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Lookup NU author(s): Professor Kamelia Boodhoo,
Dr William Dunk,
Dr Roshan Jachuck
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The results are presented for a detailed investigation involving the free-radical photopolymerization of n-butyl acrylate in the form of thin static films. The aim of this work is to benchmark the performance of a novel thin film spinning disk reactor that may be used for the continuous production of linear polymers using photoinitiation. Industrially relevant film thicknesses (200 μm to 1 mm) are studied as opposed to earlier work that looked into extremely thin films (5-25 μm). Such extreme film thicknesses will be difficult to sustain in a thin film reactor without adversely affecting the wettability of the reaction surface and the uniformity of the film. The effects of four main variables (film thickness, UV intensity, initiator concentration, and exposure time) are studied under static film conditions. A 366-nm wavelength is utilized for the UV radiation with 2,2-dimethoxy-2-phenylacetophenone (Irgacure 651) as the photoinitiator dissolved in n-butyl acrylate. The molecular weights, polydispersities, and monomer conversions are measured by gel permeation chromatography. In a 400 μm thick film, conversions of >90% can be achieved with an exposure time of 40 s at a radiation intensity of 175 mW/cm2. The results using the same polymerization system in the spinning disk reactor are presented and compared with the static film results in Part II of this series.
Author(s): Boodhoo KVK, Dunk WAE, Jassim MS, Jachuck RJ
Publication type: Article
Publication status: Published
Journal: Journal of Applied Polymer Science
ISSN (print): 0021-8995
ISSN (electronic): 1097-4628
Publisher: John Wiley & Sons, Inc.
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