg
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In the polymer industry, there are currently considerable societal and legislative constraints to become compliant with more stringent environmental and health regulations. Polymerization in Dispersed Media (PDM) is today at the forefront of this polymer economy of the future which must be sustainable and eco-efficient. In fact, PDM encompasses a number of distinct processes, such as emulsion and suspension polymerization, to quote the most important industrially, where water is generally the continuous phase. Although PDM has proved to be a tremendous success, there are numerous incentives to go beyond the current technology.

This talk will discuss the opportunities offered by a shift from conventional thermally induced polymerization to a photochemically induced polymerization in this field. The use of light to mediate PDM may appear prima facie as a choice far from intuitive. Obviously, the first difficulty has to do with the strong turbidity of most dispersed systems. Based on these challenges, it seems logical that photoinitiated polymerization has developed essentially as a film cross-linking technology. We will present several examples of eco-efficient, fast and continuous flow photopolymerization techniques to produce high solid content latexes. Our approach is mainly based on miniemulsion photopolymerization performed within specifically designed photoreactors. Unlike conventional macroemulsions (500 nm – 50 µm), miniemulsions are more stable, and their smaller diameters (40 - 500 nm) are assumed to be a key feature to improve light penetration.[1] Additionally, ambient temperature polymerization reduces energy consumption, and the risks of colloidal destabilization or runaway.[2] Finally, there is the potential of novel latex microstructures under UV light, little or almost non-accessible via conventional thermal means.[3]

References
1.    a) M. Penconi et al. Photochem. Photobiol. Sci. 2015, 14, 308-319; b) E. Lobry et al. Macromol. Chem. Phys. 2014, 215, 1201-1211.
2.    a) E. Lobry et al. RSC Adv. 2014, 4, 43756-43759. b) F. Jasinski et al. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1843-1853.
3.    a) F. Jasinski et al. Macromolecules 2016, 49, 1143–1153 b) F. Jasinski et . al. ACS Macro Lett. 2014, 3, 958-962

 

invited by Günter Reiter

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