• Title/Summary/Keyword: 2-diamine

Search Result 361, Processing Time 0.024 seconds

Pervaporation Separation of Trace Dicholoromethane from Water Using Fluorinated Polysiloxaneimide do Membranes (불소계 폴리실록산이미드 공중합체막을 이용한 저농도 Dichloromethane 수용액의 투과증발)

  • Kim, Jeong-Hoon;Chang, Bong-Jun;Lee, Soo-Bok
    • Membrane Journal
    • /
    • v.17 no.3
    • /
    • pp.184-190
    • /
    • 2007
  • This study reports on the pervaporation separation of a volatile organic compound(VOC), dichloromethane(DCM) from water using fluorinated copolysiloxaneimide membranes. The copolysiloxaneimide membranes were prepared from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride(6FDA) and two diamines(polysiloxane diamine(SIDA), 2-(perfluorohexyl)ethyl-3,5-diaminobenzene(PFDAB)). By varying the ratio of flexible polysiloxane diamine(SIDA)/rigid fluorinated aromatic diamine(PFDAB) from 0/100 to 100/0 mol%, five copolysiloxaneimide membranes were prepared success- fully. The pervaporation properties of DCM/water were examined in terms of two diamine monomer ratio at room temperature and the feed composition of 0.05 wt% in water. It was found that the increase in SIDA content led to high permeation flux and pervaporation selectivity towards DCM by the enhanced sorption/sorption selectivity and diffusion coefficient/diffusion selectivity due to the increased hydrophobicity and fractional free volume.

Synthesis of Polyimide Derived from 4-Methyl-1,2-phenylene Bis(4-aminobenzoate) and 4,4'-Hexafluoroisopropylidenediphthalic Anhydride

  • Byung Hyun Ahn
    • Elastomers and Composites
    • /
    • v.58 no.1
    • /
    • pp.26-31
    • /
    • 2023
  • Aromatic diamine containing ortho catenation and methyl group was synthesized from 4-methyl catechol and 4-nitrobenzoyl chloride. Subsequently, a poly(amic acid) was prepared by reacting 4-methyl-1,2-phenylene bis(4-aminobenzoate) with 4,4'-hexafluoroisopropylidenediphthalic anhydride (6FDA). The resulting poly(amic acid) was transformed into a polyimide through chemical imidization. The polyimide formed was soluble in N-methyl-2-pyrrolidone (NMP) and could be cast into a flexible, transparent film. Furthermore, the polyimide exhibited a 5% weight loss at 380 ℃ in the nitrogen atmosphere.

Synthesis of Polyimide from Diamine Containing 4-tert-Butyl Group

  • Byung Hyun Ahn
    • Elastomers and Composites
    • /
    • v.59 no.3
    • /
    • pp.91-96
    • /
    • 2024
  • A novel aromatic polyimide containing the 4-tert-butyl group was prepared from 4-tert-butyl-1,2-phenylene bis(4-aminobenzoate) and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). 4-tert-Butyl-1,2-phenylene bis(4-aminobenzoate) was synthesized from 4-tert-butyl catechol and 4-nitrobenzoyl chloride. The poly(amic acid) was transformed into a polyimide via chemical imidization. The polyimide was soluble in N-methyl-2-pyrrolidone (NMP) and could be cast into a flexible and transparent film. The thermal stability of the polyimide was decreased slightly due to the pendant tertbutyl group.

The Preparation and the Gas Permeation Characteristics of the Soluble Polyimides (용해성 폴리이미드의 제조 및 기체투과특성)

  • Chun, Kyoung-Yong;Kim, Han-Sung;Han, Hak-Soo;Joe, Yung-il
    • Applied Chemistry for Engineering
    • /
    • v.9 no.2
    • /
    • pp.306-310
    • /
    • 1998
  • The soluble polyimides(PMDA/diamine/dianhydride) were prepared and investigated. After coating the prepared PMDA/diamine/dianhydride solution into the commercial tubular alumina ceramic membranes, gas permeation characteristics was investigated. $T_g{\prime}s$ of the polyimides were in the range of $337{\sim}358^{\circ}C$ and thermal stability was good. The polymer was soluble in NMP, DMAc, DMSO, THF, and m-cresol. The adhesion between the alumina membrane and the soluble polyimide was excellent. The soluble polyimide/alumina membranes containing 6FDA showed the highest permeability among others. The permeability of nitrogen of PMDA/1,3PDA/6FDA-alumina membrane was about $7.6{\times}10^{-7}(mol/m^2{\cdot}Pa{\cdot}s)$ in the gas permeation experiments. The ideal separation factor of $O_2/N_2$ and $H_2/N_2$ in PMDA/1,3PDA/6FDA-alumina membrane were 6.19, and 70.0, respectively.

