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Ding X.,Beijing Institute of Technology | Ding X.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Shu Y.,Beijing Institute of Technology | Shu Y.,State Key Laboratory of Fluorine and Nitrogen Chemicals | And 11 more authors.
Central European Journal of Energetic Materials | Year: 2017

The novel fuel additive LiBH4 was introduced as an energetic component for its outstanding hydrogen content, perfect burning performance and high reactivity. In order to limit the hygroscopicity and to improve the stability in the air, LiBH4 was coated on the surface with wax and polyester carbonate. The final product was characterized by scanning electron microscopy (SEM), X-ray photoelectron energy spectroscopy (XPS) and Raman spectroscopy, while the stability in air was investigated by regular checking of variations in weight. The results show that a uniform coating layer was formed on the surface of the LiBH4, and the coverage was estimated from the boron content as approximately 82%. A healing effect was confirmed on defective surfaces exposed to air; the coating layer improves the relative stability by 50.7%. Furthermore, LiBH4 as an additive to promote the thermal decomposition of 1,3,5-trinitro-1,3,5-trazinane (RDX) and ammonium perchlorate (AP) was explored by differential scanning calorimetry (DSC), in which the catalytic effects of pure LiBH4 and coated LiBH4 were compared, and indicated that the coating does not decrease the reactivity of LiBH4. It is suggested that surface coating with some inert materials is a simple and effective method for improving the storage and performance of LiBH4, while ensuring its reactivity. © 2017 Institute of Industrial Organic Chemistry, Poland.


Hu M.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Hu M.,Xi'an Modern Chemistry Research Institute | Hu M.,University of Central Florida | An Z.,State Key Laboratory of Fluorine and Nitrogen Chemicals | And 8 more authors.
Journal of Materials Chemistry C | Year: 2016

The synthesis and characterization of new 2,2-difluorovinyloxyl terminated tolane liquid crystals are reported. The mesomorphic properties, mid-wave infrared (MWIR) absorption and birefringence were investigated. The results show that these materials exhibit low absorption loss, a wide nematic phase range, a low melting point and high birefringence. The influences of fluorine substitution and terminal groups were discussed. Moreover, a room temperature eutectic mixture is formulated with relatively high birefringence (Δn = 0.254 at λ = 4 μm), modest dielectric anisotropy (Δϵ = 2.37), low viscosity (182.9 mPa s) and a low absorption coefficient in the 3-5 μm region. © 2016 The Royal Society of Chemistry.


Zheng X.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Zheng X.,Xi'an Modern Chemistry Research Institute | Wang H.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Wang H.,Xi'an Modern Chemistry Research Institute | And 2 more authors.
RSC Advances | Year: 2016

A new amphiphilic platinum(ii) complex containing a quaternary ammonium group had been synthesized successfully. Of interest is that its monomer and excimer emission could be systematically controlled by the incorporation of a cationic surfactant, which led to a morphological transformation from fibers to ribbons then to sheets. © 2016 The Royal Society of Chemistry.


Yang Z.-Q.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Yang Z.-Q.,Xi'an Modern Chemistry Research Institute | Kou L.-G.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Kou L.-G.,Xi'an Modern Chemistry Research Institute | And 6 more authors.
Fluid Phase Equilibria | Year: 2016

This paper presents the measurements of isothermal vapor-Liquid equilibria (VLE) data for two binary systems of 2,3,3,3-tetrafluoropropene (HFO-1234yf) + 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) + 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb). The measurements were performed with an apparatus based on the static-analysis method. The HFO-1234yf + HCFO-1233xf system was measured at three temperatures from (293.15 to 313.15) K, and the HCFO-1233xf + HCFC-244bb system was measured at three temperatures from (303.15 to 323.15) K. The system of HFO-1234yf + HCFO-1233xf shows a small deviation from Raoult's law and dose not exhibit azeotropic behavior, while the system of HCFO-1233xf + HCFC-244bb exhibits near azeotropic behavior within the complete range of composition. All of the experimental data were correlated with the Peng-Robinson equations of state with the van der Waals mixing rules. Good consistency was obtained between the experimental data and correlated values for the both systems in the experimental temperature range. Thermodynamic consistency testing was also performed by the data-reduction method for the observed experimental data. © 2016 Elsevier B.V.

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