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).
Type de document :
Article dans une revue
Langmuir, American Chemical Society, 2011, 27 (7), pp.4098-4103. 〈10.1021/la104936k〉
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Soumis le : mardi 25 février 2014 - 10:42:57
Dernière modification le : mardi 27 novembre 2018 - 16:56:03

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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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