• Title/Summary/Keyword: 1,3-Butadiene

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A study on biomarker for biomonitoring of 1,3-butadiene inhalation exposure (1,3-부타디엔 호흡기 노출의 생체지표 대사물질에 대한 연구)

  • Lee, Jin-Heon
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.20 no.1
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    • pp.70-78
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    • 2010
  • The purpose of this study is to investigate the appropriate metabolite as biomarker for the biomonitoring of 1,3-butadiene(BD) inhalation exposure. We measured the hemoglobin adducts which were extracted from the blood of the ICR mice inhalation exposure with 100ppm and 500ppm 1,3-butadiene for 2 weeks(5 hr/day ${\times}$ 5 days/week). Hemoglobin adducts were the (N-2-hydroxy-3 -butenyl) valine (HB Val) and (N-2,3,4-trihydroxy-butyl)valine (THB Val). Body weights of the exposure groups were significantly lower from 11 exposure post-day in 100ppm BD inhalation mice and from 7 exposure post-day in 500ppm BD inhalation mice than in control. The levels of HB Val are 0.8~1.7pmol/mg globin for 100ppm BD inhalation exposure, and 2.1~4.4 pmol/mg globin for 500ppm BD inhalation exposure. The levels of THB Val are 15.0~22.0 pmol/mg globin in 100ppm BD inhalation exposure, and 34.8~45.7 pmol/mg globin for 500ppm BD inhalation exposure. So the levels of THB Val and HB Val are proportional relationship with BD exposure level. THB Val is 12.9~18.8 times higher level that HB Val in 100ppm BD exposure group and 10.4~16.6 times higher level than HB Val in 500ppm BD exposure group. We concluded that THB Val is an appropriate metabolite as biomarker for the biomonitoring for BD inhalation exposure.

Study on the reduction of stick-slip noise in acrylonitrile butadiene styrene-based plastics using non-polar additives to reduce friction (마찰 저감을 위한 비극성 첨가제에 따른 acrylonitrile butadiene styrene계 플라스틱의 stick-slip 이음 저감 연구)

  • Sangjun Yeo;Yewon Jeong;Sunguk Choi;Hyojun Kim;Geonwook Park;Minyoung Shon
    • The Journal of the Acoustical Society of Korea
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    • v.43 no.1
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    • pp.49-59
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    • 2024
  • Recently, the electric vehicle market is gradually growing due to strengthened environmental regulations and high oil prices. also, in internal combustion engine vehicles, the sensitivity of Buzz, Squeak, Rattle (BSR) noise is increasing as engine Noise, Vibration, and Harshness (NVH)-related noise is reduced and technology for shielding noise coming from outside is developed. In this study, the stick-slip noise that occurs in Panoramic Curved Display (PCD) of automobile was analyzed for the correlation between the surface energy of polymer plastic and the polar component. For polar polymer materials, Acrylonitrile Butadiene Styrene (ABS) and PolyCarbonate-Acrylonitrile Butadiene Styrene (PC-ABS), compound materials were fabricated and evaluated. As a result, when the polar component of the polymer plastic was 3.86 mN/m or higher, stick-slip motion occurred, and as the absolute transition slope increased in the friction behavior over time, the possibility of stick-slip noise increased and the value of the friction coefficient The greater the difference, the greater the strength of the stick-slip noise.

A Study on Curing Reaction of 1-Chlorobutadiene-Butadiene Copolymer by Moisture (1-Chlorobutadiene-Butadiene Copolymer의 수가교반응(水架橋反應)에 관한 연구(硏究)(II))

  • Yoo, Chong-Sun;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.22 no.4
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    • pp.305-313
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    • 1987
  • In this study, as one of the developing ways of the functional elastomer, improvement of the functionality of 1-Chlorobutadiene-Butadiene Copolymer(CB-BR) was attempt through curing reaction by moisture. The curing reaction of CB-BR was determined an use of $\gamma$-Aminopropyltriethoxysilane(APS) and $\gamma$-Aminopropylmethyldiethoxysilane(ADS) as a crosslinking agent with filler at so the uncrosslinked elastomer was exposured in the air and curing reaction by moisture in the air was studied. The results obtained are as follows. 1. APS was more efficient than ADS as a crosslinking agent for CB-BR 2. Optimum amount of APS for moisture cured elastomer was r=1.5(at the ratio of $[APS]/[Cl^*]$) also in case(r=1.5), elastomer formed after soaking $T_{72}$ had similar physical properties with elastomer crosslinked by sulfur and it was very good. 3. Uncrosslinked elastomer(CB-BR+APS+Silica) was easily crosslinked by exposure to the air, and the physical properties was also satisfactory.

