소수성 성질을 갖는 Poly(sodium acrylate)s의 물리적 특성

• 영문명: Physical Characteristics of Hydrophobic Poly(sodium acrylate)s
• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: 안범수(Beom Shu Ahn)
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제27권 제4호, 545~551쪽, 전체 7쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2009.12.31

영문 초록

Hydrophobically monoendcapped poly(sodium acrylate)s formed hydrophobic microdomains in water. This was concluded on poly(sodium acrylate)s with a linear C12-alkyl chain attached specifically at the end of the polymer. There was no well defined CMC (critical micelle concentration), but rather a gradual transition from a micelle free solution to a micelle solution. Steady state fluorescence spectroscopy indicates that the micro domains are rather hydrophobic. At pH 5 in the abscence of salt and at pH 9 in the prescence of 1 M sodium citrate the CAC (critical aggregation concentration) was in the range of 0.1 to 2.4mM. However at pH 5 there was a linear increase in the transition concentration with a head-group size due to an increase in steric and electrostatic repulsions between polymer main chains. At pH 9 in the abscence of salt the transition concentration was in the range of 1 to 80 mM. For the larger polymers there was a effect which consisted of a concentration gradient of sodium counterion toward the hydrophobic domain. The effect was larger for the larger polymers because of the higher total sodium concentration and the less steep counterion concentration gradient.

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키워드

hydrophobically modified micelle fluorescence poly sodium acrylate critical aggregation concentration