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Cai[13] had a molar mass Mn = 8000 and was advantageous because it could be used directly for the synthesis of the appropriate polyurethanes and for the formulation of sealing and adhesive raw materials. Such materials are used particularly for seals in wet rooms where a biocide is required. The preparation of silver nano-particles was followed by UV-VIS spectroscopy (Figure 9) and the particle size determined by light scattering techniques (Figure 10). UV-Spektrum Labor-Nr. : Probe : Lsm. : Temperatur: Filter : Bemerk 1 : Bemerk 2 : Datum : Nano-Silver 06121201 Polypropylenglykol Polymer MW 23 °C ohne μm Viskosität ca. 12.02.07 1,00 0,80 0,60 0,40 0,20 0,00 1 10 100 1000 10000 d (nm) d(nm) 1 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0 200 300 400 500 600 700 800 Wave Length Wave Length Figure 9. UV-VIS Spectrum of Silver Nano-Particles in Polyol Outlook Figure 10. Particle Size of Silver Nano- Particles in Polyol from Light Scattering measurements The SDR is particularly suitable for step-growth polymerisations but also for UV-activated polymerisations in bulk, emulsion and in solution. In addition such reactors can be usefully employed for the preparation of nano-particles e.g. of BaSO4 and Ag. Despite the many experimental parameters such as reactor size, feed rate, speed of rotation and temperature etc. in all the examples discussed it was found relatively simple to determine suitable conditions to obtain the desired products. The most important advantages of the SDR are the excellent heat transfer and the large mass transfer coefficient. The plug flow guarantees that every molecule experiences the same reaction conditions. It is also important that the large liquid surface to volume ratio can be maintained during scale-up (cf. Table 3) 12 Absorption Absorbtion IntensityPDF Image | Spinning Disk Reactor for Polymers and Nanoparticles
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