• Title, Summary, Keyword: phosphine

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Adhesive Property of Novel Polyimides Containing Fluorine and Phosphine Oxide (Phosphine oxide와 불소를 함유하는 폴리이미드의 접착성 연구)

  • Jeong, K.U.;Myung, B.Y.;Cho, Y.J.;Choi, I.J.;Yoon, T.H.
    • Journal of Adhesion and Interface
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    • v.1 no.1
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    • pp.38-46
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    • 2000
  • A novel diamine monomer, containing fluorine and phosphine oxide, bis(3-aminophenyl) 3,5-bis(trifluoromethyl) phenyl phosphine oxide (mDA6FPPO), was prepared via Grignard reaction, and utilized to prepare polyimides with dianhydrides such as PMDA, 6FDA, BTDA or ODPA, by the conventional two-step route; preparation of poly(amic acid), followed by solution imidization. The polyimides were characterized by FT-lR, NMR, DSC and DMA, with intrinsic viscosity, and adhesive properties were also evaluated. A phosphine oxide containing monomer, bis(3-aminophenyl) phenyl phosphine oxide (mDAPPO) a nd a commercial 3,3'-diamino diphenyl sulfone (mDDS) were also used for comparison. The polyimides with mDA6FPPO exhibited high $T_g$, excellent solubility, and good adhesive properties.

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Aroma Analysis by the Electronic Nose on Red Ginseng Powder Treated with Gamma Radiation, Methyl Bromide and Phosphine (전자코를 이용한 감마선, methyl bromide 및 phosphine 처리된 홍삼분말의 저장 중 향기패턴 변화 연구)

  • Shin, Jung-Ah;Kwon, Joong-Ho;Lee, Ki-Teak
    • Korean Journal of Food Science and Technology
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    • v.35 no.5
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    • pp.825-829
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    • 2003
  • An electronic nose was applied to analyze the aroma patterns of powdered red ginseng that had been treated with different preservative methods, such as gamma radiation at 5kGy, commercial methyl bromide (MeBr) and phosphine fumigations. Aroma patterns of phosphine or MeBr, fumigated samples were well separated according to storage temperature and period. However, 5kGy-irradiated samples (stored for 1 and 2 months) were hardly discriminated by the different storage temperatures ($25^{\circ}C$ and $-10^{\circ}C$). After 5 months at $-10^{\circ}C$, non-treated and phosphine fumigated samples showed similar aroma patterns.

Evaluation of Phosphine Efficacy on Anoplophora chinensis and A. glabripennis in Export Bonsai (수출분재 주요 해충인 알락하늘소와 유리알락하늘소에 대한 포스핀 훈증 효과 검정)

  • Lee, Sang Myeong;Jung, Young Hack;Lee, Byung-Ho;Kim, Bong-Su;Park, Min-Goo;Lee, Dong Woon
    • Korean journal of applied entomology
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    • v.57 no.3
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    • pp.151-160
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    • 2018
  • Anoplophora chinensis and A. glabripennis is classified as important quarantine Cerambycidae beetles worldwide. These beetles cause serious damage on natural host plants and export bonsai trees in Korea. We evaluated efficacy of phosphine fumigant for control of two Cerambycidae beetles in bonsai. In the preliminary test to achieve CT (Concentration x time) values of phosphine to Cerambyicdae beetles larvae, we used Monochamus alternatus of larvae as an alternative insect. A 24 h phosphine fumigation with $2g/m^3$ phophine achieved 100% eggs mortality against Anoplophora chinensis and A. glabripennis. Larva of A. chinensis was also completely controlled when treated for 168-h at same dose desiccator. 100% mortality on larval stage of two beetle species were achieved both in dormancy (January) and vegetative period (February) of bonsai when treated with $2g/m^3$ phosphine. However, phosphine fumigation against vegetative period of Acer palmatum, Carpinus turczaninowii and Malus sieboldii bonsai showed slight phytotoxicity (shorten leaf and flower size and delayed flowering).

