• Journal of the Korean Chemical Society
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• v.23 no.5
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• pp.325-328
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• 1979

trans-1,2-Bispyrazylethylene (BPE) undergoes photoaddition reaction to tetramthylethylene (TME) which appears to involve radical intermediates under conditions where the corresponding hydrocarbons are unreactive. This photoaddition reaction involves abstraction of an allylic hydrogen atom of TME by $^1(n,\;{\pi}^*)$ states of BPE having radical character. The major photoadduct is isolated by column chromatography and fractional vacuum sublimation and characterized to be 2,3-dimetyl-5,6-bispyrazyl-2-hexene.

• Elastomers and Composites
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• v.55 no.4
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• pp.263-269
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• 2020

Novel flexible terpolymers with a reactive moiety were synthesized by coordination polymerization with a metallocene catalyst and a cocatalyst system. C2-symmetric rac-Et(Ind)2ZrCl2 and tri-iso-butylaluminum/dimethylanilinium tetrakis (pentafluorophenyl) borate were employed as the catalyst and cocatalyst, respectively. We synthesized reactive terpolymers consisting of ethylene, a high α-olefin content (1-hexene, 1-octene, 1-decene, and 1-dodecene), and divinylbenzene. The structure and composition of the terpolymers were characterized by 1H-nuclear magnetic resonance analysis. The catalytic activity, polymer yield, molecular weight, and molecular weight distribution were measured as functions of the chain length and high content of α-olefins. Furthermore, the thermal properties and crystallinity of the terpolymers were determined by differential scanning calorimetry and wide-angle X-ray scattering.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2004.10a
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• pp.96-99
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• 2004

Silica fillers were coated by plasma polymer coatings of 1,3-diaminopropane, allylamine, pyrrole, 1,2-epoxy-5-hexene, allyl mercaptan and allyl alcohol using RF plasma (13.56 MHz). The coated fillers were then mixed with biphenyl epoxy, phenol novolac (curing agent) and/or triphenylphosphine (catalyst), and subjected to DSC analyses in order to elucidate the chemical reaction between functional moieties in the plasma polymer coatings and the epoxy resin. Only the samples with 1,3-diaminopropane and allylamine plasma polymer coated silica fillers showed heat of reaction peaks when they were mixed with biphenyl epoxy resin only, while these samples as well as the samples with 1,3-diaminopropane, allylamine and pyrrole plasma polymer coated silica fillers exhibited heat of reaction peaks when mixed with both biphenyl epoxy and phenol novolac (curing agent).

• Journal of the Korean Chemical Society
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• v.43 no.1
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• pp.74-84
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• 1999

Most of the reactions involving benzotriazoles as a synthetic auxiliary have been explained by ionic mechanisms, whereas benzotriazole-mediated radical reactions have received little attention. The reaction of 1-[(aryl)(phenylseleno)methyl]benzotriazole with $Bu_3$SnH in the presence of AIBN in benzene at reflux gave 2-aminodiphenyl selenide (16-29%), 2-aminobiphenyl (9-15%), diphenyl diselenide (30-93%), 1-(arylmethyl) benzotriazole (9-39%) and tributyltin-phenyl selenide (10-36%), whereas the compounds were treated with excess molar amount of $Bu_3$SnH in the absence of AIBN to afford N-(arylmethyl)anilines (44-66%) along with diphenyl diselenide (53-100%), benzotriazole (27-35%) and 1-(arylmethyl)benzotriazole (16-33%). Similarly, treatment of 6-aryl-6-(benzotriazol-1-yl)-1-hexenyl phenyl selenides with $Bu_3$SnH in the presence of AIBN gave 6-aryl-6-phenylamino-1-hexene (9-31%) and 1-aryl-1-oxo-5-pentene (15-44%). A mechanism for the formation of the products is proposed.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.19 no.1
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• pp.31-56
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• 1993

The characteristic aroma of Gardenia Absolute Oil made from Gardenia Jasminoides Ellis was investigated by GC and GC-MSD and by sensory evaluation The method of GC Analysis was used Double Column System by Carbowax 20M /SPB-1 of Pola/nonPola columns. And the result data of analysis was checked automatic Relent ion Indexs Match System by GC Workstation. A total of 51 compounds were identified in Gardenia Absolute Oil, including t entatively erstimated 9 compounds. The major components were Linalool, Farnesene of various form, Jasmin Lactone, Gamma undecalactone and Cis-3-hexone derivatives.

• Journal of Environmental Health Sciences
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• v.27 no.2
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• pp.43-50
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• 2001

This paper reviews the results of a series of efforts to develop structure-activity models for slow-reacting chemicals and olefins whose toxicity may be enhanced by the ultraviolet radiation. Photoinduced toxicity of 14 compounds was found to be a different result of competing factors of structure, having carbon-carbon double bonds. To mimic the biological consequences of photooxidative damage in mammalian cells, the photochemical mutagenicith of 14 chemicals was tested in the CAS. Simple olefins were photochemically mutagenic or carcinogenic with irradiation, increasing the alkylating activity from zero level to 0.87(abs/gram) for styrene, 0.25 for 1-butene, 0.11 for 1-hexene, respectively, whereas no photochemical mutagenicity was observed with 1-octene in the absence of the CAS. Oxide compounds, however, showed a decreasing trend of photoalkylating activities in the presence or absence of the CAS. We found that the structure-activity relationship was not applicable to our data.

