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고분자 전해질을 이용한 양이온교환막의 표면개질에 관한 연구

Modification of Cation Exchange Membrane Using the Polyelectrolyte

전경용 김한성 한정우 조영일

Chun KY Kim HS Han JW Joe YI

HWAHAK KONGHAK, February 1994, 32(1), 42-50(9), NONE

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Abstract

고분자 전해질인 poly(1-alkyl-4-vinylpyridinium iodide) (alkyl : methy, butyl, heptyl)을 이용하여 상용 양이온 교환막에 흡착시켜 개질한 후, 개질막의 전기화학적 특성과 Na⁺, 및 Ca²⁺의 분리특성을 고찰하였다. 개질막은 개질변수에 따라 이온교환용량, 함수율, 전기전도도는 원막에 비해 특성치가 감소하였음을 알 수 있었다. 고분자 전해질의 분자량이 작을수록 동일한 함침시간에서 더 많은 양이 흡착되었으며, 흡착량이 클수록 선택도는 증가하나, 전기전도도와 이온 플럭스는 감소하였다. Na⁺ 와 Ca²⁺의 전기저항비는 선택분리도와 선형적 비례 관계를 나타내었다.

Commercial cation exchange membrane was modified using poly(1-alkyl-4-vinylpyridinium iodide) as polyelectrolyte. And the electrochemical properties and permselectivity between Ca²⁺ and Na⁺ of the modified membrane were investigated. Ion exchange capacity, water content and specific conductivity of the modified membrane was lower than the original membrane(CL-25T). The smaller the molecular weight of polyelectrolyte was, the larger the adsorbed amounts were for same dipping time. As the adsorbed amounts were larger, permselectivity was increased, but specific conductance and ion flux were decreased. Permselectivity was also increased with the formular weight of alkyl group, and specific resistance of Na⁺, Ca²⁺ was proportional to permselectivity.

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References

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