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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…
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…
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…
A versatile approach to different colored photonic films generated from block copolymers and their conversion into polymer-grafted nanoplatelets

Huang, Yucheng; Zheng, Yang; Pribyl, Julia; Benicewicz, Brian C.

Customer publications

A versatile approach to different colored photonic films generated from block copolymers and their conversion into polymer-grafted nanoplatelets

Huang, Yucheng; Zheng, Yang; Pribyl, Julia; Benicewicz, Brian C.

One-dimensional photonic crystals can be formed by the self-assembly of block copolymers. However, such materials are still difficult to make due to the synthetic challenge of making high molecular weight block copolymers and the slow self-assembly characteristics of these block copolymers to form high domain spacings (d > 150 nm).…
Effects of Cations on the Behaviour of Lipid Cubic Phases

Brasnett, Christopher; Longstaff, Georgia; Compton, Laura; Seddon, Annela

Customer publications

Effects of Cations on the Behaviour of Lipid Cubic Phases

Brasnett, Christopher; Longstaff, Georgia; Compton, Laura; Seddon, Annela

Inverse bicontinuous cubic structures formed by lipids have been demonstrated in a wide variety of applications, from a host matrix for proteins for crystallisation, to templates for nanoscale structures. Recent work has focused on tuning their properties to realize such applications, often by manipulating the structure by introducing other lipids…
Porous Stimuli-Responsive Self-Folding Electrospun Mats for 4D Biofabrication

Apsite, Indra; Stoychev, Georgi; Zhang, Weizhong; Jehnichen, Dieter; Xie, Jin; Ionov, Leonid

Customer publications

Porous Stimuli-Responsive Self-Folding Electrospun Mats for 4D Biofabrication

Apsite, Indra; Stoychev, Georgi; Zhang, Weizhong; Jehnichen, Dieter; Xie, Jin; Ionov, Leonid

We report fabrication and characterization of electrospun, porous multi-layer scaffolds based-on thermo-responsive polymers polycaprolactone (PCL) and poly(N-isopropylacrylamide). We found that the electrospun mats fold into various 3D structures in an aqueous environment at different temperatures. We could determine the mechanism behind different folding behaviors under different conditions by…