Clear melt

Chloromethyl)pyridine hydrochloride [1822-51-1] M 164.0, m 170-175°, 172-173°, pK , -5.6. Purified by recrystn from EtOH or EtOH-dry Et20. It melts between 171° and 175° and the clear melt resolidifies on further heating at 190° and turns red to black at 280° but does not melt again. The picrate-hydrochloride (prepared in EtOH) has m 146-147°. The free base is an oil, [Mosher and Tessieri J Am Chem Soc 73 4925 1951.]... 

The decomposition temperature is somewhat influenced by the rate of heating. The material does not form a clear melt during the decomposition,... 

The product obtained by this procedure is pure enough for most purposes. Its melt, however, is faintly cloudy. A product of high purity, giving a clear melt, can be obtained by recrystallization from about 15 ml. of dry carbon tetrachloride per gram of sulfenyl chloride. When stored in a sealed brown bottle with a plastic cap (no metal ), the sulfenyl chloride is stable for years. 

White trigonal crystals hygroscopic refractive index 1.735 density 2.38 g/cm melts to a clear melt at 264°C decomposes at 600°C highly soluble in water (90g/100g at 28° C solubility greatly increases with temperature (234g/100g at 100°C) also, soluble in methanol, pyridine and ammonia solution. 

After all the ingredients have been introduced into the kettle the temperature rises to 113-115°C. At this temperature the mixture forms a clear melt in 20 min. If the mixture remains turbid, further heating and stirring is necessary. 

Perchlorates Since perchlorates arc not reduced by H2SOg, they will remain (if present) unchanged in the filtrate after removal of chlorides and chlorates. For a quantitative test, transfer that filtrate to a platinum crucible and evaporate to dryness on a steam bath. Add 5g of anhydrous Na2C03, mix and heat over a burner until a clear melt is obtd and then for 15—20 mins more. Cool the meit, dissolve in dilute HN03 and determine the chloride by pptn with AgN03 soln... 

Polyesterification involving insoluble reactants such as isophthalic acid is normally carried out in two-stage reactions, in which isophthalic acid reacts first with the glycol to form a clear melt. The balance of the reactants, including maleic anhydride, is then added to complete the polyester polymer, thus avoiding longer cycle times and some discoloration. 

Looking at the melt fracture of specific polymers, we see many similarities and a few differences. Polystyrene extrudates begin to spiral from smooth at t 105 N/m2, and at higher shear stresses, they are grossly distorted. Visual observations show a wine glass entrance pattern with vortices that are stable at low stress values and spiral into the capillary and subsequently break down, as t is increased. Clearly, melt fracture is an entrance instability phenomenon for this polymer. 

The thermal properties of the swivel cruciforms 40-47 were analyzed by DSC. Remarkably, the cruciforms 45, 43, 44 (R = tat-butyl), 46 and 42 show distinctly increased Tg values of 95, 130, 140, 130 and 225 °C, respectively. Only the fluori-nated derivatives 45 and 46 display clear melting transitions in DSC with Tm = 228 and 257 °C, respectively. 

Polydextrose (Appi, 1991) is a synthetic, randomly bonded, amorphous, condensation heterooligomer of glucose, sorbitol, and citric acid, with M not exceeding 5000 Da and a solution pH of 2.5-3.5. Its solution viscosity is slightly higher than that of sucrose at similar concentrations, and it forms a clear melt above 130°C. 

Figures 12.1 and 12.2 for the fusion arrangement. Pipette 4 mL of strontium carrier and 1 mL of barium carrier onto the sample. Add 1 mL of 2 M Ca(N03)2 solution. Add 25 g of NaOH pellets. Carefully heat over Meeker burner for 30 minutes. Remove from heat and slowly add 2.5 g of Na2C03 to the hot melt, stir with nickel stirring rod, and continue heating the clear melt for 30 minutes to convert calcium, strontium, barium, and radium salts to carbonates.

The clear point, also called the clear melting point, complete melting point, complete fusion point or capillary melting point, is the temperature at which a sample of fat becomes visibly completely clear, indicating the disappearance of all traces of solid fat (Rossell, 1986 Stauffer, 1996). Its measurement is specified by the American Oil Chemists Society (AOCS) Official Method Cc 1-25 (Firestone, 1998). Samples of the tempered fat contained in at least three vertical glass capillary tubes, sealed at their lower ends, are attached to a vertical mercury-in-glass thermometer such that their lower ends are level with the lower end of the thermometer s bulb. This assembly is immersed in a water bath and heated, and the... 

The sample must be completely liquid, optically clear, dry and bright. Thus, the color of butter is actually determined on the extracted milk fat (Keen and Udy, 1980). The AOCS method 13e-92 requires that if a sample is not liquid at room temperature, it must be heated to a temperature 10°C above its clear melting point. The operator must not be color-blind. 

The phthalic anhydride should be tested by heating a sample in a test tube. If the material does not produce a clear melt without formation of gas, it must be dehydrated by heating it carefully in a porcelain dish until a perfectly clear, nonfoaming melt is formed. The melt is then cooled in a desiccator. 

Fig. 4. Iseli melting point apparatus, with metal block and uree-point illumination. Only the side lights are used until sintering begins, and then the rear light is turned on to permit close observation of the formation of a clear melt. The apparatus is also built with an electrical heating element.

The white crystalline solid has no clear melting point. Decomposition begins at approximately 170°, but sublimation may be accomplished at 190° under reduced pressure with some loss of material. It is soluble in ethers and slightly so in aromatic hydrocarbons. The substance rapidly decomposes with the slightest exposure to either HeO or Oe- Diindenylmagnesium crystallizes in the orthorhombic space group P2i2i2i with lattice Constantsa = 21.494(9), b = 12.375(5), c = 10.394(4) A, and pcaicd = 1.23 cm 3 for 8 molecules per unit cell. 

After heat treatment, the appearance and flowing condition of the PCS powder were examined. A sample with Aw/w = 2.9% clearly melted and congealed, but samples with Aw/w > 3.2% remained in powdered form, with no trace of fusion. Even oxidized PCS with Aw/w < 6.5% (Table I), which melted or partially melted at <300 °C, did not melt when heated slowly at the rate of 20 °C/h. 

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