HPLC fractionation and surface micellization behavior of polystyrene-b-poly(methyl methacrylate)
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- HPLC fractionation and surface micellization behavior of polystyrene-b-poly(methyl methacrylate)
- Chung, BH; Park, Soojin; Chang, TY
- OXIDE) DIBLOCK COPOLYMER; AIR-WATER-INTERFACE; BLOCK CO-POLYMERS; ANIONIC-POLYMERIZATION; MICELLE FORMATION; MICROPHASE SEPARATION; AIR/WATER INTERFACE; POLYSTYRENE; MONOLAYERS; POLYISOPRENE
- Issue Date
- AMER CHEMICAL SOC
- MACROMOLECULES, v.38, no.14, pp.6122 - 6127
- A polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) was fractionated by HPLC, and the morphology of surface micelles formed at the air/water interface was investigated. Individual PS and PMMA blocks were fractionated by normal-phase and reversed-phase HPLC, respectively, into three fractions each to obtain nine fractions of narrower distribution in molecular weight as well as in composition. Although the mother PS-b-PMMA was prepared by anionic polymerization and had a narrow molecular weight distribution as characterized by size exclusion chromatography (Mw = 72.8 kg/mol, M w/Mn = 1.08, PS wt % = 73.7%), the nine fractionated samples showed significant variations in molecular weight (Mw = 63.1-79.5 kg/mol) and in composition (PS wt % = 66.5-76.3%). The fractionated block copolymers formed more uniform surface micelles than the unfractionated mother PS-b-PMMA and exhibited a large variation with respect to the composition. The PS-b-PMMA fraction of the lowest PS content (66.5 wt %) showed circular micelles only. Rod-shaped micelles started to appear with a slight increase in the PS content, but circular and rod-shaped micelles coexist over ca. 10% concentration range and no sharp phase boundary appears to exist. The rod-shaped micelles formed at low PS contents exhibit a structure of linearly connected circular micelles.
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