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Deformation X-ray study of propylene-based elastomers with controlled sequence distributions

Lu, Yonglai; Norman, Alexander I.; Tsou, Andy H.; Hagadorn, John R.; Hsiao, Benjamin S.

Customer publications

Deformation X-ray study of propylene-based elastomers with controlled sequence distributions

Lu, Yonglai; Norman, Alexander I.; Tsou, Andy H.; Hagadorn, John R.; Hsiao, Benjamin S.

Three iso-specific organometallic catalysts for ethylene and propylene copolymerization with varying products of ethylene and propylene reactivity ratios were utilized to synthesize equal-molecular-weight propylene-based elastomers (PBEs) of alternating (aPBE), random (rPBE), and blocky (bPBE) backbone sequences. To compensate for the variations in catalyst iso-specificity, the ethylene content…
Dynamic glass transition of the rigid amorphous fraction in polyurethane-urea/SiO2 nanocomposites

Koutsoumpis, Stefanos; Raftopoulos, Konstantinos N.; Oguz, Oguzhan; Papadakis, Christine M.; Menceloglu, Yusuf Z.; Pissis, Polycarpos

Customer publications

Dynamic glass transition of the rigid amorphous fraction in polyurethane-urea/SiO2 nanocomposites

Koutsoumpis, Stefanos; Raftopoulos, Konstantinos N.; Oguz, Oguzhan; Papadakis, Christine M.; Menceloglu, Yusuf Z.; Pissis, Polycarpos

We report molecular dynamics in the rigid amorphous fraction (RAF) of the polymer bound at the interfaces with nanoparticles in polymer nanocomposites and calculate the glass transition temperature, Tg, for this bound layer of polymer. We follow the ‘3-phase-model’ for semicrystalline polymers where the polymer matrix consists of the crystalline…
Structural analysis of Ioncell-F fibres from birch wood

Asaadi, Shirin; Hummel, Michael; Ahvenainen, Patrik; Gubitosi, Marta; Olsson, Ulf; Sixta, Herbert

Customer publications

Structural analysis of Ioncell-F fibres from birch wood

Asaadi, Shirin; Hummel, Michael; Ahvenainen, Patrik; Gubitosi, Marta; Olsson, Ulf; Sixta, Herbert

Quite recently, the Ioncell-F process, a novel and promising Lyocell fibre process, has been developed. The ionic liquid 1,5-diazabicyclonon-5-enium acetate (OAc) utilized in this process, was identified as an excellent cellulose solvent for dry-jet wet fibre spinning. Fibres spun from cellulose-OAc solution have shown excellent mechanical properties. Herein, various structural…
Matrix-Free Polymer Nanocomposite Thermoplastic Elastomers

Huang, Yucheng; Zheng, Yang; Sarkar, Amrita; Xu, Yanmei; Stefik, Morgan; Benicewicz, Brian C.

Customer publications

Matrix-Free Polymer Nanocomposite Thermoplastic Elastomers

Huang, Yucheng; Zheng, Yang; Sarkar, Amrita; Xu, Yanmei; Stefik, Morgan; Benicewicz, Brian C.

Thermoplastic elastomer (TPE) grafted nanoparticles were prepared by grafting block copolymer poly(styrene-block-(n-butyl acrylate)) onto silica nanoparticles (NPs) via surface-initiated reversible addition–fragmentation chain transfer (RAFT) polymerization. The effects of polymer chain length and graft density on the mechanical properties were investigated using films made solely from the…
Can high oxygen and water vapor barrier nanocomposite coatings be obtained with a waterborne formulation?

Tsurko, Evgeny S.; Feicht, Patrick; Habel, Christoph; Schilling, Theresa; Daab, Matthias; Rosenfeldt, Sabine; Breu, Josef

Customer publications

Can high oxygen and water vapor barrier nanocomposite coatings be obtained with a waterborne formulation?

Tsurko, Evgeny S.; Feicht, Patrick; Habel, Christoph; Schilling, Theresa; Daab, Matthias; Rosenfeldt, Sabine; Breu, Josef

Modification of synthetic, high aspect ratio clay with 6-aminocaprohydroxamic acid hydrochloride pushes the interaction between the polyvinyl alcohol (PVA) matrix and the filler to the level where the waterborne nanocomposite becomes rather insensitive to swelling, even at an elevated relative humidity (RH). The modifier can form strong hydrogen bonds with…
Nanorattles with tailored electric field enhancement

Schnepf, Max J.; Mayer, Martin; Kuttner, Christian; Tebbe, Moritz; Wolf, Daniel; Dulle, Martin; Altantzis, Thomas; Formanek, Petr; Förster, Stephan; Bals, Sara; König, Tobias A. F.; Fery, Andreas

Customer publications

Nanorattles with tailored electric field enhancement

Schnepf, Max J.; Mayer, Martin; Kuttner, Christian; Tebbe, Moritz; Wolf, Daniel; Dulle, Martin; Altantzis, Thomas; Formanek, Petr; Förster, Stephan; Bals, Sara; König, Tobias A. F.; Fery, Andreas

Nanorattles are metallic core–shell particles with core and shell separated by a dielectric spacer. These nanorattles have been identified as a promising class of nanoparticles, due to their extraordinary high electric-field enhancement inside the cavity. Limiting factors are reproducibility and loss of axial symmetry owing to the movable metal core;…