Determination of the Flory-Huggins parameter for a pair of polymer units from AFM data for thin films of block copolymers

Men’shikov, E. A.; Bol’shakova, A. V.; Yaminskii, I. V.

doi:10.1134/s2070205109030058

Cited by 11 publications

(12 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For simulation of PS- b -PB with different molecular weights, the total number of PS and PB beads ( N ) was varied. For example, to model PS 34k - b -PB 25k , N was set to 8 and the relative interaction parameters, A PS–PS = A PB–PB and A PS–PB to 25.0 and 40.0, respectively, to match the expected χ N value of 36.7 for PS 34k - b -PB 25k . The number of PS and PB beads was then increased to N = 12 and to N = 16 to model PS- b -PB BCPs with higher molecular weights (PS 67k - b -PB 75k , PS 112k - b -PB 104k ).…”

Section: Results and Discussionmentioning

confidence: 99%

“…The former model of a two-component BCP system was expanded into a four-component system including PS, PB, toluene, and the surrounding aqueous solution (water + SDS). − A coarse-grained model of a single chain of PS- b -PB BCP with N = 8 (the number of beads in a single chain) contained 4 PS beads and 4 PB beads linearly connected by soft springs with a spring constant of 4. The relative interaction parameters between the polymers were set to A PS–PS = A PB–PB = 25.0 and A PS–PB = 40.0 for χ N = 36.7 to match the χ N value of PS 34k - b -PB 25k . Additionally, longer chains with N = 12 (6 PS beads and 6 PB beads) and N = 16 (8 PS beads and 8 PB beads) were simulated to investigate the effect of BCP chain length on particle morphology.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Morphological Evolution of Block Copolymer Particles: Effect of Solvent Evaporation Rate on Particle Shape and Morphology

Shin¹,

Kim²,

Yun³

et al. 2017

ACS Nano

131

159

View full text Add to dashboard Cite

Shape and morphology of polymeric particles are of great importance in controlling their optical properties or self-assembly into unusual superstructures. Confinement of block copolymers (BCPs) in evaporative emulsions affords particles with diverse structures, including prolate ellipsoids, onion-like spheres, oblate ellipsoids, and others. Herein, we report that the evaporation rate of solvent from emulsions encapsulating symmetric polystyrene-b-polybutadiene (PS-b-PB) determines the shape and internal nanostructure of micron-sized BCP particles. A distinct morphological transition from the ellipsoids with striped lamellae to the onion-like spheres was observed with decreasing evaporation rate. Experiments and dissipative particle dynamics (DPD) simulations showed that the evaporation rate affected the organization of BCPs at the particle surface, which determined the final shape and internal nanostructure of the particles. Differences in the solvent diffusion rates in PS and PB at rapid evaporation rates induced alignment of both domains perpendicular to the particle surface, resulting in ellipsoids with axial lamellar stripes. Slower evaporation rates provided sufficient time for BCP organization into onion-like structures with PB as the outermost layer, owing to the preferential interaction of PB with the surroundings. BCP molecular weight was found to influence the critical evaporation rate corresponding to the morphological transition from ellipsoid to onion-like particles, as well as the ellipsoid aspect ratio. DPD simulations produced morphologies similar to those obtained from experiments and thus elucidated the mechanism and driving forces responsible for the evaporation-induced assembly of BCPs into particles with well-defined shapes and morphologies.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Morphological Evolution of Block Copolymer Particles: Effect of Solvent Evaporation Rate on Particle Shape and Morphology

Shin¹,

Kim²,

Yun³

et al. 2017

ACS Nano

131

159

View full text Add to dashboard Cite

show abstract

“…1c). PS and PMA were selected because they are strongly immiscible (χ PS/PMA = 0.03•N = 169•χ PS/PMMA ) 35,36 as observed experimentally with binary mixtures of PS and PMA and PS/PMA block copolymers readily phase segregating. 35,37 Thus, the choice of PS and PMA prevented any specific interaction between the PS core and the PMA canopy potentially influencing the behaviour of the resulting NPs suspensions.…”

Section: Resultsmentioning

confidence: 99%

Polymer-functionalized polymer nanoparticles and their behaviour in suspensions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The microphase separation of block copolymers into ordered nanoscopic polymer domains in bulk material is exclusively determined by the mixing energy F mix of the polymer species A and B in the block copolymer. This internal nanoscale energy minimization in block copolymers can be described by a minimization of the Gibbs free mixing energy ∆G mix , which is mainly dependent on the Flory–Huggins parameter χ AB of the BCP species and their polymerization degrees…”

Section: Energy Minimization During Bcp Microphase Separation At the mentioning

confidence: 99%

Nanoscale Block Copolymer Self‐Assembly and Microscale Polymer Film Dewetting: Progress in Understanding the Role of Interfacial Energies in the Formation of Hierarchical Nanostructures

Lindner

2019

Adv Materials Inter

View full text Add to dashboard Cite

Block copolymer (BCP) self‐assembly (SA) can be exploited for next‐generation lithography for the advanced nanopatterning of surfaces with versatile nanoscale features. To render BCP‐SA suitable for the creation of tailored surface patterns, a fundamental understanding of interfacial interactions is crucial. This progress report gives an overview on the interplay of BCP microscale film thickness modulation and nanoscale microphase separation during BCP‐SA. Light is shed on the role of interfacial energies in both events. Microscale processes determining the topography of BCP films, i.e., hole/island formation and dewetting into droplets, are presented. Nanoscale microphase separation into energetically favorable pattern orientations in dependency on the polymer film thickness and influenced by surface polarities are discussed critically. Finally, examples are shown in which the combination of microscale dewetting and nanoscale microphase separation are exploited to create hierarchical nanostructures from BCPs. An outlook is given presenting successful applications of both mechanisms on prepatterned surfaces in order to control position and morphology of the hierarchical nanostructures. This approach is particularly promising for the creation of advanced surface architectures.

show abstract

Determination of the Flory-Huggins parameter for a pair of polymer units from AFM data for thin films of block copolymers

Cited by 11 publications

References 5 publications

Morphological Evolution of Block Copolymer Particles: Effect of Solvent Evaporation Rate on Particle Shape and Morphology

Morphological Evolution of Block Copolymer Particles: Effect of Solvent Evaporation Rate on Particle Shape and Morphology

Polymer-functionalized polymer nanoparticles and their behaviour in suspensions

Nanoscale Block Copolymer Self‐Assembly and Microscale Polymer Film Dewetting: Progress in Understanding the Role of Interfacial Energies in the Formation of Hierarchical Nanostructures

Contact Info

Product

Resources

About