Magnetic Drive for Spinning-Band Column

Foster, N.G.; Green, L. E.

doi:10.1021/ac60071a058

Cited by 15 publications

(8 citation statements)

References 3 publications

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“…On other hand, the most important aspect of the analysis for the interfaces is its tremendous sensitivity to the subtraction of the thermal fluctuation scattering 21. Ruland et al22 demonstrated in an investigation of styrene–isoprene triblock copolymer interfaces variations in interfacial thickness of ±40% when the fluctuation intensity used altered by only ±2%.…”

Section: Resultsmentioning

confidence: 99%

A study of the morphology of polyurethane-polystyrene interpenetrating polymer networks by means of small angle X-ray scattering, modulated-temperature differential scanning calorimetry, and dynamic mechanical thermal analysis techniques

Song

Hourston

Schafer

2001

J. Appl. Polym. Sci.

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The morphology of polyurethane–polystyrene (PU‐PS) (60 : 40 by weight) interpenetrating polymer networks (IPNs), in which internetwork grafting via 2‐hydroxyethyl methacrylate resides (HEMA) (1, 2.5, and 10 wt %, respectively) in the polystyrene networks has been studied by means of small angle X‐ray scattering (SAXS), modulated‐temperature scanning calorimetry (M‐TDSC), and dynamical mechanical thermal analysis (DMTA) techniques. With increasing internetwork grafting, the average size of domains became smaller (SAXS data) and the degree of component mixing increased (M‐TDSC and DMTA results). For the PU‐PS (60 : 40 by weight) IPN with 10% HEMA, the DMTA tan δ‐temperature plot showed a single peak. This DMTA result implied that the morphology of this PU‐PS IPN is homogeneous. However, the M‐TDSC data showed that three PU‐PS (60 : 40) IPNs samples (with 1, 2.5, and 10 wt % HEMA, respectively) were phase separated. For the three IPN samples, the correlation length of the segregated phases, obtained from SAXS data based on the Debye–Bueche method, did not show distinct differences. With increasing internetwork grafting, the scattered intensity decreased. This study concluded that for these IPNs, SAXS is sensitive to the size of domains and component mixing, but no quantitative analysis was given for the component mixing. M‐TDSC is suitable to be used to quantify the degree of component mixing or the weight fraction of interphases, and DMTA is sensitive to damping behavior and to phase continuity. However, DMTA cannot provide quantitative information about the degree of component mixing or the weight (or volume) fraction of the interphases. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1958–1964, 2001

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Section: Resultsmentioning

confidence: 99%

A study of the morphology of polyurethane-polystyrene interpenetrating polymer networks by means of small angle X-ray scattering, modulated-temperature differential scanning calorimetry, and dynamic mechanical thermal analysis techniques

Song

Hourston

Schafer

2001

J. Appl. Polym. Sci.

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“…The instrument resolution Δ k z / k z was kept constant at 3%, where k z = (2π/λ)sinθ is a wavevector normal to the surface, and θ is the grazing incident angle. The instrument setup and data‐fitting routine based on the slicing technique have been described in the literature 40–42. This technique is a model‐free procedure, where the film is subdivided into thin layers, each assigned a scattering length density and interfacial roughness.…”

Section: Methodsmentioning

confidence: 99%

Surface ordering in thin films of liquid‐crystalline polymers containing fluorinated and protonated segments: Neutron‐reflectometry study

Traiphol

Smith

Perahia

2002

J Polym Sci B Polym Phys

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Surface-induced layering of fluorinated and protonated segments in thin films of a main-chain liquid-crystalline polymer, consisting of ␣-methylstilbene, bridged by a fluorinated group was revealed by neutron reflectometry. The layering was driven by the difference in surface energy of the fluorinated and protonated segments and by the inherent ordering of the polymer. The lower-surface-energy fluorinated segments segregated to the air surface, and the protonated segments segregated to the SiO x layer at the Si substrate. The ordering induced by the interface decayed into the film with a characteristic decay length of about 100 Å. The surface-induced periodicity ranged from 15 to 20 Å, which is approximately equal to the molecular dimension of the repeating unit on the polymer backbone. The magnitude of segregation increased upon annealing in the liquid-crystalline temperature range. The segregation was retained upon annealing above the bulk order-disorder transition temperature.

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“…By refining simulated structural models to the experimentally measured one‐dimensional PDF patterns, one can directly visualize molecular structure. As a result, X‐ray scattering has been extensively applied to a wide variety of molecular materials including polymers, [10, 11] metal oxides, [12–18] biomacromolecules, [19–22] aggregates of organic compounds [23–25] and supramolecular architectures [26–34] …”

Section: Introductionmentioning

confidence: 99%

Bimetallic Copper/Ruthenium/Osmium Complexes: Observation of Conformational Differences Between the Solution Phase and Solid State by Atomic Pair Distribution Function Analysis

et al. 2021

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High-energy X-rays cattering and pair distribution function analysis (HEXS/PDF) is apowerfulmethod to reveal the structure of materials lackingl ong-range order,b ut is underutilized for molecular complexes in solution. We demonstrate the application of HEXS/PDF with 0.26 resolution to uncover the solution structure of five bimetallic Cu I /Ru II /Os II complexes.H EXS/PDF of each complex in acetonitrile solution confirms the pairwise distances in the local coordination sphere of each metal center as well as the metal•••metal distances separated by over 12 .T he metal•••metal distance detected in solution is compared with that from the crystal structure and molecular models to confirm that distortions to the metal bridging ligand are unique to the solid state.T his work presents the first example of observing sub-ngstrçm conformational differences by direct comparison of solution phase and solid-state structures and shows the potential for HEXS/PDF in the determination of solution structure of single molecules.

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Magnetic Drive for Spinning-Band Column

Cited by 15 publications

References 3 publications

A study of the morphology of polyurethane-polystyrene interpenetrating polymer networks by means of small angle X-ray scattering, modulated-temperature differential scanning calorimetry, and dynamic mechanical thermal analysis techniques

A study of the morphology of polyurethane-polystyrene interpenetrating polymer networks by means of small angle X-ray scattering, modulated-temperature differential scanning calorimetry, and dynamic mechanical thermal analysis techniques

Surface ordering in thin films of liquid‐crystalline polymers containing fluorinated and protonated segments: Neutron‐reflectometry study

Bimetallic Copper/Ruthenium/Osmium Complexes: Observation of Conformational Differences Between the Solution Phase and Solid State by Atomic Pair Distribution Function Analysis

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