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(Natural) polymers

Gas separation properties of polybenzimidazole/thermally-rearranged polymer blends

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

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

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

(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…
Mechanism of stress induced crystallization of polyethylene

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

(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…
Nafion/Protic Ionic Liquid Blends: Nanoscale Organization and Transport Properties

Danyliv, Olesia; Martinelli, Anna

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialRenewable energySAXSSpecific surfaceTechnique

Nafion/Protic Ionic Liquid Blends: Nanoscale Organization and Transport Properties

Danyliv, Olesia; Martinelli, Anna

In this work, the possibility of using the protic ionic liquids N-ethylimidazolium trifluoromethylsulfonate, , and N-ethylimidazolium bis(trifluoromethylsulfonyl)imide, , as charge carriers in appropriately modified Nafion membranes has been investigated. The superior thermal stability of ionic liquids, as compared to that of water-based electrolytes, hypothetically offers a…
Adjustable self-assembly in polystyrene-block-poly(4-vinylpyridine) dip-coated thin films

Konefa?, Magdalena; Zhigunov, Alexander; Pavlova, Ewa; ?ernoch, Peter; Pop-Georgievski, Ognen; Špírková, Milena

(Natural) polymersApplicationCharacterizationCustomer publicationsGISAXSMaterialPhase analysisPolymer researchSAXSShapeSizeSurface structure and patternsTechnique

Adjustable self-assembly in polystyrene-block-poly(4-vinylpyridine) dip-coated thin films

Konefa?, Magdalena; Zhigunov, Alexander; Pavlova, Ewa; ?ernoch, Peter; Pop-Georgievski, Ognen; Špírková, Milena

This work studies the influence of dip-coating parameters on self-assembly in ultra-thin films of asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) copolymers from a 1-chloropentane solution using a combination of several experimental techniques. Small-Angle X-ray Scattering, Atomic Force Microscopy, Grazing Incidence Small Angle X-ray Scattering and Transmission Electron Microscopy…
Widely tunable persistent micelle templates via homopolymer swelling

Sarkar, Amrita; Thyagarajan, Akshay; Cole, August; Stefik, Morgan

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPorous materialRenewable energySAXSSelf-assembled materialTechnique

Widely tunable persistent micelle templates via homopolymer swelling

Sarkar, Amrita; Thyagarajan, Akshay; Cole, August; Stefik, Morgan

The combination of precision control with wide tunability remains a challenge for the fabrication of porous nanomaterials suitable for studies of nanostructure–behavior relationships. Polymer micelle templates broadly enable porous materials, however micelle equilibration hampers independent pore and wall size control. Persistent micelle templates (PMT) have emerged as a kinetic controlled