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Preparation and self-assembly of two-length-scale A-b-(B-b-A)(n)-b-B multiblock copolymers

Faber, M., Voet, V. S. D., ten Brinke, G. & Loos, K., 2012, In : Soft Matter. 8, 16, p. 4479-4485 7 p.

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A-b-(B-b-A)(n)-b-B multiblock copolymers composed of short middle diblock units (B-b-A)(n) and two long A-and B-outer blocks were successfully prepared. The multiblock copolymers consist of polystyrene (S) and poly(p-hydroxystyrene) (pHS) and were prepared through sequential anionic polymerization of styrene and 4-tert-butoxystyrene, followed by hydrolysis of the tert-butoxy group. A hexablock and an octablock copolymer with a low overall polydispersity were synthesized. The self-assembled structures were investigated using Small Angle X-ray Scattering (SAXS) and Transmission Electron Microscopy (TEM). Due to the smaller number of inner blocks and their relatively small molar mass, a single periodic lamellar morphology was observed for the hexablock copolymer while a lamellar-in-lamellar morphology with two thin layers within successive thick layers was observed for the octablock copolymer with larger middle diblock units. These observations are in excellent agreement with existing theories.

Original languageEnglish
Pages (from-to)4479-4485
Number of pages7
JournalSoft Matter
Volume8
Issue number16
Publication statusPublished - 2012

    Keywords

  • SUPRAMOLECULAR POLYMERIC MATERIALS, PENDANT CHROMOPHORIC GROUPS, ORDER-DISORDER TRANSITION, LIGHT-EMITTING POLYMERS, BLOCK-COPOLYMERS, MICROPHASE SEPARATION, DIBLOCK COPOLYMER, LENGTH SCALES, ANIONIC-POLYMERIZATION, PHASE-BEHAVIOR

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