Effects of Cross-Linking Agents on Synthesis of Heat-Resistant Resin from Ethylene Tar

2012 ◽  
Vol 217-219 ◽  
pp. 1159-1165 ◽  
Author(s):  
Yang Yang Shi ◽  
Ming Bo Wu ◽  
Yu Wei Wang ◽  
Shi Bin Li
Keyword(s):  
Molecular Structure ◽  
Heat Resistance ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Crosslinking Agent ◽  
Raw Material ◽  
Cross Linking ◽  
Structure Parameters ◽  
Ft Ir ◽  
Graphite Composites

Ethylene tar (ET) was utilized as raw material, 1,4-benzenedimethanol and trioxane as crosslinking agent to prepare condensed poly-nuclear aromatic resin (COPNAR). FT-IR, 1H-NMR, TGA, elemental analysis, and improved Brown-Ladner calculation were systematically conducted for ET, COPNAR, and COPNAR/graphite composites prepared via graphite molding. The ET average molecular structure parameters were calculated using improved Brown-Ladner method, the crosslinking agent was found an important factor for the COPNAR synthesis, and the obtained COPNAR and CONPAR/graphite composites exhibited highly beneficial heat resistance.

Bimetallic Group 6 Tricarbonyls Triply-Bridged by Bis(phenylthio)alkane Bidentate Ligands

2010 ◽  
Vol 93-94 ◽  
pp. 13-16
Author(s):  
Khalil J. Asali
Keyword(s):  
1H Nmr ◽  
Elemental Analysis ◽  
Thermodynamic Stability ◽  
Chlorinated Hydrocarbons ◽  
Metal Center ◽  
Molar Ratio ◽  
Bidentate Ligands ◽  
Group 6 ◽  
Ft Ir

Reactions of the labile complex (Me3tach)M(CO)3 (Me3tach = 1,3,5-trimethyl-1,3,5-triazacyclohexane; M = W, Mo) with bis(phenylthio)alkanes ( = PhS(CH2)nSPh), (2:3 molar ratio) in CH2Cl2 as solvent (at 35 oC M = W, 0 oC M = Mo) afforded in good yields bimetallic tricarbonyl complexes triply- bridged by bis(phenylthio)alkanes of the type [M(CO)3]2(μ-PhS-(CH2)n-SPh)3 [n = 3 (a), 4 (b), 5 (c), 6 (d); M = W (1), Mo (2)]. These new triply-bridged complexes were characterized by 1H NMR, FT-IR and elemental analysis. Additionally, it has been observed that the thermodynamic stability of some of these new complexes in chlorinated hydrocarbons depends mainly on the nature of the metal center and varies in the order W >> Mo.

scholarly journals Synthesis, Anticonvulsant and Neurotoxicity Screening of Some Novel 2, 5-Disubstituted - 1, 3, 4 � Oxadiazole Derivatives

2017 ◽  
Vol 9 (01) ◽  
Author(s):  
Y. Khatoon ◽  
M. Shaquiquzzaman ◽  
V. Singh ◽  
M. Sarafroz
Keyword(s):  
Sodium Hydroxide ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Neurological Deficit ◽  
Anticonvulsant Activity ◽  
Sodium Hydroxide Solution ◽  
Maximal Electroshock ◽  
Rota Rod Test ◽  
Oxadiazole Derivatives ◽  
Ft Ir

A series of 2, 5-disubstituted - 1, 3, 4 oxadiazoles (4a-o) were synthesized on refluxing hydrazine carbothioamides with iodine and potassium iodide in ethanolic sodium hydroxide solution starting from methyl-3-amino-4-hydroxy benzoate via synthesis of an intermediate methyl-2-substitutedaryl-1, 3-benzoxazole-5-carboxylates and 2-substitutedaryl-1, 3-benzoxazole-5-carbohydrazides. The newly synthesized compounds were characterized on the basis of spectral (FT-IR, 1H-NMR, MS) and elemental analysis. All these compounds were screened for anticonvulsant activity using Maximal Electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) method. Anticonvulsant activity was shown by majority of the synthesized compounds when given i.p. to mice. Among the tested compounds 4e, 4j and 4o were considered to have potent anticonvulsant activity comparable to that of standard drugs Phenytoin and Carbamazepine. Compounds 4e, 4g, 4h, 4i, 4k and 4m passed the rota rod test successfully without any sign of neurological deficit.

Perfluoropolyether Modified Waterborne Shape Memory Polyurethaneurea Ionomers for Potential Medical Implant Application

2012 ◽  
Vol 499 ◽  
pp. 53-57
Author(s):  
Qun Xia Li ◽  
Zhong Yu Hou
Keyword(s):  
Molecular Structure ◽  
Differential Scanning Calorimetry ◽  
Transition Temperature ◽  
Shape Memory ◽  
Soft Segment ◽  
Cross Linking ◽  
Isophorone Diisocyanate ◽  
Scanning Calorimetry ◽  
Weight Percentage ◽  
Ft Ir

