Supporting Information
Janus Triad: Three Types of Nonspherical, Nanoscale Janus Particles from
One Single Triblock Terpolymer
Andrea Wolf, † Andreas Walther,*,‡ and Axel H. E. Müller*,†
†
Macromolecular Chemistry II, University of Bayreuth, D-95447 Bayreuth, Germany
‡
DWI at the RWTH Aachen, D-52056 Aachen, Germany
[email protected]; [email protected]
Gel Permeation Chromatography
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time [min]
Figure S1. GPC trace for tSBT.
Transmission Electron Microscopy (TEM) Micrograph of tSBT with Lucirin TPO
Figure S2. TEM micrographs of a tSBT film with 30 wt % of Lucirin TPO, stained with OsO4 (PB appears black,
PtBS gray and PtBMA white). It clearly shows the same lc-morphology as in the absence of Lucirin TPO.
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Influence of Acetonitrile and Sulfur Monochloride on lc-morphology
The swelling of a tSBT film of the typical lc-morphology in acetonitrile and subsequent crosslinking with S2Cl2 resulted in Janus sheets instead of expected Janus cylinders. TEM
micrographs revealed that the lc-morphology persists after swelling in acetonitrile (see Figure
S3a), while the addition of S2Cl2 causes the transition to an ul-morphology (see Figure S3b).
Figure S3. TEM micrographs of tSBT bulk morphologies after one day of swelling in acetonitrile (a) and additional
treatment with S2Cl2 (b, the inset shows the formed PB-lamellae in higher magnification). Samples are stained with
OsO4 (PB appears black, PtBS gray and PtBMA white).
Insufficient Swelling Time to Obtain Janus Ribbons
After seven hours of swelling of the tSBT film in decane/acetonitrile and subsequent crosslinking, TEM micrographs indicate the development of only few Janus ribbons whereas
mainly Janus cylinders are present.
Figure S4. TEM micrographs of Janus cylinders transforming into Janus ribbons. Sample obtained after seven hours
of swelling in decane/acetonitrile and cross-linking with S2Cl2.
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Janus spheres
Casting of a tSBT film from tert-butanol results in a lamella-sphere morphology (see Figure
S5a). After crosslinking with gaseous S2Cl2 and dissolution in THF, spherical Janus particles
can be seen in the TEM micrograph (see Figure S5b).
Figure S5. TEM micrographs of lamella-sphere morphology of tSBT after film casting from tert-butanol (a) and of
spherical Janus particles synthesized from this bulk morphology (b).
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