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Synthesis of 1,1-Dimethyl-2,5-bis(trimethylsilyl)-3,4-diphenyl-1-silacyclopenta-2,4-diene (1,1-Dimethyl-2,5-bis(trimethylsilyl)-3,4-diphenyl-1-silacyclopenta-2,4-diene의 합성)

  • Young Kun Kong;Wan-Chul Joo
    • Journal of the Korean Chemical Society
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    • v.30 no.6
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    • pp.521-525
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    • 1986
  • From the reaction of phenyltrimethylsilylacetylene with lithium, 1,4-bis(trimethylsilyl)-2,3-diphenyl-1,4-butadene dianion was formed. The reaction of dianion with dichlorodimethylsilane affords 1,1-dimethyl-2,5-bis(trimethylsilyl)-3,4-diphenyl-1-silacyclopenta-2,4-diene. In addition 1,4-bis(trimethylsilyl)-2,3-diphenyl-1,3-butadiene was isolated. It seems to be hydrolized product in alkali medium.

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Evaluation of 1,1,2-trichloroethylene Removal Efficiency Using Composites of Nano-ZnO Photocatalyst and Various Organic Supports (다양한 유기계 지지체와 광촉매 Nano-ZnO 복합체를 활용한 1,1,2-trichloroethylene 제거 효율 평가)

  • Jang, Dae Gyu;Ahn, Hosang;Kim, Jeong Yeon;Ahn, Chang Hyuk;Lee, Saeromi;Kim, Jong Kyu;Joo, Jin Chul
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.11
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    • pp.771-780
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    • 2014
  • In this study, the various organic supports (i.e., silicone, acrylonitrile-butadiene-styrene, epoxy, and, butadiene rubber) with great sorption capacity of organic contaminants were chosen to develop nano-ZnO/organic composites (NZOCs) and to prevent the detachment of nano-ZnO particles. The water resistance of the developed NZOCs were evaluated, and the feasibility of the developed NZOCs were investigated by evaluating the removal efficiency of 1,1,2-trichloroethylene (TCE) in the aqueous phase. Based on the results from water-resistance experiments, long-term water treatment usage of all NZOCs was found to be feasible. According to the FE-SEM, EDX, and imaging analysis, nano-ZnO/butadiene rubber composite (NZBC) with various sizes and types of porosity and crack was measured to be coated with relatively homogeneously-distributed nano-ZnO particles whereas nano-ZnO/silicone composite (NZSC), nano-ZnO/ABS composite (NZAC), and nano-ZnO/epoxy composite (NZEC) with poorly-developed porosity and crack were measured to be coated with relatively heterogeneously-distributed nano-ZnO particles. The sorption capacity of NZBC was close to 60% relative to the initial concentration, and this result was mainly attributed to the amorphous structure of NZBC, hence the hydrophobic partitioning of TCE to the amorphous structure of NZBC intensively occurred. The removal efficiency of TCE in aqueous phase using NZBC was close to 99% relative to the initial concentration, and the removal efficiency of TCE was improved as the amount of NZBC increased. These results stemmed from the synergistic mechanisms with great sorption capability of butadiene rubber and superior photocatalytic activities of nano-ZnO. Finally, the removal efficiency of TCE in aqueous phase using NZBC was well represented by linear model ($R^2{\geq}0.936$), and the $K_{app}$ values of NZBC were from 2.64 to 3.85 times greater than those of $K_{photolysis}$, indicating that butadiene rubber was found to be the suitable organic supporting materials with enhanced sorption capacity and without inhibition of photocatalytic activities of nano-ZnO.

Synthesis of 1,4-Bis(1'-alkyl-2',3',4',5'-tetraphenyl-1'-silacyclopentadienyl)benzenes (1,4-Bis(silyl)benzene의 고리화반응에 의한 1,4-Bis(1'-alkyl-2',3',4',5'-tetraphenyl-1'-silacyclopentadienyl)benzenes 리간드의 합성)

  • Kong, Young Kun;Ahn, Young Man
    • Journal of the Korean Chemical Society
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    • v.41 no.2
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    • pp.82-87
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    • 1997
  • The 1,4-bis(alkyldichlorosilyl)benzene was synthesized to be a precursor of the bis(silacyclopentadienyl) aromatic system. The cyclization reaction of the precursor with 1,4-dilithio-1,2,3,4-tetraphenyl-1,3-butadiene produced the 1,4-bis(1'-alkyl-2',3',4',5'-tetraphenyl-1'-silacyclopentadienyl)benzene as the ligand of organotransition metal compound and the precursor of the stable silacyclopentadienyl anion.

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