  • PDF

Synthesis and Structural Characterization of Transition Metal Complex with N,N'-bis-[2(S) -pyrrolidinylmethyl]phenylene-1,2-diamine (N,N'-Bis[2(S)-2-pyrrolidinylmethyl]phenylene-1,2-diamine를 배위하는 전이금속 착물의 합성 및 구조적 특성)

  • Kim, Dong-Yeub
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.1 no.1
    • /
    • pp.43-49
    • /
    • 1998
  • The SS-phpm 4HCl(N,N'-bis-[2(S)-pyrrolidinylmethyl]phenylene-l,2-diamine-4-Hydrochloride) ligand having stereospecificity has been prepared and reacted with trans-[$Co(pyridine)_4Cl_2]$Cl. The resultants are purple crystals, which are identified to be ${\Delta}$-cis-${\beta}$-[$Co(SS-phpm)Cl_2$]Cl by elemental analysis and UV/Vis- and CD-absorption spectra, The conformation of SS-phpm in ${\Delta}$-cis-${\beta}$ complex is ${\delta}$ ${\varepsilon}$ ${\lambda}$ (SSSS) for each of the five-membered chelated ring. Futhermore, according to orientation of secondary amine, total strain energy on each isomers was calculated by molecular mechanics(MM) to verify structural characterization and spectral data. As the result, the most stabilized isomer was ${\Delta}$-cis-${\beta}$(SSSS). The value of total strain energy(U) of ${\Delta}$-cis-${\beta}$(SSSS) isomer was 63.21 kcal/mol, respectively.

  • PDF

Lead(II)-selective Polymeric Electrode Using a Schiff Base Complex of N,N'-Bis-thiophene-2-ylmethylene-ethane-1,2-diamine as an Ion Carrier

  • Jeong, Tae-Jun;Jeong, Dae-Cheol;Lee, Hyo-Kyoung;Jeon, Seung-Won
    • Bulletin of the Korean Chemical Society
    • /
    • v.26 no.8
    • /
    • pp.1219-1224
    • /
    • 2005
  • We prepared lead ion-selective PVC membranes that were based on N,N'-bis-thiophene-2-ylmethylene-ethane-1,2-diamine as a membrane carrier. The membrane electrode has a linear dynamic range between 1.0 ${\times}$ $10^{-5}$ and 1.0 ${\times}$ $10^{-1}$ M with a Nernstian slope of 29.79 mV per decade, and its detection limit was 2.04 ${\times}$ $10^{-6}$ M at room temperature. The potentiometric response is independent of the pH of the solution in the pH range of 5-7. The proposed electrode revealed good selectivity and response for $Pb^{2+}$ over a wide variety of other metal ions in pH 5.0 buffer solutions, and there was good reproducibility of the base line on the subsequent measurements. The membrane electrode has a relatively fast response time, satisfactory reproducibility and a relatively long life time.

Polymeric Membrane Silver-ion Selective Electrodes Based on Schiff Base N,N'-Bis(pyridin-2-ylmethylene)benzene-1,2-diamine

  • Seo, Hyung-Ran;Jeong, Eun-Seon;Ahmed, Mohammad Shamsuddin;Lee, Hyo-Kyoung;Jeon, Seung-Won
    • Bulletin of the Korean Chemical Society
    • /
    • v.31 no.6
    • /
    • pp.1699-1703
    • /
    • 2010
  • The Schiff base N,N'-bis(pyridin-2-ylmethylene)benzene-1,2-diamine [BPBD] has been synthesized and explored as ionophore for preparing PVC-based membrane sensors selective to the silver ($Ag^+$) ion. Potentiometric investigations indicate high affinity of this receptor for silver ion. The best performance was shown by the membrane of composition (w/w) of ionophore: 1 mg, PVC: 33 mg, o-NPOE: 66 mg and additive were added 50 mol % relative to the ionophore in 1 mL THF. The sensor works well over a wide concentration range $1{\times}10^{-3}$ to $1.0{\times}10^{-7}$ M by pH 6 at room temperature (slope 58.6 mV/dec.) with a response time of 10 seconds and showed good selectivity to silver ion over a number of cations. It could be used successfully for the determination of silver ion content in environmental and waste water samples.

