Influence of Confinements on the Order of Diblock Copolymer Films

Giessler, K. H.; Rauch, F.; Stamm, Manfred

doi:10.1209/0295-5075/27/8/009

Cited by 21 publications

(34 citation statements)

References 23 publications

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“…[25][26][27] Experimental observations have been published by several groups who have explored the thickness dependence of film morphology in free-standing, 28 sandwiched, 16,[29][30][31] and substrate-supported films. 6,7,13,15,19,20,[32][33][34][35][36][37][38] In total, these studies reveal the following trends. First, DBC domain orientation (or even domain motif!)…”

Section: Introductionmentioning

confidence: 91%

Morphology of Ultrathin Supported Diblock Copolymer Films: Theory and Experiment

Fasolka¹,

Banerjee²,

Mayes³

et al. 2000

Macromolecules

223

237

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An analysis of the morphological behavior of substrate-supported diblock copolymer films for thicknesses t below the equilibrium period L 0 of the copolymer is presented. Substrate-supported films generally exhibit dissimilar interactions between the copolymer block components and the free and substrate surfaces. Accordingly, in this study, self-consistent-field calculations that incorporate asymmetric surface energetics were used to assess equilibrium film morphologies. Phase diagrams were constructed as a function of film thickness, surface interaction energies, the segmental interaction, and the chain length. In conjunction, experiments were conducted on a series of polystyrene-b-poly(n-alkyl methacrylate) copolymer films supported by silicon substrates. These employed a novel atomic force microscopy technique that allowed for the precise tracking of morphology as a function of film thickness. Comparison of the experimental results and calculations revealed several common trends. In particular, hybrid morphologies, incorporating both surface-parallel and surface-perpendicular elements, were observed both experimentally and through the calculations for the thickness regime, t ∼ 0.5L 0. The stability of such structures was found to be closely linked to the symmetry of the surface energetics.

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Section: Introductionmentioning

confidence: 91%

Morphology of Ultrathin Supported Diblock Copolymer Films: Theory and Experiment

Fasolka¹,

Banerjee²,

Mayes³

et al. 2000

Macromolecules

223

237

View full text Add to dashboard Cite

show abstract

“…The cos-modulation of the H/C-ratio indicates that the PS(D) homopolymer is included to a large content in the PS blocks of the lamellar microphase separated copolymer. Due to the lower surface tension of PpMS compared to PS the lamellae are oriented parallel to the surface, where PpMS covers completely the surface 20) . A more detailed description of phase separation of binary mixtures is in progress 22) .…”

Section: Resultsmentioning

confidence: 99%

“…-ion beam of variable incident energy in connection with a dedicated set-up for c-ray detection with a large solid angle is used 19) . The depth resolution for hydrogen profiles depends on the depth in the sample and is for a sample tilt of 10 degrees typically 2 nm (HWHM) at the sample surface and 6 nm at a depth of 100 nm 19,20) . The NRA technique measures only the protonated components.…”

Section: Experimental Partmentioning

confidence: 99%

Segregation of diblock copolymers to the interface between weakly incompatible polymers

Schnell

Stamm²,

Rauch

1999

Macromol. Chem. Phys.

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SUMMARY:The interface between thin films of polystyrene (PS) and polyparamethylstyrene (PpMS) was investigated in the presence of the diblock copolymer P(S-b-pMS). The use of neutron reflectivity and 15 N nuclear reaction analysis in combination with suitable deuteration of the components provides information on the interface width and the distribution of the diblock copolymer at the interface. By variation of the molecular weight of the homopolymers, compatibility can be changed from compatible to incompatible. Depending on molecular weight the diblock copolymers segregate to the interface between the incompatible phases, while in weakly incompatible systems (vN = 3) copolymers are dissolved to a considerable amount in the homopolymer phases. At large copolymer concentration even full compatibility of components can be achieved, which is in good agreement with mean field predictions.

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“…The value Λ 0 = 45 nm has been obtained from the hydrogen depth profile measured in thick P(Sb-pMS) films by the 15 N nuclear-reaction technique. 39,40 With storage under toluene vapor, a destabilization of confined diblock copolymer films with thicknesses h < 2R g becomes possible (storage time of 12 h).…”

Section: ' Sample Preparation and Characterizationmentioning

confidence: 99%

“…With decreasing film thickness, however, the confinement gives rise to an interplay between the intrinsic length scale of the bulk structure (bulk lamellar period, Λ 0 ) and the geometry of the film. The value Λ 0 = 45 nm has been obtained from the hydrogen depth profile measured in thick P(S- b -pMS) films by the 15 N nuclear-reaction technique. , With storage under toluene vapor, a destabilization of confined diblock copolymer films with thicknesses h < 2 R g becomes possible (storage time of 12 h).…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Phase and Microphase Separation of Polymer Thin Films Dewetted from Silicon—A Spin–Echo Resolved Grazing Incidence Neutron Scattering Study

Vorobiev¹,

Major²,

Dosch

et al. 2011

J. Phys. Chem. B

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An understanding of the structure of ultrathin polymer films on solid substrates has scientific importance in applications as well as in fundamental studies of polymer diffusion or adsorption. We present studies of the organization of dewetted droplets of polymers on a silicon surface using a new neutron scattering technique, spin-echo resolved grazing incidence scattering (SERGIS), that has the potential to address at the same time the droplet-droplet correlations and the chemical configuration inside each droplet. For the seminal experiments, the polarized neutron reflectometer EVA at the Institut Laue-Langevin, Grenoble, France, was equipped with a spin-echo setup, and measurements were taken on surface structures previously characterized by different techniques. The dewetted polymers used in our studies were pure polystyrene, a mixture of polystyrene and polyparamethylstyrene, and a diblock copolymer of the two homopolymers. Even with a provisional setup SERGIS, we were able to determine the correlation between the droplets, providing results in excellent agreement with those obtained by atomic force microscopy and grazing incidence small-angle X-ray and neutron scattering. In addition, it was confirmed that the correlation function for diblock copolymer droplets is more complex than for polymer mixtures, exhibiting partial ordering of the copolymer within each droplet.

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Influence of Confinements on the Order of Diblock Copolymer Films

Cited by 21 publications

References 23 publications

Morphology of Ultrathin Supported Diblock Copolymer Films: Theory and Experiment

Morphology of Ultrathin Supported Diblock Copolymer Films: Theory and Experiment

Segregation of diblock copolymers to the interface between weakly incompatible polymers

Phase and Microphase Separation of Polymer Thin Films Dewetted from Silicon—A Spin–Echo Resolved Grazing Incidence Neutron Scattering Study

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