Interfacial structure in polymer mixtures below the critical point

Chaturvedi, U. K.; Steiner, Ullrich; Zak, Omer; Krausch, Georg; Klein, Jacob

doi:10.1103/physrevlett.63.616

Cited by 67 publications

(48 citation statements)

References 20 publications

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“…Very recently, experimental techniques have been developed that allow high resolution studies of interface formation between partially incompatible polymer couples [4][5][6]. One such technique, utilizing an ion beam method based on nuclear reaction analysis, allows direct measurements of interface composition profiles between deuterated and protonated polymer blends with very high spatial resolution [4]. Mixtures of deuterated and protonated polymers are usually very weakly incompatible [7], allowing for the formation of interfacial regions of finite yet very large extent.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of interface formation between weakly incompatible polymer blends

Harden

1990

J. Phys. France

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Section: Introductionmentioning

confidence: 99%

Kinetics of interface formation between weakly incompatible polymer blends

Harden

1990

J. Phys. France

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“…23 We performed such measurements on samples containing very broad interfaces at the ion beam facility at Durham University. 4,24,25 With this technique, a monoenergetic beam of 3 He + ions is incident on the film.…”

Section: Methodsmentioning

confidence: 99%

Interfacial Structure in Conjugated Polymers: Characterization and Control of the Interface between Poly(9,9-dioctylfluorene) and Poly(9,9-dioctylfluorene-alt-benzothiadiazole)

et al. 2006

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Specular neutron reflectivity and nuclear reaction analysis (NRA) are used to measure the interfacial width between poly(9,9-dioctylfluorene) (F8) and poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) in a 500 nm bilayer. Annealing at temperatures up to 280°C allows us to vary this width over a large range, from ∼1 nm to greater than 30 nm. Approximate calculations using the predictions of self-consistent field theory (SCFT) for both Gaussian and semiflexible chains suggest that in the liquid-liquid regime the Gaussian results of SCFT are valid for this system. We also demonstrate the ability to control the interfacial width in 100 nm bilayers, on both silicon and indium tin oxide (ITO). The procedure of "preannealing" the F8 and F8BT layers, before bringing them together to make a bilayer, allows us to independently control the interfacial width and the properties of the bulk of these 100 nm films.

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“…On the one hand, efforts were devoted at theoretical modeling either through analytical work [2][3][4] or numerical simulations [5][6][7]. On the other hand, new techniques provide density profiles with finer spatial resolution, such as scanning electron microscopy (SEM, resolution 100 nm), forward recoil spectroscopy (FRES, resolution 80 nm) [8], dynamic secondary ion mass spectrometry (DSIMS, resolution 10 nm) [9], nuclear reaction analysis (NRA, resolution 10 nm) [10], small-angle neutron-scattering (SANS, resolution 10 nm) [11], neutron reflectivity (NR, resolution 1 nm) [12], transmission electron microscopy (TEM, resolution 1 nm) [ 13,14], X-ray photoelectron spectroscopy (XPS, resolution 0.1 nm) [15], etc., in addition to more indirect means like infrared spectroscopy and attenuated total reflectance infrared spectroscopy (ATR-IR, resolution 0.1-2 ,um) [16], or thermodynamic and hydrodynamic methods [17]. Experimentalists have also developed tools that probe interfacial forces and complement traditional measurements [18].…”

Section: Polymer-basedmentioning

confidence: 99%

High resolution ultrasonic interferometry for quantitative nondestructive characterization of interfacial adhesion in multilayer (metal/polymer/metal) composites

Lévesque

Legros²,

Michel³

et al. 1993

Journal of Adhesion Science and Technology

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High resolution ultrasonic interferometry for quantitative nondestructive characterization of interfacial adhesion in multilayer (metal/polymer/metal) composites Abstract-We describe an ultrasonic method for the quantitative and nondestructive characterization of interfacial adhesion. Near an interface, such as polymer/metal, there exists a thin interfacial boundary layer at the nm length scale where the polymer may have properties different from those of the bulk polymer. On the other hand, ultrasonics measures linear mechanical properties of materials on a length scale which is that of the wavelength, usually in the range of several µm. Hence, it is usually stated that standard ultrasonic techniques cannot probe interfaces effectively. Here, we report on an ultrasonic interferometry technique that is built around metal/polymer/metal structures and that exhibits high sensitivity to interfacial properties, even at usual ultrasonic wavelengths. A rigorous mathematical model for the ultrasonic response of multilayered media that accounts for viscoelasticity is presented. Results of numerical calculations point out scaling features for interfacial properties in terms of specific stiffness S. We describe our technique and illustrate some experimental results on sample multilayers where interfacial adhesion properties were modified through chemical action on the metal substrates. We show that the measurements confirm the predictions from the model. In particular, it is suggested that adhesion is not a shear-related problem only, but that extensional forces are also important. Finally, we discuss our results in relation to other techniques for characterizing confined molecular systems. This work is meant to be openended, leading to applications for nondestructive evaluation and also to perspectives in the field of fundamentals of adhesion.

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Interfacial structure in polymer mixtures below the critical point

Cited by 67 publications

References 20 publications

Kinetics of interface formation between weakly incompatible polymer blends

Kinetics of interface formation between weakly incompatible polymer blends

Interfacial Structure in Conjugated Polymers: Characterization and Control of the Interface between Poly(9,9-dioctylfluorene) and Poly(9,9-dioctylfluorene-alt-benzothiadiazole)

High resolution ultrasonic interferometry for quantitative nondestructive characterization of interfacial adhesion in multilayer (metal/polymer/metal) composites

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