Ring-opening polymerization, flow

Ring-Opening Polymerization Using Flow Microreactor Systems... 

Paulus RM, Erdmenger T, Becer CR et al (2007) Scale-up of microwave-assisted polymerizations in continuous-flow mode cationic ring-opening polymerization of 2-ethyl-2-oxazoline. Macromol Rapid Commun 28 484—491... 

L-lactide ring opening polymerization CORI Kinetics model based on Ludovic using axial dispersion and compartment model (series of ideal perfectly mixed and plug flow) Banu et al. 2010... 

Onium salt cationic photoinitiators present many unique and interesting opportunities for basic studies of cationic ring-opening polymerizations. Since they are latent photochemical sources of strong Bronsted adds, they can be dissolved in the subject monomers and then precisely tri ered on demand by the application of light. Mixing problems and the use of complex stopped-flow devices and other apparatuses required to overcome them are thus avoided. Only the rate of initiation is different in a photoinitiated cationic polymerization as compared to a conventional thermally initiated polymerization. The rate of initiation for an onium salt-photoinitiated cationic potymerization (eqn [68]) is... 

Microspheres by solvent extraction method were obtained with rate of mixing equal 300 rev/s. Particles by spray drying were produced with spray dryer operated with an inlet temperature of 50°C and outlet temperature of 45°C. The air flow indicator was set at 700 and the aspirator at 5. The polymer solution (concentration 0.5% wt/v) was supplied at 10 mL/min. The concentrations of monomer, initiator, and surfactant in ring-opening dispersion polymerization leading to microspheres were as follows [Lc]o = 2.77 10 mol/L, [tin(II) 2-ethyUiexanoate]o = 4.9 10 mol/L, [poly(DA-CL)] = 1.6 g/L. 

Fig. 33 Flow microreactor for synthesis of hyperbranched polyglycerol by ring-opening multibranching polymerization of glycidol. M micromixer...

Paulus et al. (2007) reported for the first time the use of different continuous-flow microwave reactors for polymerizations, using the cationic ring-opening po-lymerizatiorrs of 2-etlryl-2-oxazoline as a model system. In addition, they correlated the broader molecrrlar-weight distributions with residence time distributions of the continuous-flow reactors using methyl orange as the flow marker. 

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