Synthesis of High Density Insensitive Energetic Tetraazapentalene Derivatives

1995 ◽  
Vol 418 ◽  
Author(s):  
M. L. Trudell ◽  
G. Subramanian ◽  
G. Eck ◽  
J. H. Boyer
Keyword(s):  
High Density ◽  
Thermally Stable ◽  
Carbonyl Derivatives ◽  
Hammer Blow

AbstractAn improved nitration procedure has been developed for the synthesis of y-Tacot (3). The synthesis of y-DBBD (8) has been completed in three steps from 3 in 37% yield. y-DBBD (8) was found to be thermally stable up to 274 °C (decomposed) and insensitive to impact (hammer blow). Nitration of z-BDDB (6) and y-DBBD (8) gave carbonyl derivatives resulting from in situ hydroysis/oxidation of the corresponding tetranitro derivatives z-TBBD (7) and y-TBBD (9), respectively.

Thermally stable polyimide nanocomposite films from electrospun BaTiO3 fibers for high-density energy storage capacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 44749-44755 ◽  
Author(s):  
Yun-Hui Wu ◽  
Jun-Wei Zha ◽  
Zhi-Qiang Yao ◽  
Fang Sun ◽  
Robert K. Y. Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Dielectric Properties ◽  
Dispersion Polymerization ◽  
Composite Films ◽  
High Density ◽  
Nanocomposite Films ◽  
Thermally Stable ◽  
Polyimide Nanocomposite ◽  
Polymerization Method

PI composite films with electrospun BT fibers were fabricated using the in situ dispersion polymerization method. The microstructures, thermal and dielectric properties of the BT fibers and composite films were investigated.

scholarly journals Millisecond lattice gasification for high-density CO2- and O2-sieving nanopores in single-layer graphene

2021 ◽  
Vol 7 (9) ◽  
pp. eabf0116
Author(s):  
Shiqi Huang ◽  
Shaoxian Li ◽  
Luis Francisco Villalobos ◽  
Mostapha Dakhchoune ◽  
Marina Micari ◽  
...  
Keyword(s):  
Single Layer ◽  
High Density ◽  
Single Layer Graphene ◽  
Pore Density ◽  
Vacancy Defects ◽  
Carbon Gasification ◽  
Layer Graphene ◽  
Gas Molecules ◽  
Good Agreement

Etching single-layer graphene to incorporate a high pore density with sub-angstrom precision in molecular differentiation is critical to realize the promising high-flux separation of similar-sized gas molecules, e.g., CO2 from N2. However, rapid etching kinetics needed to achieve the high pore density is challenging to control for such precision. Here, we report a millisecond carbon gasification chemistry incorporating high density (>1012 cm−2) of functional oxygen clusters that then evolve in CO2-sieving vacancy defects under controlled and predictable gasification conditions. A statistical distribution of nanopore lattice isomers is observed, in good agreement with the theoretical solution to the isomer cataloging problem. The gasification technique is scalable, and a centimeter-scale membrane is demonstrated. Last, molecular cutoff could be adjusted by 0.1 Å by in situ expansion of the vacancy defects in an O2 atmosphere. Large CO2 and O2 permeances (>10,000 and 1000 GPU, respectively) are demonstrated accompanying attractive CO2/N2 and O2/N2 selectivities.

Development of heavyweight aggregate via in-situ growth of high density ceramics using red mud

2021 ◽  
Vol 313 ◽  
pp. 125376
Author(s):  
Ashutosh Singh Raghubanshi ◽  
Manish Mudgal ◽  
Anil Kumar ◽  
R.K. Chouhan ◽  
Avanish Kumar Srivastava
Keyword(s):  
Red Mud ◽  
High Density ◽  
In Situ Growth

Functional heterogeneity with respect to oestrogen treatment in prolactin cell subpopulations separated by Percoll gradient centrifugation

1994 ◽  
Vol 141 (2) ◽  
pp. 251-258 ◽  
Author(s):  
B Velkeniers ◽  
M Kazemzadeh ◽  
L Vanhaelst ◽  
E L Hooghe-Peters
Keyword(s):  
Gradient Centrifugation ◽  
High Density ◽  
Female Rats ◽  
Cell Subpopulation ◽  
Percoll Gradient ◽  
Prolactin Cell ◽  
Prolactin Gene ◽  
Prolactin Mrna

Abstract The effects of oestradiol on prolactin gene expression were studied by quantitative in situ hybridization histochemistry in different prolactin pituitary cell (sub)populations, which had been obtained by separation on a discontinuous Percoll gradient. When cells were incubated in vitro in the presence of oestradiol (10−8 m) for a period of 4, 24, 48 and 72 h, there was an increase in the amount of prolactin mRNA, from 24 h on, only in high-density prolactin cells and lactotrophs of the total cell suspension. In contrast, the amount of prolactin mRNA in lactotrophs of low density did not change upon treatment with oestradiol. Pharmacological treatment with 50 μg oestradiol/day (s.c.) of random cycling female rats in vivo for 14 days increased the total number of prolactin gene-expressing cells and more lactotrophs were recovered at high density after Percoll gradient centrifugation. These results suggest a preferential stimulatory effect of oestradiol on prolactin gene transcription on a subpopulation of lactotrophs. Changes observed in prolactin cell layers after oestradiol treatment in vivo may represent a preferential effect in situ on a particular mammotroph cell subpopulation. Journal of Endocrinology (1994) 141, 251–258

Structural evolution of flow-oriented high density polyethylene upon heating: In situ SAXS and WAXD studies

Polymer ◽  
2019 ◽  
Vol 180 ◽  
pp. 121698 ◽  
Author(s):  
Tao Liao ◽  
Xintong Zhao ◽  
Xiao Yang ◽  
Phil Coates ◽  
Ben Whiteside ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Structural Evolution ◽  
High Density

scholarly journals In-Situ Synthesis and Property Evaluation of High-Density Polyethylene Reinforced Groundnut Shell Particulate Composite

2021 ◽  
Vol 6 (4) ◽  
pp. 305-311
Author(s):  
Abdulmumin Adebisi ◽  
Tajudeen Mojisola ◽  
Umar Shehu ◽  
Muhammed Sani Adam ◽  
Yusuf Abdulaziz
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Impact Energy ◽  
High Density Polyethylene ◽  
In Situ Synthesis ◽  
High Density ◽  
Compression Moulding ◽  
Melt Mixing ◽  
Groundnut Shell

In-situ synthesis of high-density polyethylene (HDPE) reinforced groundnut shell particulate (GSP) composite with treated GSP within the range of 10-30 wt% at 10 wt% has been achieved. The adopted technique used in the production of the composite is melt mixing and compounding using two roll mills with a compression moulding machine. Properties such as hardness, tensile strength, impact energy and water absorption analysis were examined. The result revealed that addition of GSP increases the hardness value from 22.3 to 87 Hv. However, the tensile strength progressively decreased as the GSP increases in the HDPE. This trend arises due to the interaction between neighbouring reinforced particulate which appears to influence the matrix flow, thereby inducing embrittlement of the polymer matrix. It was also observed that water absorption rate steadily increased with an increase in the exposure time and the absorbed amount of water increases by increasing the wt% of the GSP. Analysing the obtained results, it was concluded that there were improvements in the hardness, tensile strength, impact energy and water absorption properties of the HDPE-GSP polymer composite when compared to unreinforced HDPE. On these premises, GSP was found as a promising reinforcement which can positively influence the HDPE properties of modern composites.

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