• Elastomers and Composites
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• v.54 no.4
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• pp.286-293
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• 2019

In this study, flexible poly(ethylene-ter-1-hexene-ter-divinylbenzene) was prepared using four types of metallocene catalysts (rac-Et(Ind)₂ZrCl₂, rac-SiMe₂(Ind)₂ZrCl₂, rac-SiMe₂(2-Me-Ind)₂ZrCl₂, (C₅Me₅)TiCl₂[O-2,6-ⁱPr₂(C₆H₃)]) and two types of borate catalysts (trityl tetrakisborate and dimethylanilinium tetrakisborate). The yield, catalytic activity, molecular weight, structure, composition, and thermal properties of the terpolymers prepared using the various catalysts and cocatalyst systems were evaluated. Epoxidation of the terpolymers was successfully performed and this transformation was studied by ¹H NMR and FTIR.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.6
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• pp.958-964
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• 2002

To select the irradiation-induced marker components from volatile flavor compounds in irradiated chicken, and complement the extraction problems of liquid continuous extraction (LLCE) method, the volatile compounds of irradiated (0,1,3,5 and 10 kGy) chicken were analyzed by Purge and Trap (P&T) and gas chromatography/mass spectrometry (GC/MS) methods. A total of 119 compounds were detected in irradiated chicken, and these compounds were composed mainly of 7 aldehydes,22 ketones,8 alcohols,30 esters,36 hydrocarbons,8 aromatic compounds and 8 miscellaneous compounds. Among these, only 21 compounds were detected in both LLCE and P&T methods, and the 98 other were detected in omly P&T method. Among volatile compounds detected in irradiated chicken, only 3 compounds such as hexene (r=0.96, p<0.01), propanol (r=0.93, p<0.05) and 1,3-bis(1,1-dimethylethyl) benzene (r=0.96, p<0.05) were newly selected as marker compounds in irradiated chicken by P&T method, which showed significant and high positive correlation coefficient in the change of relative concentration according to the increment of irradiation dosage.

• Korean Journal of Food Science and Technology
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• v.31 no.4
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• pp.931-937
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• 1999

Styrene dimers and trimers from polystyrene cup noodle containers were analyzed by GC and GC/MS extracted with various simulants. For the quantitation of styrene dimers and trimers, 1,3-diphenylpropane (DP) and benzyln-butyl phthalate (BBP) were chosen as the standards. The results showed that the average of the styrene dimers in the containers was 603 ppm, and that of trimers was 5731 ppm. Four styrene dimers, including 1,2-diphenyl-cyclobutane, were identified as well as seven trimers such as 2,4,6-triphenyl-l-hexene. The migration of the styrene dimers and trimers, from the cup noodle containers of polystyrene into foods, was conducted using simulants including boiling water as well as soybean oil and n-heptane. In addition to, the analysis of each migrated styrene was also performed filled with boiling water into noodle and soup after certain time (5, 10, 20, 30 min). The results showed that the migration of styrene dimers and trimers from cup noodle containers was not detected in the case of using boiled water or soybean oil as a simulant, while styrene dimers and trimers were detected 1.18 ppm and 14.21 ppm, respectively, when heptane was adopted as a simulant. In the case of filling with boiled water into noodle and soup, both styrenes were not detected at 5 min and 10 min, however, some samples standing for 20 min released styrene dimers and trimers as much as 0.009 ppm, and 0.019 ppm for 30 min.

• Journal of Adhesion and Interface
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• v.2 no.2
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• pp.1-10
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• 2001

Silica for Epoxy Molding Compound (EMC) was coated via plasma-polymerization with RF plasma (13.56 MHz) as a function of treatment time, power and pressure. 1,3-diaminopropane, allylamine, pyrrole, 1,2-epoxy-5-hexene, allylmercaptan or allylalcohol were utilized for plasma polymerization coating and adhesion of coated silica was evaluated by measuring flexural strength. CTE and water absorption of EMC were also measured, and fracture surface of flexural specimen was analyzed by SEM in order to elucidate the failure mode. The plasma polymer coated silica was analyzed by FT-IR and reactivity of plasma polymer coating with epoxy resin was evaluated with DSC in order to investigate the adhesion mechanism. The EMC prepared from the silica coated with 1,3-diaminopropane or allylamine exhibited high flexural strength, low CTE, and low water absorption compared with the control sample, and also exhibited 100% cohesive failure mode. These results can be attributed to the chemical reaction between the functional groups in the plasma polymer coating and epoxy resin, and also consistent with the results from FT-IR and DSC analysis.