Effects of agitation in emulsion polymerization of vinyl acetate, ethylene, and N-methylol acrylamide

Yong-Hae Choi; Won-Ki Lee

Journal of Industrial and Engineering Chemistry, Vol.16, No.3, 431-436, May, 2010

DOI10.1016/j.jiec.2010.01.042 Export Citation

Effects of agitation in emulsion polymerization of vinyl acetate, ethylene, and N-methylol acrylamide

Yong-Hae Choi, and Won-Ki Lee^†

Division of Chemical Engineering, Pukyong National University, Busan 608-739, Republic of Korea

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The emulsion polymerization of vinyl acetate monomer (VAM), ethylene and N-methylol acrylamide (NMA) was carried out in a high pressure stirred reactor using an Rushton flat blade impeller at a rotational speed of 300 rpm under a semi-batch polymerization process, which was subsequently grown by the continuous addition of monomers (VAM, ethylene, and NMA). The particle diameters of the samples withdrawn during polymerization were determined by using capillary hydrodynamic fractionation (CHDF). Also, the number of particles was calculated from the data obtained by CHDF. Coagulum formation was studied. It was found that coagulum formation increased with increasing conversion and auto-accelerated from ca. 20% conversion. The definition of coagulum in this research was presented. The coagulum formation pattern on the impeller was shown. Also, the flowpattern in the reactor under the same geometrical configuration and operating conditions was simulated.

Keywords:Emulsion polymerization;Particle distribution;Vinyl acetate-ethylene copolymer;Waterborne;Latex

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[2] Park HW, Kim JD, J. Ind. Eng. Chem., 15(4), 578 (2009)

[3] Bonardi C, Ph. Christou, Llauro-Darricades MF, Guillot J, Guyot A, Pichot C, New Polym. Mater., 2, 295 (1991)

[4] Tobing SD, Klein A, J. Appl. Polym. Sci., 79(12), 2230 (2001)

[5] Garrett J, Lovell PA, Shea AJ, Viney DR, Macromol. Symp., 151, 487 (2000)

[6] Laureau C, Vicente M, Barandiaran MJ, Leiza JR, Asua JM, J. Appl. Polym. Sci., 81(5), 1258 (2001)

[7] Klein A, Daniels ES, in: Lovell PA, El-Aasser MS (Eds.), Emulsion Polymerization and Emulsion Polymers, John Wiley and Sons, Chichester, 207 (1997)

[8] Krishnan S, Klein A, El-Aasser MS, Sudol ED, Polym. React. Eng., 335, 1532., 11(3) (2003)

[9] Cha SH, Kim JC, Lim JS, Yoon CS, Koh JH, Chang HI, Kim SW, J. Ind. Eng. Chem., 12(1), 115 (2006)

[10] Gilbert RG, Emulsion Polymerization: A Mechanistic Approach, Academic Press Inc., San Diego (1995)

[11] Van’t Riet K, Smith JM, Chem. Eng. Sci., 30, 1093 (1975)

[12] Van’t Riet K, Bruijin W, Smith JM, Chem. Eng. Sci., 31, 407 (1976)

[13] Oldshue JY, J. Chem. Eng. Prog., 85, 33 (1989)

[14] De Boer GBJ, Chem. Eng. Res. Des., 67, 301 (1989)

[15] Kusters KA, Wijers JG, Thoenes D, Chem. Eng. Sci., 52, 107 (1977)

[16] Mason SG, van de Ven TGM, Colloid Polym. Sci., 255, 468 (1977)