A series of cross-linked fluorinated waterborne shape memory polyurethaneurea (PUU) ionomers were synthesized from polycaprolactone diol, perfluoropolyether diol (PFPE), dimethylolproionic acid, isophorone diisocyanate, ethylenediamine (EDA) and diethylenetriamine (DETA). The effect of PFPE content in the soft segment and the degree of cross-linking on the molecular structure and the properties of for these PUU films was examined and studied. Differential scanning calorimetry showed that the transition temperature for these Tm type shape memory PUU could be facially tuned by PFPE weight percentage and EDA/DETA ratio in the range between 30°C to 50°C, in the vicinity of body temperature. The dependence of their properties on hydrogen-bonds evaluated by FT-IR was also discussed.

scholarly journals SYNTHESIS N-PHENYLAMINEDITHIOCARBAMATE AS CHELATING AGENT IN SOLVENT EXTRACTION

2014 ◽  
Vol 2 (3) ◽  
Author(s):  
Soja Siti Fatimah ◽  
Vera Musfiroh ◽  
Zackiyah Zackiyah ◽  
Husein H. Bahti ◽  
Iwan Hastiawan ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Solvent Extraction ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Carbon Disulphide ◽  
Chelating Agent ◽  
Dithiocarbamate Derivatives

Dithiocarbamate derivatives is a versatile ligand that contain two atoms of sulfur as a strong electrondonor. It combines with metals. N-phenylaminedithiocarbamate has synthesized and applied in solvent exctration. Synthesis carried out with addition carbon disulphide to N-phenylamine and concentrated pottasium hydroxyde in metanol. The result was characterized by spectroscopy 1H-NMR, 13C-NMR, FTIR, Elemental Analysis, that showed molecular structure was significant. Applied N-Phenylaminedithiocarbamate in solvent extraction showed precent of result Cu(II), Co(II), Cr(III) and Ni (II) were 90.45% - 99.99% at pH 4-9.

Preparation of Novel Intermediate Material for Azobenzene Liquid Crystal

2014 ◽  
Vol 584-586 ◽  
pp. 1665-1668
Author(s):  
Hong Wei Wang ◽  
Jian Wei Ren ◽  
Yuan Yuan Li ◽  
Xin Zhang ◽  
Zong Cheng Miao
Keyword(s):  
Liquid Crystal ◽  
1H Nmr ◽  
Raw Material ◽  
Conversion Degree ◽  
Chemical Structures ◽  
Ft Ir ◽  
Important Intermediate ◽  
Synthetic Intermediate ◽  
Potassium Peroxymonosulfate

An novel intermediate of (4-Iodo-phenyl)-(4-trifluoromethyl-phenyl)-diazene for azobenzene liquid crystal was synthesized. 4-Trifluoromethyl-phenylamine as raw material was oxidized by Oxone (Potassium peroxymonosulfate) in CH2Cl2/H2O solvent to synthesize 1-Nitro-4-trifluoromethyl-benzene (m1). The effect of Oxone amount on the conversion degree of raw material was discussed in ditail. Then m1 was coupled with 4-Iodo-phenylamine to obtain the important intermediate, yellow solid, the yield was 52%. The chemical structures of synthetic intermediate was confirmed by FT-IR and 1H-NMR.

scholarly journals Synthesis, Characterization and Photo-Physical Properties of Europium(III) and Terbium(III) Complexes with Thiosemicarbazones

2020 ◽  
Vol 32 (4) ◽  
pp. 952-958
Author(s):  
Ananya Vishwakarma ◽  
S.K. Sengupta ◽  
O.P. Pandey
Keyword(s):  
Physical Properties ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Emission Spectra ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
X Ray ◽  
Intense Peak ◽  
Ft Ir

Europium(III) and Terbium(III) complexes of type [Eu(L)Cl(H2O)2] and [Tb(L)OAc(H2O)2] (H2L = thiosemicarbazone ligands derived from substituted thiosemicarbazide and benzil/diacetyl) were synthesized. The ligands and synthesized complexes were characterized on the basis of elemental analysis, FT-IR and 1H NMR and X-ray diffraction studies. Photo-physical properties such as excitation spectra, emission spectra and luminescence curves of complexes were investigated. The most intense peak of Eu3+ ion found at 618 nm attributed to 5D0 → 7F2 transition and peak of Tb3+ ion at 549 nm attributed to 5D4 →7F5 transition.

scholarly journals 4,4′-Di-tert-butyl-2,2′-bipyridinium Trifluoromethanesulfonate

Molbank ◽  
10.3390/m1261 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1261
Author(s):  
Shintaro Kodama ◽  
Kazuki Bunno ◽  
Akihiro Nomoto ◽  
Akiya Ogawa
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Diethyl Ether ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Trifluoromethanesulfonic Acid ◽  
Simple Method ◽  
Tert Butyl ◽  
Ft Ir ◽  
Direct Use

4,4′-di-tert-butyl-2,2′-bipyridinium trifluoromethanesulfonate was synthesized by stirring 4,4′-di-tert-butyl-2,2′-bipyridine with scandium(III) trifluoromethanesulfonate in acetonitrile, followed by precipitation with diethyl ether. The structure of the new compound was characterized by FT-IR, 1H, 13C{1H} and 19F{1H} NMR spectroscopy and CHN elemental analysis. This is a safe and simple method to obtain mono-protonated bipyridinium trifluoromethanesulfonate without the direct use of trifluoromethanesulfonic acid.

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