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General Procedures Polyurethane and Silylated Polyurethane The wall of the SDR housing was cooled to 0 °C. The temperature of the disc was varied between 140 and 240 °C. The educts were mixed as required and fed to the centre of the disc with feed rates between 1 and 7 mL s-1. The product was collected continually after it had flowed down the wall and into the outlet. To prepare the silylated urethanes the product from the SDR were transferred to a static mixer where they were mixed with the desired endcapper and stabiliser. UV-Activated Emulsion Polymerisation of n-Butyl Acrylate An aqueous emulsion of n-butyl acrylate with sodium dodecylsulfate as emulsifier and diphenyl (2,4,6-trimethyl benzoyl)-phosphine oxide (Lucirin TPO) as initiator was fed to the centre of the disc (20 cm), rotating at 200 to 800 rpm, at a rate of 1-7 mL s-1.The disc was preheated to a temperature of 23 °C. The emulsion was continuously irradiated by the UV- lamp (280-400 nm, 400W). The product was collected continuously from the outlet after it flowed down the walls of the housing. UV-Activated Solution Polymerisation of Acrylic Acid and Vinyloxy Ethylene Glycol (VOPEG) An aqueous solution of acrylic acid, VOPEG and the initiator Irgacure 500 was fed at a rate of 1-7 mL s-1 to the centre of the rotating (200 to 400 rpm) disc at a temperature of 23 °C and continuously irradiated. After 100 mL solution had been collected the sample was pumped through the reactor a second time to increase the monomer conversion. In some experiments the acrylic acid and initiator were added in separate portions to the collected solution before it was pumped through the rector for a second or third time. In this way the VOPEG incorporated into the copolymer could be improved. Preparation of BaSO4-Particles An aqueous BaCl2-solution was fed to the disc at a rate of between 0.7 and 2.5 mL s-1. The disc was rotated at speeds between 200 and 2500 rpm. Simultaneously an aqueous solution of Na2SO4 was fed to the disc at varying distances from is centre (3, 5 and 8 cm). The suspension was collected at the outlet after it had flowed down the walls of the housing. 14PDF Image | Spinning Disk Reactor for Polymers and Nanoparticles
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