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(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechnique

Unraveling the high strain-rate dynamic stiffening in select model polyurethanes – the role of intermolecular hydrogen bonding

Wu, You-Chi Mason; Hu, Weiguo; Sun, Yuchen; Veysset, David; Kooi, Steven E.; Nelson, Keith A.; Swager, Timothy M.; Hsieh, Alex J.

This study elucidates the influence of molecular attributes on the observed dynamic stiffening in select two-component polyurethanes upon high strain-rate impact. Unlike typical segmented elastomers, polyurethanes consisting of poly(tetramethylene oxide), PTMO, and a diisocyanate, but without a chain extender, are investigated. The hexamethylenediisocyanate (HDI)-based polyurethane, HDI?PU,…
sergio.rodrigues@xenocs.com
27 January 2020
ApplicationCharacterizationCustomer publicationsMaterialParticlesPhase analysisPorous materialRenewable energySAXSTechnique

CO2 capture using three-dimensionally ordered micromesoporous carbon

Vorokhta, Maryna; Morávková, Jaroslava; ?imná?ová, Daniela; Pila?, Radim; Zhigunov, Alexander; Švábová, Martina; Sazama, Petr

Adsorption of CO2 on three-dimensionally ordered micromesoporous carbon with a spherical pore structure has been studied using gravimetric and manometric analyses. Adsorptive properties were compared with activated carbon and nanostructured carbon materials such as carbon nanotubes, zeolitic-imidazolate framework-derived carbon, carbon nanohorns and ordered mesoporous carbon materials. The…
sergio.rodrigues@xenocs.com
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsFractal dimensionMaterialPolymer researchSAXSSizeTechnique

Reinforcement of polychloroprene by grafted silica nanoparticles

Abbas, Zaid M.; Tawfilas, Massimo; Khani, Mohammed M.; Golian, Karl; Marsh, Zachary M.; Jhalaria, Mayank; Simonutti, Roberto; Stefik, Morgan; Kumar, Sanat K.; Benicewicz, Brian C.

Reversible addition-fragmentation chain transfer polymerization of chloroprene on the surface of silica nanoparticles was performed to obtain polychloroprene-grafted-silica nanoparticles (PCP-g-SiO2 NPs). These particles were dispersed in a commercial polychloroprene matrix to obtain PCP nanocomposites with different silica core loadings (1, 5, 10, and 25?wt%). Two different chain graft densities…
sergio.rodrigues@xenocs.com
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSTechniqueWAXS

Gas separation properties of polybenzimidazole/thermally-rearranged polymer blends

Moon, Joshua D.; Bridge, Alexander T.; D’Ambra, Colton; Freeman, Benny D.; Paul, Donald R.

Polybenzimidazole (PBI) is highly selective for H2 removal from mixtures with CO2, but it exhibits low gas permeabilities. Celazole® PBI was blended with more permeable HAB-6FDA-CI, an ortho-functional thermally rearrangeable polyimide, to improve its gas permeabilities while attempting to maintain high selectivity. A compatibilizer, 1-methylimidazole, enhanced phase dispersion when added…
sergio.rodrigues@xenocs.com
27 January 2020
ApplicationCharacterizationCustomer publicationsMaterialOtherParticle interactionsProteins & DNA/RNASAXSSelf-assembled materialShapeSizeStructural biologyTechnique

Twisted Ribbon Aggregates in a Model Peptide System

Rüter, Axel; Kuczera, Stefan; Pochan, Darrin J.; Olsson, Ulf

The model peptides A8K and A10K self-assemble in water into ca. 100 nm long ribbon-like aggregates. These structures can be described as ?-sheets laminated into a ribbon structure with a constant elliptical cross-section of 4 by 8 nm, where the longer axis corresponds to a finite number, N ? 15,…
sergio.rodrigues@xenocs.com
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechnique

Gradient supramolecular interactions and tunable mechanics in polychaete jaw inspired semi-interpenetrating networks

Thompson, Chase B.; Chatterjee, Sourav; Korley, LaShanda T. J.

Polychaete worms display a remarkable jaw structure, where a gradient in metal-ligand coordination down the length of the jaw results in a shift from hard to soft mechanics. To mimic these gradient structures, a Zn-coordinated supramolecular polymer is crosslinked into a covalent matrix to afford supramolecular semi-interpenetrating networks (SIPNs). These…
sergio.rodrigues@xenocs.com
27 January 2020
ApplicationCharacterizationCustomer publicationsFibersFractal dimensionMaterialPhase analysisProteins & DNA/RNASAXSSelf-assembled materialStructural biologyTechniqueWAXS

Aggregation behavior of the amyloid model peptide NACore

Pallbo, Jon; Sparr, Emma; Olsson, Ulf

The aggregation of the 11 residue long NACore peptide segment of ?-synuclein (68-GAVVTGVTAVA-78) has been investigated using a combination of cryogenic transmission electron microscopy (cryo-TEM), small- and wide-angle X-ray scattering, and spectroscopy techniques. The aqueous peptide solubility is pH dependent, and aggregation was triggered by a pH quench from pH…
sergio.rodrigues@xenocs.com
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechnique

Mechanism of stress induced crystallization of polyethylene

Yakovlev, Sergey; Fiscus, David; Brant, Pat; Butler, Jeff; Bucknall, David G.; Downing, Kenneth H.

When polymer melt is subjected to stress, molecular chains become aligned along the elongation direction. However, when polyethylene film crystallizes under stress, molecular chains frequently align perpendicular to the elongation direction. In this paper we investigate why this happens. Evaluating metallocene LLDPE film we show that under the stress lamellae…
sergio.rodrigues@xenocs.com
27 January 2020
(Natural) polymersApplicationCharacterizationCompositesCustomer publicationsMaterialParticlesPolymer researchPore size and pore size distributionSAXSShapeTechnique

Understanding the Static Interfacial Polymer Layer by Exploring the Dispersion States of Nanocomposites

Genix, Anne-Caroline; Bocharova, Vera; Carroll, Bobby; Lehmann, Michelle; Saito, Tomonori; Krueger, Susan; He, Lilin; Dieudonné-George, Philippe; Sokolov, Alexei P.; Oberdisse, Julian

The dynamic and static properties of the interfacial region between polymer and nanoparticles have wide-ranging consequences on performances of nanomaterials. The thickness and density of the static layer are particularly difficult to assess experimentally due to superimposing nanoparticle interactions. Here, we tune the dispersion of silica nanoparticles in nanocomposites by…
sergio.rodrigues@xenocs.com
27 January 2020
ApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPorous materialSAXSTechnique

Pressure-Driven Solvent Transport and Complex Ion Permeation through Graphene Oxide Membranes

Wang, Kai; Ausri, Irfani R.; Chu, Kyle A.; Seddon, Annela; Tang, Xiaowu (Shirley)

In this paper, an in-depth investigation of three graphene oxide (GO) based membranes—pure GO, Al3+ intercalated GO (Al-GO), and poly(ethylene glycol) (PEG) modified GO (PEG-GO)—is presented. Both Al-GO and PEG-GO membranes have wider interlayer d-spacing compared to pure GO, and the d-spacing size correlates well to the cross-membrane water flux…
sergio.rodrigues@xenocs.com
27 January 2020