Anti-Inflammatory Effects of N1-Benzyl-4-Methylbenzene-1,2-Diamine (JSH-21) Analogs on Nitric Oxide Production and Nuclear Factor-kappa B Transcriptional Activity in Lipopolysaccharide-Stimulated Macrophages RAW 264.7

  • Min, Kyung-Rak;Shin, Hyun-Mo;Lee, Jee-Hyun;Kim, Byung-Hak;Chung, Eun-Yong;Jung, Sang-Hun;Kim , Young-Soo
    • Archives of Pharmacal Research
    • /
    • v.27 no.10
    • /
    • pp.1053-1059
    • /
    • 2004
  • $N^1$-Benzyl-4-methylbenzene-1,2-diamine (JSH-21) and its analogs were chemically synthesized and their anti-inflammatory potentials investigated. JSH-21 inhibited nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated macrophages RAW 264.7 in a dose-dependent manner, with an $IC_{50}$ value of 9.2 ${\mu}M$, where pyrrolidine dithiocarbamate and parthenolide as positive controls exhibited $IC_{50}$ values of 29.3 and 3.6 ${\mu}M$, respectively. The inhibitory effect of JSH-21 on the NO production was attributable to its down-regulatory action on LPS-inducible NO synthase (iNOS), which was documented by iNOS promoter activity. In the mechanism of the anti-inflammatory action, JSH-21 exhibited inhibitory effects on LPS-induced DNA binding activity and transcriptional activity of nuclear factor-kappa B (NF-$_KB$). Structural analogs of JSH-21 also inhibited both the LPS-induced NO production and NF-$_KB$). transcriptional activity, where diamine substitution at positions 1 and 2 of JSH-21 seems to play an important role in the anti-inflammatory activity.

Metal Complexes of Ambidentate Ligand (Ⅶ). Palladium (Ⅱ) Complexes of Isonitrosobenzoylacetone Diimine Derivatives (Ambidentate 리간드의 금속착물 (제 7 보). Isonitrosobenzoylacetone 디이민유도체를 리간드로 하는 팔라듐 (Ⅱ) 착물)

  • Choi, Gang-Yeol;Jun, Young-Sook;Baek, Jae-Bum;Lee, Man-Ho
    • Journal of the Korean Chemical Society
    • /
    • v.35 no.6
    • /
    • pp.667-672
    • /
    • 1991
  • Two palladium(Ⅱ) complexes, N-(2-aminoethylisonitrosobenzoylacetone imino) chloropalladium(Ⅱ), PdCl(IBA)-en, and N-(3-aminopropylisonitrosobenzoylacetone imino) chloropalladium(Ⅱ), PdCl (IBA)-tn, have been prepared from the condensation of isonitrosobenzoylacetone (IBA) and diamine (ethylenediamine(en) or trimethylenediamine(tn)) in the presence of palladium(Ⅱ) ion. It is suggested that the Schiff base formed by condensation of an isonitrosobenzoylacetone and a diamine coordinates to the metal through three nitrogens of isonitroso (=N-O), C=N, and $NH_2$groups as a tridentate ligand. And also a chloride ion coordinates to the metal in addition to the Schiff base ligand to form a square-planar geometry.

  • PDF

Examining the performance of PAI/ZnO synthesized with diamine and nano particles

  • Jianwei Shi;Xiaoxu Teng
    • Advances in nano research
    • /
    • v.14 no.2
    • /
    • pp.201-210
    • /
    • 2023
  • A ZnO/poly (amide-imide) hybrid nanocomposite film with different weight percentages of Zinc oxide (ZnO) nanoparticles is synthesized and characterized in this paper. A two-step reaction successfully synthesized a new kind of heteroaromatic diamine with bulky pendant groups. In order to produce 3, 5-dinitro-3, 3-bis (4-(4-Nitrophenoxy) phenyl) -2- benzofuran-1-one, 3, 3'-bis (4-hydroxyphenyl) benzofuran-1-one and 3'-bis (4-hydroxyphenyl) benzofuran-1-one were combined with 3'-bis (3-hydroxyphenyl) benzofuran-1-one. The obtained dinitro was then reduced by zinc dust and hydrochloric acid. The reaction of 4, 4* carbonyl diphthalic anhydride with amino acid L-alanine in acetic acid leads to the production of very high yields of chiral diacid monomer. As a result of the direct polymerization of these monomers, new optically active polymers were formed (amide-imide). In order to synthesize poly (amide-imide)/ZnO nanocomposites with different weight percentages (2, 4, 6, 8, and 10%), PAI and ZnO nanoparticles were combined using ultrasonication SEM, Fourier transform infrared spectroscopy, X-ray diffraction and thermal gravimetry were used to characterize the PAI films.