Investigation of the interdiffusion between poly(methyl methacrylate) films by marker movement

Liu, Y.; Reiter, Günter; Kunz, Klaus; Stamm, Manfred

doi:10.1021/ma00060a050

Cited by 35 publications

(37 citation statements)

References 3 publications

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“…Recently Liu et al 33 published such data for blends of a series of d-PMMA molecular weights in a matrix of h-PMMA (M, = 980 000). These polymers were -4 0 4 0 % syndiotactic and as such had glass transition temperatures consistently lower than those of the polymers we used, which are 7040% syndiotactic.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Surface Enrichment in Isotopic Mixtures of Poly(methyl methacrylate)

Hopkinson¹,

Kiff²,

Richards³

et al. 1995

Macromolecules

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The surface enrichment behavior of blends of perdeuterated poly(methy1 methacrylate) with various molecular weights in a high molecular weight hydrogenous poly(methy1 methacrylate) matrix has been studied using static secondary ion mass spectrometry and neutron reflectrometry. No significant enrichment was observed in any of these blends, and the results are interpreted in light of available diffusion and thermodynamic data. We conclude that the absence of surface enrichment is due to a low surface energy difference between hydrogenous poly(methy1 methacrylate) and deuteropoly(methy1 methacrylate) and believe this difference to be in the range 0.00-0.04 mJ m-2. This is compared to the behavior of the hydrogenous polystyreneldeuteropolystyrene blends where the surface energy difference has been calculated to be 0.08 mJ m+.

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Section: Discussionmentioning

confidence: 99%

Investigation of Surface Enrichment in Isotopic Mixtures of Poly(methyl methacrylate)

Hopkinson¹,

Kiff²,

Richards³

et al. 1995

Macromolecules

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“…The defect elimination kinetics is also strongly affected by D 0 , which is dominated by the chemical structures of BCPs. In the SM system, the effective D 0 dominated by low diffusion PMMA component, is D PMMA, 150 °C ≈ 10 −14 cm 2 s −1 . In comparison, the effective D 0 of the SD system is dominated by PS, which has D PS, 150 °C ≈ 10 −10 cm 2 s −1 near 150 °C, while PDMS has a higher diffusivity (cf.…”

Section: Properties Of the Bcps Of Low‐χ Sm (Ps‐b‐pmma) S2v (Ps‐b‐p2mentioning

confidence: 99%

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

et al. 2017

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One of the fundamental challenges encountered in successful incorporation of directed self-assembly in sub-10 nm scale practical nanolithography is the process compatibility of block copolymers with a high Flory-Huggins interaction parameter (χ). Herein, reliable, fab-compatible, and ultrafast directed self-assembly of high-χ block copolymers is achieved with intense flash light. The instantaneous heating/quenching process over an extremely high temperature (over 600 °C) by flash light irradiation enables large grain growth of sub-10 nm scale self-assembled nanopatterns without thermal degradation or dewetting in a millisecond time scale. A rapid self-assembly mechanism for a highly ordered morphology is identified based on the kinetics and thermodynamics of the block copolymers with strong segregation. Furthermore, this novel self-assembly mechanism is combined with graphoepitaxy to demonstrate the feasibility of ultrafast directed self-assembly of sub-10 nm nanopatterns over a large area. A chemically modified graphene film is used as a flexible and conformal light-absorbing layer. Subsequently, transparent and mechanically flexible nanolithography with a millisecond photothermal process is achieved leading the way for roll-to-roll processability.

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“…Samples are prepared such that the molecular weight distribution remains inhomogeneous throughout the observed evolution. The mobility of polymer liquids is highly dependent on their chain length [34][35][36][37][38][39][40] . As such, a deviation from the behaviour observed in homogeneous systems is expected because the mobility in the sample shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Capillary leveling of stepped films with inhomogeneous molecular mobility

et al. 2013

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A homogeneous thin polymer film with a stepped height profile levels due to the presence of Laplace pressure gradients. Here we report on studies of polymeric samples with precisely controlled, spatially inhomogeneous molecular weight distributions. The viscosity of a polymer melt strongly depends on the chain length distribution; thus, we learn about thin-film hydrodynamics with viscosity gradients. These gradients are achieved by stacking two films with different molecular weights atop one another. After a sufficient time these samples can be well described as having one dimensional viscosity gradients in the plane of the film, with a uniform viscosity normal to the film. We develop a hydrodynamic model that accurately predicts the shape of the experimentally observed self-similar profiles. The model allows for the extraction of a capillary velocity, the ratio of the surface tension and the viscosity, in the system. The results are in excellent agreement with capillary velocity measurements of uniform mono-and bi-disperse stepped films and are consistent with bulk polymer rheology.

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Investigation of the interdiffusion between poly(methyl methacrylate) films by marker movement

Cited by 35 publications

References 3 publications

Investigation of Surface Enrichment in Isotopic Mixtures of Poly(methyl methacrylate)

Investigation of Surface Enrichment in Isotopic Mixtures of Poly(methyl methacrylate)

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

Capillary leveling of stepped films with inhomogeneous molecular mobility

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