Journal
LANGMUIR
Volume 24, Issue 21, Pages 12267-12271Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la802287s
Keywords
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Funding
- Japan Science and Technology Agency (JST) [1509]
- Japan Society for the Promotion of Science (JSPS)
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The effect of molecular weight on the morphology of polystyrene (PS)/poly(methyl methacrylate) (PMMA) composite particles was investigated. PS/PMMA composite particles with different molecular weights (M* = (M-W(PS) + M-w(PMMA))/2 approximate to 2 x 10(4)-1 X 10(6) g(center dot)mol(-1)) were prepared by the release of toluene (T) from PS/PMMA/T (1/1/24, w/w/w) droplets dispersed in an aqueous solution of polyoxyethylene nonylphenyl ether nonionic surfactant (Emulgen 911). As T evaporated, the spherical droplets phase separated, resulting in snowmanlike composite particles with Janus morphology. The nonspherical shape was closely related to the morphology, which depended on M*. The interfacial tension between the phase-separated PS and PMMA phases increased with an increase in M*, and this would allow the formation of the snowmanlike shape to decrease the interfacial area between the PS and the PMMA phases.
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