Biphenyl, polyethylene

Phthalic anhydride 1,2-Polybutadiene Polychlorinated biphenyls Polyethylene glycol Polyglyceryl-2 stearate Polyurethane, thermoplastic PPG-20 PPG-3 methyl ether PPG-40-PEG-60 lanolin oil Propylene carbonate... 

CDP A process for destroying dioxins and polychlorinated biphenyls by treatment with a polyethylene glycol and sodium peroxide in a fixed catalyst bed. Developed by Sea Marconi Technologies, Turin, Italy. See also KPEG. 

In tests of materials saturated with liq oxygen and subjected to 71-75 lb drop weight tests, the following were found acceptable (one de-tonation/40 impacts or none/20) fluorocarbon oils greases, graphite, halogenated biphenyl molybdenum disulfide lubricants, polyethylene... 

The biphenyl iron complex, 2,6-diacetylpyridinebis(4-chloro-2,6-dimethyl-phenylimine)iron dichloride, (III), was prepared by Kristen et al. (1) and used to prepare polyethylene. 

Figure 3. Molecular weight distribution of polyethylene in biphenyl...

KPEG [K (potassium) PolyEthylene Glycol] A process for destroying polychlorinated biphenyls in contaminated soil by heating to 150°C, under pressure, with potassium hydroxide, a polyethylene glycol, and a sulfoxide. Based on an invention made at the Franklin Institute, Philadelphia, in which metallic sodium was used. Later developed by Galson Research Corporation, New York, and first demonstrated in 1988. See also CDP. 

Lee et al. also reported the assembling behavior of coil—rod—coil ABC triblock molecules where the rod block is connected as the middle block, consisting of polyethylene oxide) with different degrees of polymerization, two biphenyl unit as rod and docosyl coil (Chart 4).67 All of the coil—rod—coil ABC triblock molecules (12) exhibit three different crystalline melting transitions associated with polyethylene oxide), docosyl, and rod blocks, respectively, as determined by DSC, indicative of phase separation among blocks. 

Dimethyl terephthalate for the production of polyethylene terephthalate) is produced by the cobalt salt-catalyzed oxidation of p-xylene with oxygen (reaction 1.15).209 In this free radical process, some biphenyl derivatives are formed. In addition, triesters are formed from any trimethylbenzenes in the feed. Thus, the still bottoms contain several compounds, which are all methyl esters. Hercules found that transesterification of this mixture with ethylene glycol led to a mixture of polyols that could be used with isocyanates to form rigid polyurethanes. For the price, the Terate product was hard to beat. 

When biphenyl was added to polyethylene [174], the biphenyl anion and cation absorption spectra were obtained after irradiation, together with an apparently unchanged trapped-electron absorption. QJ and Qj were both removed by photobleaching. On warming, Qj starts to decay at —120°C, the temperature which corresponds to the first transition in polyethylene. This suggests that the decay is due to diffusion and reaction of the Q2 ion rather than to thermal ejection of the attached electron. 

In another experiment, the irradiated sample was photobleached with IR radiation and then maintained at room temperature in the absence of oxygen until 90% of the radicals had decayed. If the sample was then re-irradiated, the maximum concentration of 4.2 x 1016 electron g 1 was restored after absorption of 3.0x1019 eVg-1. The decrease of the trapped electron concentration was thus assigned by Keyser et al. to a reaction of free radicals with trapped electrons. If the G value for alkyl radicals obtained by Waterman and Dole [214] for linear polyethylene at 77°K is used (G = 3.3), it can be calculated that the concentration of free radicals is 1.5 x 10-3 mole l-1 if the absorbed dose is 3 x 101 9 eV g-1. Scavenging of electrons in hydrocarbon glasses by biphenyl shows that, in this case, 1.5 x 10-3 mole l-1 biphenyl scavenges 50% of the ejected electrons [215]. 

Analytes CB, chlorobenzenes DDE, l,l-dichloro-2,3-bis(4-chlorophenyl)ethane DDT, l,l-dichloro-2,3-bis(4-chlorophenyl)ethylene DBF, decabromobiphenyls HBCD, Hexabromo-cyclododecane HpBB, heptabromobiphenyl PBB, polybrominated biphenyl PBCCH, pentabromochlorocyclohexane PBDE, polybrominated diphenyl ether PBT, Polybutylene terephthalate PCB, Polychlorinated biphenyl PBDD, polybrominated dibenzo-/ -dioxins PBDF, polybrominated dibenzofuranes PCN, polychlorinated naphthalenes PCP, polychlorinated phenols PBB, polybrominated biphenyl PeBDE, pentabromodiphenyl ether PET, Polyethylene terephthalate PXDDs, polyhalogenated dibenzo-p-dioxins PXDFs, polyhalogenated dibenzofurans TBBPA, tetrabromobisphenol A TBPA, tetrabromophthalic anhydride TCBPA, tetrachlorobisphenol A TDBPP, tris(2,3-dibromopropyl)phosphate. 

Yet another interesting conclusion may be derived from the two-liquid adhesion tension data of Bascom and Singleterry [11] which are recorded in Table III. If Equation 17 is applied to each of two different hydrocarbon liquids, the difference between the two solid-liquid interfacial tensions is just the (negative) difference between the respective two-liquid adhesion tensions. Thus, from the values given in Table III, the solid-liquid tension for isopropyl biphenyl is 8 dynes per cm. greater than that for n-decane. This difference is the same for both oolytetra-fluoroethylene and polyethylene. 

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