Category

(Natural) polymers

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchTechniqueWAXS

Pendant side-chain sterics against electrostatic forces: Influencing short-range ordering in random polyelectrolytes

Nwosu, Chinomso; Coughlin, E. Bryan

The length of pendant side chains in charged, random, comb-shaped polymers dictates the nature of their short-range ordering. Random copolymers, and terpolymer, of 4-vinylpyridine (4VP), styrene, and isoprene were synthesized and subsequently fully quaternized with 1-alkylbromides having varying number of carbons on the alkyl group ranging from 2 to 8.…
(Natural) polymersApplicationCharacterizationCustomer publicationsFractal dimensionMaterialNanoparticles & colloidsParticlesSAXSShapeSizeTechnique

Soft cellulose II nanospheres: sol–gel behaviour, swelling and material synthesis

Beaumont, Marco; Rosenfeldt, Sabine; Tardy, Blaise L.; Gusenbauer, Claudia; Khakalo, Alexey; Nonappa; Opietnik, Martina; Potthast, Antje; Rojas, Orlando J.; Rosenau, Thomas

High axial aspect crystalline nanomaterials have emerged as polymeric building blocks for the construction of supermaterials. In contrast to this form, amorphous nanospheres have remained largely untapped. This is especially peculiar in the context of material assembly, due to the wide range of opportunities they offer by virtue of their…
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOtherOtherSAXSTechniqueWAXS

Bacteria-Resistant, Transparent, Free-Standing Films Prepared from Complex Coacervates

Kurtz, Irene S.; Sui, Shuo; Hao, Xi; Huang, Mengfei; Perry, Sarah L.; Schiffman, Jessica D.

We report the fabrication, properties, and bacteria-resistance of polyelectrolyte complex (PEC) coatings and free-standing films. Poly(4-styrenesulfonic acid), poly(diallyldimethylammonium chloride), and salt were spin-coated into PEC films. After thermal annealing in a humid environment, highly transparent, mechanically strong, and chemically robust films were formed. Notably, we demonstrate…
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPolymer researchSAXSSelf-assembled materialTechniqueTemperature

Two-Step Chemical Transformation of Polystyrene-block-poly(solketal acrylate) Copolymers for Increasing ?

Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Rzayev, Javid; Russell, Thomas P.

We investigated the two-step chemical transformation of a series of symmetric poly(styrene-b-solketal acrylate) (PS-b-PSA) copolymers with varying molecular weights from 1900 to 27?300 g/mol (13 ? N ? 194) synthesized by sequential atom transfer radical polymerization. Through acid-catalyzed hydrolysis, the PSA block is converted into poly(glycerol acrylate) (PGA), which subsequently…
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchTechniqueWAXS

Multi-scale modelling approach to homogenise the mechanical properties of polymeric closed-cell bead foams

Gebhart, Thomas M. J.; Jehnichen, Dieter; Koschichow, Roman; Müller, Michael; Göbel, Michael; Geske, Vinzenz; Stegelmann, Michael; Gude, Maik

The complex mechanical deformation behaviour of closed-cell foams is governed by morphological and physical properties such as cell structure and crystallinity. In this study, the micro-, meso- and macroscopic scale of commercially available bead foam was analysed. Statistical distribution of the cell structure including cell size, wall thickness and shape…
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSTechniqueTemperature

Tuning Mechanical Properties of Biobased Polymers by Supramolecular Chain Entanglement

Lamm, Meghan E.; Song, Lingzhi; Wang, Zhongkai; Rahman, Md Anisur; Lamm, Benjamin; Fu, Lin; Tang, Chuanbing

A variety of biobased polymers have been derived from diverse natural resources. However, the mechanical properties of some of these polymers are inferior due to low chain entanglement. We report a facile strategy termed “supramolecular chain entanglement”, which utilizes supramolecular interactions to create physical cross-linking and entanglements for polymers with…
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialNanoparticles & colloidsParticlesSAXSShapeSizeTechniqueTemperature

Investigation of the internal structure of thermoresponsive diblock poly(2-methyl-2-oxazoline)-b-poly[N-(2,2-difluoroethyl)acrylamide] copolymer nanoparticles

Babuka, David; Kolouchova, Kristyna; Hruby, Martin; Groborz, Ondrej; Tosner, Zdenek; Zhigunov, Alexander; Stepanek, Petr

The poly(2-methyl-2-oxazoline)-b-poly self-assembled nanoparticles show great potential in biological applications as, e.g., 19F MRI tumour diagnostic agents. As such their internal structure needs to be thoroughly investigated while the results also help to understand temperature-dependent self-assembly behaviour of copolymers comprised of the hydrophilic and…
(Natural) polymersApplicationCharacterizationCompositesCustomer publicationsMaterialOtherPolymer researchSAXSTechnique

Tunable Fluorophobic Effect Determines Nanoparticle Dispersion in Homopolymers and Block Polymers

Marsh, Zachary M.; Blom, Douglas A.; Stefik, Morgan

The controlled placement of nanoparticles (NPs) within homopolymers and block polymers is of broad interest for functional nanomaterials. This manuscript focuses on small molecule-stabilized NPs that bring a large fraction of functionality. For such NP mixtures with block polymers, the overwhelming focus to date has been the use of attractive…
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialPhase analysisRenewable energySAXSTechnique

Enhanced Conductivity via Homopolymer-Rich Pathways in Block Polymer-Blended Electrolytes

Morris, Melody A.; Sung, Seung Hyun; Ketkar, Priyanka M.; Dura, Joseph A.; Nieuwendaal, Ryan C.; Epps, Thomas H.

The optimization of ionic conductivity and lithium-ion battery stability can be achieved by independently tuning the ion transport and mechanical robustness of block polymer (BP) electrolytes. However, the ionic conductivity of BP electrolytes is inherently limited by the covalent attachment of the ionically conductive block to the mechanically robust block,…
(Natural) polymersApplicationCharacterizationCompositesCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechnique

Comparative Study of Direct Compounding, Coupling Agent-Aided and Initiator-Aided Reactive Extrusion to Prepare Cellulose Nanocrystal/PHBV (CNC/PHBV) Nanocomposite

Zheng, Ting; Clemons, Craig M.; Pilla, Srikanth

Three compounding methods were compared to determine their effects on the organization of the interphase in nanocomposites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and cellulose nanocrystals (CNCs) processed via (1) direct compounding, (2) reactive extrusion using a coupling agent (PHBV-g-GMA), or (3) reactive extrusion using a peroxide free-radical initiator (dicumyl peroxide,…