Abstract
Novel binary rod-coil and ternary rod-coil-coil mixed-brushes were designed using poly(ethylene glycol) (PEG)-b-poly(styrene) (PS), PEG-b-poly(methyl methacrylate) (PMMA), and PEG-b-polyaniline (PANI) block copolymers. In the current rod-coil mixed-brushes, the brush osmotic pressure did not absolutely affect the surface morphology, instead, the rigidity or flexibility of brushes was a dominant factor. The flexibility of coily PS brushes caused them to be easily entered into the system compared to the rod brushes with higher osmotic pressure, thereby they composed the matrix phase. In a similar growth condition but with packed pancake PMMA brushes, a more faise osmotic pressure was detected for PANI nanorods in the vicinity of PMMA brushes compared to PS ones. A higher faise osmotic pressure for PANI nanorods reflected the lower diameter dispersity and population of PANI nanorods in PEG-b-PMMA/PEG-b-PANI compared to PEG-b-PS/PEG-b-PANI. Via enhancing the amorphous brushes molecular weight, in a constant PANI nanorods molecular weight, the diameter dispersity and population of PANI nanorods increased. The PANI nanorods diameter in binary PS/PANI and PMMA/PANI mixed-brushes ranged in 6–10 nm. With elevating the crystallization temperature, no changes were detected in the morphology of rod-coil mixed-brush single crystals. In the novel ternary mixed-brushes with the amorphous PS and PMMA brushes and the PANI nanorods, the PANI nanorods were dispersed within both matrix (PS) and disperse (PMMA) phases. In these systems, the PANI diameters were 6 and 7 nm in PMMA disperses and 6–9 nm in PS matrix phase. The overall PANI nanorods population was in the range of 594–1392 for binary mixed-brushes. Furthermore, in ternary structures, the PANI overall populations were about 222 and 316 in PMMA and PS phases, respectively. Generally, in all binary and ternary mixed-brush systems, the amorphous brushes (PS and PMMA), due to their flexibility could be arranged in the vicinity of each other in a more facile manner compared to the PANI nanorods, they thus developed matrix phase.
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Abbaspoor, S., Agbolaghi, S., Nazari, M. et al. Disperse-within-disperse patterning on ternary/binary mixed-brush single crystals using polyaniline, polystyrene and poly(methyl methacrylate) grafts. J Polym Res 24, 160 (2017). https://doi.org/10.1007/s10965-017-1322-4
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DOI: https://doi.org/10.1007/s10965-017-1322-4