Synthesis and Characterization of Novel Aromatic Polyimides from Bis (3-aminophenyl) 3,5-bis (trifluorormethyl) phenyl Phosphine Oxide

  • Jeong, Kwang-Un;Kim, Jang-Joo;Yoon, Tae-Ho
    • Macromolecular research
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    • v.8 no.5
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    • pp.215-223
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    • 2000
  • A novel diamine monomer, containing fluorine and phosphine oxide, bis(3-aminophenyl) 3,5-bis(trifluoromethyl)phenyl phosphine oxide (mDA6FPPO), was prepared via Grignard reaction, and utilized to prepare polyimides with dianhydrides such as PMDA, 6FDA, BTDA or ODPA, by the conventional two-step route; preparation of poly(amic acid), followed by solution imidization. The polyimides were characterized by FT-IR, NMR, and DSC with intrinsic viscosity and refractive index also being evaluated. A phosphine oxide containing monomer, bis(3-aminophenyl)phenyl phosphine oxide (mDAPPO) and a commercial 3,3-diaminodiphenyl sulfone (mDDS) were also used for comparison. The polyimides derived from mDA6FPPO exhibited high T$\sub$g/, excellent solubility and low birefringence.

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Synthesis of Palladium Nanoparticles Encapsulated in Phosphine Ligand-Grafted Mesoporous Silicas and Their Application to Suzuki Cross-Coupling Reaction (팔라듐 나노입자가 담지된 메조포러스 실리카의 제조와 이를 이용한 Suzuki Cross-Coupling 반응의 적용연구)

  • Kim, Sang-Wook;Joo, Jin
    • Clean Technology
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    • v.17 no.1
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    • pp.13-18
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    • 2011
  • Phosphine ligand-grafted mesoporous silica materials with large pores were prepared for the ligand-modified heterogeneous Pd nanocatalysts. New heterogeneous catalytic system was developed using palladium nanoparticles encapsulated in phosphine ligand-grafted mesoporous silica. The catalyst showed good catalytic activities for Suzuki cross-coupling using bromobenzene derivatives due to excellent phosphine ligand effects. Catalytic results showed nanoparticie catalysts can be recycled twice with decreased yields.

Studies on alkali hydrolysis and hydrogen reduction of O,O-dimethyl-S-(Phthalimido) methylphosphorodithioate (O,O-dimethyl-S-(phthalimido) Methylphosphoro-dithioate의 알칼리 가수분해와 수소환원에 관한 연구)

  • 이명연
    • YAKHAK HOEJI
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    • v.16 no.1
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    • pp.47-54
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    • 1972
  • O,O-Dimethyl-S-(phthalimido)methylphosphorodithioate (PMP) is changed into phosphine, phosphate, and phosphorothioate, when it is treated with metallic zinc in acidic medium after alkaline hydrolysis. The amount of phosphine evolved is about five times as much in sulfuric acid medium as it is in hydrochloric acid. When one micro mole of hydrolyzed PMP is treated with 8 grams of metallic zinc and 30 ml of 10 N-sulfuric acid, it is changed into 0.42 micro moles of phosphine, 0.14 micro moles of phosphorothioate, and 0.44 micro moles of phosphate.

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Comparative Effect of Gamma Irradiation and Phosphine Fumiagion on Color and Organoleptic Quality of White Ginseng (감마선과 Phosphine 처리가 백삼의 색도 및 관능적 품질에 미치는 영향)

  • 권중호;정형욱;변명우;양재승;이수정;김현구
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.28 no.1
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    • pp.47-52
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    • 1999
  • Comparative effects of phosphine fumigation and gamma irradiation were evaluated on the qualities of white ginseng prepacked in a commercial laminated film in terms of water absorption, Hunter color parameters(L, a, b) and organoleptic properties(overall color/appearance, flavor) during 6 months of storage at ambient(20oC, 70% RH) and accelerated(40oC, 90% RH) conditions. Moisture content of packed white ginseng(initial 8.44%) linearly increased with storage period, thereby reaching to about 10% (r=0.9966) in ambient and more than 15%(r=0.9886) in accelerated conditions, respectively, at the 6th month of storage. The storage at severe conditions resulted in remarkable changes in Hunter's color values, decrease in whiteness(L) and increase in redness(a) and yellowness(b), while both treatments, phosphine and irradiation less than 5kGy, did not cause any significant changes in color parameters. Phosphine fumigation was shown detrimental to overall flavor of white ginseng(p<0.01), however or ganoleptic qualities of stored samples were effectively maintained by irradiation less than 5kGy(p< 0.05). As the index on the guality of white ginseng stored at severe conditions its organoleptic quality was highly correlated with moisture content(r= 0.9777) and Hunter color values(over 0.9), suggesting the critical values of 15.5% moisture and 72.56, 7.15, 21.45 in Hunter's L, a, b values, respectively.

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