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Nano-Organization of Amylose-b-Polystyrene Block Copolymer Films Doped with Bipyridine

Abstract : This paper discusses the self-assembly of rod-coil amylose-b-polystyrene (Mal-b-PS) block copolymer thick and thin films. The nano-organization falls in an interdomain spacing d of about 10 am, much smaller than flexible-flexible petrol block copolymer systems. Additionally, hydrogen-bonding interactions between carbohydrate rods (amylose) and 4',4-bipyridine (bipy) molecules induces phase transitions. Indeed, adding bipy in maltooctadecaose-block-polystyrene (Mal18-b-PS) copolymers results, at room temperature, in the formation of a lamellar phase having Mal18 bipy-rich nanodomains instead of hexagonal close-packed (HCP) of cylinders made of Mal18, whereas a coexistence of Mal7bipy-rich cylindrical and spherical nanodomains are formed from maltoheptaose-b-polystyrene (Mal7-b-PS) copolymers instead of a poorly organized array of Mal7-based cylinders. On heating, the Mal7bipy-b-PS system shows more rich phase behavior as compared to the Mal7-b-PS one due to weakening of hydrogen bonding with temperature. Such a system is of great interest in developing active layers in light-emitting diodes (LEDs) or in photovoltaic cells to realize devices with an optimal structure, that is, having large interface area and domain size with similar exciton diffusion length (10 nm).
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Submitted on : Tuesday, February 25, 2014 - 10:42:57 AM
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Karim Aissou, Issei Otsuka, Cyrille Rochas, Sébastien Fort, Sami Halila, et al.. Nano-Organization of Amylose-b-Polystyrene Block Copolymer Films Doped with Bipyridine. Langmuir, American Chemical Society, 2011, 27 (7), pp.4098-4103. ⟨10.1021/la104936k⟩. ⟨hal-00951650⟩



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