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Interfacial behaviors of PMMA-PEO block copolymers at the air/water interface

science{1. chemistry 2005年第6期48卷 567-573页

作者： cheng caixia1, jiao tifeng2. tang rupei1, liu minghua2.& xi fu1 1. state key laboratory of polymer physics and chemistry, joint laboratory of polymer science and materials, institute of chemistry, chinese academy of sciences, beijing 100080, china 2. CAS key laboratory of Colloid and Interface science, institute of chemistry, chinese academy of sciences, beijing 100080, china 1. state {1. laboratory of polymer physics and chemistry Joint Laboratory of Polymer Science and Materials Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China 2. CAS key {1. of Colloid and Interface science Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China

Diblock copolymer of PMMA291.b-PEO1.4 and triblock copolymer of PMMA1.0-b- PEO227-b-PMMA1.0 were synthesized and their interfacial properties at the air-water interface were investigated, where both blocks of polyethylene oxide (PEO) and poly(methyl methacrylate) (PMMA) are surface active but the former is soluble in water while the latter is not. Both the block copolymers could form monolayers with two obvious transition regions. The first transition point is around 1. mN/m, which could be assigned to the pancake-brush change of the PEO chains. The other is around 1. mN/m, which could be ascribed to the condensed packing of PMMA. The surface morphological changes during the compression of the Langmuir monolayers are inves-tigated by using the AFM and SEM methods for the films deposited at different surface pressure or molecular areas. At a lower surface pressure, a typical morphology of PEO-con- taining lipopolymers is observed. Upon compression, sphere-dominant morphologies were observed. While the diblock copolymer is easy to folding, the triblock copolymer is in favor of formation of circular domains through vesiculation.

关键词： PMMA-PEO, block copolymers, monolayer, Langmuir-Blodgett films, AFM.

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