Synthesis and characterization of non-covalent liquid crystalline diblock copolymers
(2000) Macromolecular Chemistry and Physics — Vol. 201, n° 1, p. 31-41 (2000)
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- Poly(dimethylaminoethylrnethacrylate)-b-poly(sodiurn methacrylate) diblocks, (polyDMAEMA-b-polyMA), were synthesized as precursors of liquid crystalline (LC) copolymers. These LC copolymers were prepared by proton-transfer between a carboxylic acid-containing mesogen (A) and the dimethylamino substituent of the poly-DMAEMA block and by electrostatic interactions between the polyMA subunits and an ammonium-containing mesogen (B). When mesogen A is complexed with DMAEMA units, a dramatic enhancement of the mesophase stability is noted. The mesogenic properties of these LC copolymers were compared to those ones of the parent LC homopolymers, in relation to the copolymer composition. The supramolecular organization of the LC diblock copolymers was studied by small-angle X-ray scattering (SAXS), and smectic mesophases were observed in some LC (co)polymers. For samples containing a major LC block, a smectic mesophase coexists with microphases formed by the second amorphous block. Different organizations, including a body-centered lattice of spheres and a hexagonal array of cylinders, were observed, depending on the investigated copolymers and their composition. When the LC block is the minor component, it forms microdomains too small for a liquid crystalline order to emerge. Moreover, no supramolecular organization of these dispersed microdomains was detected by SAXS. A homogeneous smectic mesophase was observed when the two blocks are bearing liquid crystalline moieties. © Wiley-VCH Verlag GmbH, 2000.
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Gohy, J.-F., Antoun, S., Sobry, R., Van Den Bossche, G., & Jérôme, R. (2000). Synthesis and characterization of non-covalent liquid crystalline diblock copolymers. Macromolecular Chemistry and Physics, 201(1), 31-41. https://doi.org/10.1002/(SICI)1521-3935(20000101)201:1<31::AID-MACP31>3.0.CO;2-P (Original work published 2000)