Influence of Polymerization Condition on Electrorheological Effect of Suspension Containing Salt of Poly(Methacrylic Acid)

Abstract

Abstract: Colloidal suspensions containing salts of poly(methacrylic acid ) which exhibit a high electrorheological(ER) activity were synthesized by inverse emulsion polymerization. The factors influencing the ER effect were studied. The results showed that the maximum yield stress occurred in the case where. optimum amounts of both polymeric stabilizer and crosslinking agent were used in the inverse emulsion polymerization as well as a certain water content of the particles, while yield stress increased with the increase of the average diameter of the particles below 0. 9 μm or the molar ratio of the salt to the acid. The ERactivity for the suspensions containing different monovalent counter ions decreased in the following order:Li⁺>Na⁺>K⁺> NH.The phenomena were discussed with the ionic polarization mechanism and the roles of the adsorbed water of the particles in the ERsuspensions were elucidated.

Key words: Electrorheological (ER) fluid, Salts of poly(methacrylic acid), Inverse emulsion polymerization, Suspension, Ionic polarization mechanism

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GUAN Jian-Guo, XIE Hong-Quan, GUO Jun-Shi . Influence of Polymerization Condition on Electrorheological Effect of Suspension Containing Salt of Poly(Methacrylic Acid)[J]. Chem. J. Chinese Universities, 1995, 16(9): 1457.

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Influence of Polymerization Condition on Electrorheological Effect of Suspension Containing Salt of Poly(Methacrylic Acid)

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