EFFECT OF POLY (METHACRYLIC ACID) POLYELECTROLYTES ON STABILITY OF ALUMINA SUSPENSION SYSTEMS

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BARATI A.; KOUKABI MORTEZA

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Journal: Iranian Journal of Polymer Science and Technology Year:2002 | Volume:15 | Issue:2 (ISSUE NO.58) Page(s): 131-141

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Title

EFFECT OF POLY (METHACRYLIC ACID) POLYELECTROLYTES ON STABILITY OF ALUMINA SUSPENSION SYSTEMS

Author(s)

BARATI A. | KOUKABI MORTEZA | Issue Writer Certificate

Keywords

SUSPENSIONQ4

STABILITYQ3

Α-AL2O3Q4

POLYELECTROLYTEQ4

GEL CASTINGQ4

Abstract

In order to produce a green ceramic part with a desirable microstructure and higher density, attaining a stabilized SUSPENSION with the maximum ceramic loading level with suitable viscosity to flow and casting is of great importance.In this work, the STABILITY of aqueous Α-AL2O3 SUSPENSIONs in presence of Na+ and NH4+ salts of poly (methacrylic acid) (PMAA) POLYELECTROLYTE was studied and the effects of various parameters such as the amount of POLYELECTROLYTEs present, ceramic loading level, the amount of accelerator in GEL CASTING system, i.e. TEMED (N,N,N',N'-tetramethyl ethylene diamine) and the ultrasonic shaking time on the STABILITY were investigated. The optimum amounts of PMAA (for both salts) required to achieve higher STABILITY and lower viscosity for SUSPENSIONs were determined (0.3mL/ 100 g of dry powder) The results show that increasing the amount of ceramic loading level increases merely the viscosity of SUSPENSION in low shear rates. The critical amount of TEMED added to the SUSPENSION including POLYELECTROLYTE is 0.4 mL/100 g of dry powder. Above this level, pH and viscosity of SUSPENSION increase rapidly. The ultrasonic shaking time has also a limiting level above which the viscosity of SUSPENSION rises with a constant slope, i.e. 1.42 mpa, versus time. These valuable results enabled us to prepare a SUSPENSION of 53% by volume (more than 80% by weight) of alumina suitable for gel- casting. The effect of POLYELECTROLYTE on the green body density increment and homogenization of the structure was shown by SEM photographs and comparison were made with the SUSPENSIONs having no POLYELECTROLYTE.

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APA: Copy

BARATI, A., KOUKABI, MORTEZA,. (2002). EFFECT OF POLY (METHACRYLIC ACID) POLYELECTROLYTES ON STABILITY OF ALUMINA SUSPENSION SYSTEMS. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 15(2 (ISSUE NO.58)), 131-141. SID. https://sid.ir/paper/6298/en

Vancouver: Copy

BARATI A., KOUKABI MORTEZA. EFFECT OF POLY (METHACRYLIC ACID) POLYELECTROLYTES ON STABILITY OF ALUMINA SUSPENSION SYSTEMS. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2002;15(2 (ISSUE NO.58)):131-141. Available from: https://sid.ir/paper/6298/en

IEEE: Copy

A. BARATI, MORTEZA KOUKABI, an, “EFFECT OF POLY (METHACRYLIC ACID) POLYELECTROLYTES ON STABILITY OF ALUMINA SUSPENSION SYSTEMS,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 15, no. 2 (ISSUE NO.58), pp. 131–141, 2002, [Online]. Available: https://sid.ir/paper/6298/en

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