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Our analysis[13] suggests that the energy required for the synthesis of SPU prepolymers using an SDR is some 60% of that required for the same process in a STR. Furthermore, due to the SDR containing only a few millilitres of educt and product at any one time the danger to the operators, should the reaction become uncontrolled, is minimal. A product change can be effected with very little effort and in this respect the SDR has considerable advantages compared with a continuous tube reactor. Naturally, the ease of product change and the flexibility of a SDR offer new possibilities for just-in-time production. UV-Activated Radical Polymerisation As opposed to a thermally activated radical polymerisation UV-activation has several advantages. In particular, UV activated polymerisations can be carried out over a very wide temperature range down to ca. -100 °C. Additionally, the generation of radicals is almost temperature independent so that the rate of polymerisation is also less dependent on the temperature.[17-20] However, a limitation for the technical application of UV-activated polymerisations is the limited penetration of the light into the polymerising medium (film thickness). Thus, despite the successful development of the technology, the industrial application of UV-activated polymerisations has been essentially limited to the curing of films and coatings. Due to the limited transparency, batch reactors are of little use and only specially designed tubular-reactors[21] are suitable. On the contrary, the SDR is very suitable; a UV light source can easily be mounted above the rotating disc. Boodhoo et al.[22,23] and Johnstone[24] have employed a SDR for the photo-polymerisation of n-butyl acrylate in bulk. In our own studies[13] we have carried out a photo-initiated emulsion polymerisation of n- butyl acrylate and the aqueous copolymerisation of acrylic acid with vinyloxy polyethylene glycol (VOPEG) using a SDR. UV Initiated Emulsion Polymerisation (3) 9PDF Image | Spinning Disk Reactor for Polymers and Nanoparticles
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