Synthesis,characterization and self‐assembly of well‐defined linear heptablock quaterpolymers |
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| Authors: | Christos Ntaras George Polymeropoulos George Zapsas Konstantinos Ntetsikas George Liontos Apostolos Karanastasis Dimitrios Moschovas Sofia Rangou Charlotte Stewart‐Sloan Nikos Hadjichristidis Edwin L Thomas Apostolos Avgeropoulos |
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| Institution: | 1. Polymers Laboratory, Department of Materials Science Engineering, University of Ioannina, University Campus‐Dourouti, Ioannina, Greece;2. Polymer Synthesis Laboratory, King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, KAUST Catalysis Center, Thuwal, Saudi Arabia;3. Institute of Polymer Research, GKSS Research Centre Geesthacht GmbH, Germany;4. Department of Materials Science & Engineering and Institute of Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts;5. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts;6. Department of Materials Science and NanoEngineering, Rice University, Houston, Texas |
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| Abstract: | Two well‐defined heptablock quaterpolymers of the ABCDCBA type Α: polystyrene (PS), B: poly(butadiene) with ～90% 1,4‐microstructure (PB1,4), C: poly(isoprene) with ～55% 3,4‐microstructure (PI3,4) and D: poly(dimethylsiloxane) (PDMS)] were synthesized by combining anionic polymerization high vacuum techniques and hydrosilylation/chlorosilane chemistry. All intermediates and final products were characterized by size exclusion chromatography, membrane osmometry, and proton nuclear magnetic resonance spectroscopy. Fourier transform infrared spectroscopy was used to further verify the chemical modification reaction of the difunctional PDMS. The self‐assembly in bulk of these novel heptablock quarterpolymers, studied by transmission electron microscopy and small angle X‐ray scattering, revealed 3‐phase 4‐layer alternating lamellae morphology of PS, PB1,4, and mixed PI3,4/PDMS domains. Differential scanning calorimetry was used to further confirm the miscibility of PI3,4 and PDMS blocks. It is the first time that PDMS is the central segment in such multiblock polymers (≥3 chemically different blocks). © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1443–1449 |
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| Keywords: | anionic polymerization chlorosilane chemistry hydrosilylation miscibility self‐assembly |
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