Semibatch styrene suspension polymerization processes

Emulsion and suspension polymerization processes have widely been studied for more than 40 years. Although both polymerization processes are performed in heterogeneous media, each one presents its own typical characteristics, such as the particle size distribution, molecular weight distribution, polymer particle nucleation rate, and polymerization rate. In this study, semibatch styrene suspension polymerizations were carried out with feed compositions typical of emulsion processes. The initial reactor charge resembled the recipe of standard styrene suspension polymerizations, and the emulsion polymerization constituents were added during the batch. The influence of the moment at which the emulsion feed was started on the course of the polymerization and the effects of the feed on the polymer properties were analyzed. The polymer particle morphology and the average molecular weights changed very significantly with the emulsion feed time, and the changes could lead to the production of broad molecular weight distributions. Core–shell polymer particles could also be obtained, with the core being formed of polymer particles originating from the suspension polymerization process and the shell being formed of polymer particles originating from the emulsion polymerization. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3021–3038, 2003

[1]  W. Ray,et al.  Modeling and experimental studies of aqueous suspension polymerization processes. 2. Experiments in batch reactors , 1993 .

[2]  J. Vanderhoff.  Recent advances in the preparation of latexes , 1993 .

[3]  Marcelo Kaminski Lenzi,et al.  A simple real‐time process control experiment using serial communication , 2001, Comput. Appl. Eng. Educ..

[4]  Marcelo Embiruçu,et al.  Modeling of end-use properties of poly(propylene/ethylene) resins , 2001 .

[5]  C. Georgakis,et al.  Control of emulsion polymerization reactors , 1994 .

[6]  J. Pinto,et al.  Mathematical modeling of polystyrene particle size distribution produced by suspension polymerization , 2000 .

[7]  E. Lima,et al.  Dynamic optimization of semicontinuous emulsion copolymerization reactions: composition and molecular weight distribution , 2001 .

[8]  Enrique Luis Lima,et al.  Control and design of average particle size in styrene suspension polymerizations using NIRS , 2000 .

[9]  C. Scali,et al.  Optimal operation strategies to control the molecular weight distribution of polymer products , 1994 .

[10]  Alexander Penlidis,et al.  Mathematical modeling and computer simulator/database for emulsion polymerizations , 2002 .

[11]  Márcio Nele,et al.  Molecular‐Weight Multimodality of Multiple Flory Distributions , 2002 .

[12]  W. Ray,et al.  Modeling and experimental studies of emulsion copolymerization systems. I. Experimental results , 2001 .

[13]  J. Soares,et al.  Copolymerization of ethylene and α-olefins with combined metallocene catalysts. I. A formal criterion for molecular weight bimodality , 2000 .

[14]  José M. Asua,et al.  Control of Molecular Weight Distribution in Emulsion Polymerization Using On-Line Reaction Calorimetry , 2001 .

[15]  Alexander Penlidis,et al.  An Updated Review on Suspension Polymerization , 1997 .