Journal ArticleDOI
Structure And Thermodynamics of Weakly Segregated Rod-Coil Block Copolymers
TLDR
In this paper, the selfassembly of a series of monodisperse rod−coil block copolymers is studied in the weak segregation limit, and the order to microphase disorder transition (ODT) and nematic isotropic (NI) transition are experimentally investigated.Abstract:
The self-assembly of a series of monodisperse rod−coil block copolymers is studied in the weak segregation limit. This unusual weakly segregated system consists of polyisoprene (PI) coil blocks and poly(alkoxyphenylene vinylene) (PPV) rod blocks solubilized with alkoxy side groups. The order to microphase disorder transition (ODT) and nematic isotropic (NI) transition are experimentally investigated to produce a rod−coil block copolymer phase diagram in a system that follows polymeric scaling relationships. Small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), polarized optical microscopy, depolarized light scattering, and wide-angle X-ray scattering (WAXS) are used to map the phase diagram. As the symmetric diblock copolymer is heated, a series of transitions from lamellar to nematic to isotropic phases are observed. The NI transition temperature decreases with increasing coil fraction, and at high coil fractions only an isotropic phase is observable. The phase behavior is in quali...read more
Citations
More filters
Journal ArticleDOI
Functional nanomaterials based on block copolymer self-assembly
TL;DR: A brief overview of the phase behavior of block copolymers can be found in this paper, where the authors highlight recent advances in the fabrication of various functional nanomaterials based on block copolerant self-assembly and their potential applications.
Journal ArticleDOI
Block Copolymers for Organic Optoelectronics
TL;DR: In this paper, the authors describe both the synthesis and self-assembly of block copolymers for organic optoelectronics, and suggest that block-copolymer strategies previously employed for more classical, insulating polymer systems may be very useful in organic electronics.
Journal ArticleDOI
Self-assembly of rod–coil block copolymers
TL;DR: Rod-coil block copolymers are an increasingly important class of molecules for the self-assembly of functional polymer systems, many of which have rod-like chain conformations due to rigid secondary structures, extended π-conjugation, or aromatic groups along the polymer backbone as discussed by the authors.
Journal ArticleDOI
Facile Synthesis of Well-Defined Block Copolymers Containing Regioregular Poly(3-hexyl thiophene) via Anionic Macroinitiation Method and Their Self-Assembly Behavior
TL;DR: P3HT-P2VP block copolymers were synthesized using anionic macroinitiation of a vinyl end-functionalized P3HT to exhibit sphere, cylinder, lamellae, and nanofiber nanostructures.
Journal ArticleDOI
Mesogen -jacketed liquid crystalline polymers
TL;DR: The semi-rigid rod-like MJLCP with a tunable rod shape in both length and diameter provides an excellent building block in designing novel rod-coil liquid crystalline block copolymers which can self-assemble into hierarchical supramolecular nanostructures depending on the competition between liquid crystal formation and microphase separation.
References
More filters
Journal ArticleDOI
Block Copolymers—Designer Soft Materials
TL;DR: The Knitting Pattern as mentioned in this paper is a block copolymer that was discovered by Reimund Stadler and his coworkers and reflects a delicate free-energy minimization that is common to all blockcopolymer materials.
Journal ArticleDOI
Connection between polymer molecular weight, density, chain dimensions, and melt viscoelastic properties
TL;DR: In this article, it was found that the mean square unperturbed end-to-end distance 0, the density ρ and molecular weight M are related to the plabteau modulus, G 0, G N 0 ∞ { 0 ρ/M} 3, a finding in accord with that of Ronca.
Journal ArticleDOI
Efficient light-emitting diodes based on polymers with high electron affinities
TL;DR: In this article, a new family of processible poly(cyanoterephthalylidene)s was used for electron injection and hole injection in poly(p-phenylene vinylene) (PPV) diodes.
Journal ArticleDOI
Polyisoprene-Polystyrene Diblock Copolymer Phase Diagram near the Order-Disorder Transition
Ashish K. Khandpur,Ashish K. Khandpur,Stephan Förster,Frank S. Bates,Ian W. Hamley,Anthony J. Ryan,Wim Bras,Kristoffer Almdal,Kell Mortensen +8 more
TL;DR: The phase behavior of polyisoprene-polystyrene (PI-PS) diblock copolymers has been studied near the order-disorder transition (ODT) as discussed by the authors.
Journal ArticleDOI
Block copolymer thin films : Physics and applications
Michael J. Fasolka,Anne M. Mayes +1 more
TL;DR: In this paper, a two-part review of block copolymer thin films is presented, focusing on the fundamental physics of these systems, including boundary condition symmetry, hybrid structures, and surface chemical expression.