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Structural effect of emulsifiers on the emulsion stability of a water/benzene mixture
Author(s) -
Saito Reiko,
Mitani Shogo,
Saito Maki
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.13213
Subject(s) - peg ratio , ethylene glycol , copolymer , materials science , polymer chemistry , polystyrene , methacrylate , chemistry , organic chemistry , composite material , polymer , finance , economics
Core–shell‐type microspheres with microphase‐separated shells of polystyrene (PS) and poly(ethylene glycol) (PEG) (microsphere block : molar ratio: PS/PEG 49.1/45.9 mol %; M w : PS chain: 1.07 × 10 4 , PEG chain 1.0 × 10 4 ; the ratio of arm numbers of PEG to PS: 1.0; microsphere graft : molar ratio: PS/PEG 33.8/55.9 mol %; M w : PS chain: 1.54 × 10 4 , PEG chain 1.0 × 10 4 , the ratio of arm numbers of PEG to PS: 2.55) were synthesized by crosslinking of spherical domains of poly(2‐hydroxyethyl methacrylate) (PHEMA) and poly(4‐vinyl pyridine) (P4VP) of the microphase‐separated films of poly(ethylene glycol) ‐block ‐poly(2‐hydroxyethyl methacrylate)‐ block ‐polystyrene triblock terpolymer ( M n : 2.18 × 10 4 ; molar ratio: PS 49.1 mol %, PHEMA 5.0 mol %, PEG 45.9 mol %) and polystyrene‐ block ‐[poly(4‐vinyl pyridine)‐ graft ‐poly(ethylene glycol)] block–graft copolymer ( M n : 4.56 × 10 4 ; molar ratio: PS 33.8 mol %, P4VP 10.3 mol %, PEG 55.9 mol %; branch number of PEG: 2.55), respectively. The structures of microphase‐separated films were investigated by transmission electron microscopy and small‐angle X‐ray scattering. The effects of the arm number ratio of PS to PEG and the total arm number on the stability of the water/benzene emulsion were investigated. The emulsion stability of oil in water was improved by using the microsphere synthesized with the microsphere graft . © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 321–331, 2004