Monthly Archives

March 2019

Customer publications

High-performance polyimide copolymer fibers derived from 5-anino-2-(2-hydroxy-4-aminobenzene)-benzoxazole: Preparation, structure and properties

Dai, Xuemin; Bao, Feng; Jiao, Long; Yao, Haibo; Ji, Xiangling; Qiu, Xuepeng; Men, Yongfeng

A series of high-performance polyimide copolymer (co-PI) fibers containing phenylenebenzoxazole moiety with one hydroxyl group are synthesized based on the copolymerization of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA) with two diamine monomers, namely, p-phenylenediamine (p-PDA) and 5-anino-2-(2-hydroxy-4-aminobenzene)-benzoxazole (p-mHBOA), through a two-step method. The molar ratio…
Xenocs
12 March 2019
ApplicationCatalystsCharacterizationCustomer publicationsInorganic materialsMaterialNanoparticles & colloidsParticle size and size distributionParticlesPhase analysisPorous materialSAXSTechnique

Highly Selective Continuous Flow Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol in a Pt/SiO2 Coated Tube Reactor

Bai, Yang; Cherkasov, Nikolay; Huband, Steven; Walker, David; Walton, Richard; Rebrov, Evgeny;

A novel continuous flow process for selective hydrogenation of α, β-unsaturated aldehyde (cinnamaldehyde, CAL) to the unsaturated alcohol (cinnamyl alcohol, COL) has been reported in a tube reactor coated with a Pt/SiO2 catalyst. A 90% selectivity towards the unsaturated alcohol was obtained at the aldehyde conversion of 98.8%. This is…
Xenocs
12 March 2019
Customer publications

High internal vegetable oil nanoemulsion: D-phase emulsification as a unique low energy process

Yukuyama, Megumi Nishitani; Oseliero, Pedro Leonidas Filho; Kato, Edna Tomiko Myiake; Lobënberg, Raimar; de Oliveira, Cristiano Luis Pinto; de Araujo, Gabriel Lima Barros; Bou-Chacra, Nadia Araci

The development of nanoscale emulsions containing high concentration of vegetable oil and low concentration of surfactant is considered challenging in conventional low-energy processes such as the Phase Inversion Temperature (PIT) and Phase Inversion Composition (PIC) methods. For the first time, a stable 20–30 nm oil-in-water nanoemulsion, containing 40.0% (w/w) olive oil…
Xenocs
12 March 2019
Customer publications

Gyroidal Porous Carbon Activated with NH3 or CO2 as Lithium−Sulfur Battery Cathodes

Krüner, Benjamin; Dörr, Tobias S.; Shim, Hwirim; Sann, Joachim; Janek, Jürgen; Presser, Volker

Ordered mesoporous carbon materials, prepared from co-assembly of a block copolymer and a commercial resol, were investigated as a sulfur host for LiS-battery cathodes. We studied two activation methods for such carbons, namely annealing in ammonia (NH3) and carbon dioxide (CO2). We found that both activation environments drastically increased the…
Xenocs
12 March 2019
Customer publications

On the colloidal stability of apolar nanoparticles: The role of particle size and ligand shell structure

Kister, Thomas; Monego, Debora; Mulvaney, Paul; Widmer-Cooper, Asaph; Kraus, Tobias

Being able to predict and tune the colloidal stability of nanoparticles is essential for a wide range of applications, yet our ability to do so is currently poor due to a lack of understanding of how they interact with one another. Here, we show that the agglomeration of apolar particles…
Xenocs
12 March 2019
Customer publications

From equilibrium lamellae to out-of-equilibrium cylinders in triblock copolymer nanolayers obtained via multilayer coextrusion

Montana, Juan-Sebastián; Roland, Sébastien; Richaud, Emmanuel; Miquelard-Garnier, Guillaume

Multilayer coextrusion was used to obtain nanolayered films of self-assembled commercial triblock copolymer poly(methyl methacrylate-b-butyl acrylate-b-methyl methacrylate) (MAM) confined by poly(methyl methacrylate) (PMMA). The MAM layer thickness was varied from 30 nm to 500 nm (i.e. roughly 1 to 15–20 nanodomains) by changing either the number of multiplying elements or the chill…
Xenocs
12 March 2019
Customer publications

D–A1–D–A2 Copolymer Based on Pyridine-Capped Diketopyrrolopyrrole with Fluorinated Benzothiadiazole for High-Performance Ambipolar Organic Thin-Film Transistors

Li, Ping; Xu, Long; Shen, Hongguang; Duan, Xianming; Zhang, Jianqi; Wei, Zhixiang; Yi, Zhengran; Di, Chong-an; Wang, Shuai

A novel donor–acceptor–donor–acceptor (D–A1–D–A2) π-conjugated copolymer (PDBPyDT2FBT) has been prepared by Stille coupling reaction. It is found that PDBPyDT2FBT exhibits low LUMO energy level mainly because of multiple electron-deficient units and donor–acceptor interaction, which is favorable to obtain more efficient electron injection and transport in organic thin-film transistors (OTFTs).…
Xenocs
12 March 2019
Customer publications

Expanded graphite as an agent towards controlling the dispersion of carbon black in poly (styrene –co-butadiene) matrix: An effective strategy towards the development of high performance multifunctional composite

Mondal, Titash; Bhowmick, Anil K.; Ghosal, Ranjan; Mukhopadhyay, Rabindra

Controlling dispersion and networking of particulate fillers in a polymer matrix is critical towards the development of high performance polymer composite. However, fabricating such a methodology at a large scale is challenging. Herein, we report an effective strategy, by which the dispersion, structure and networking behavior of a particulate filler…
Xenocs
12 March 2019
Customer publications

Equilibrium Crystallization Temperature of Syndiotactic Polystyrene γ Form

Wang, Hai; Wu, Chun-Ji; Cui, Dong-Mei; Men, Yong-Feng

The crystallization behavior of syndiotactic polystyrene (sPS) γ form undergoing annealing at various temperatures was investigated using the thermodynamic phase diagram based on Strobl’s crystallization theory. On the basis of the differential scanning calorimetric results, it was observed that γ form melt-recrystallization occurred at a higher temperature with the increasing…
Xenocs
12 March 2019
Customer publications

Enhanced lithium storage performance of hierarchical CuO nanomaterials with surface fractal characteristics

Li, Ang; He, Renyue; Bian, Zhuo; Song, Huaihe; Chen, Xiaohong; Zhou, Jisheng

Self-assembled hierarchical CuO nanostructures with fractal structures were prepared by a mild method and exhibited excellent lithium storage properties, certain of which even demonstrated a high reversible capacity of 827 mAh g−1 at a rate of 0.1 C. An interesting phenomenon was observed that the electrochemical performance varies along with the structure complexity,…
Xenocs
12 March 2019