Open AccessPhase diagram of diblock copolymer confined in a cylindrical nanopore with polymer-grafted surface
Author(s) -
Ming Li,
Yuejin Zhu
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.7555
Subject(s) - materials science , copolymer , phase diagram , nanopore , lamellar structure , wetting , polymer , brush , morphology (biology) , cylinder , phase (matter) , monomer , polymer brush , chemical physics , composite material , nanotechnology , geometry , polymerization , physics , mathematics , biology , genetics , quantum mechanics
Using self-consistent field calculation, the new equilibrium morphology of a diblock copolymer melt confined in a brush_covered cylindrical nanopore can be found. The morphology is formed as a function of brush density and A-monomer fraction f. When f=0.7, due to the wetting effect produced by polymer brush the outside concentric lamellar ring will come up again with increasing φAB. We carefully examined the intermediate phases and discovered a rich variety of new two_dimensional structures that have no analogue in the unconfined system, which include nonhexagonally coordinated cylinder phases and structures intermediate between lamellae and cylinders, like CRCR, when f=0.35. Then we map the stability regions and phase boundaries for all the structures we found.