INDEX resin preparation

The free oil can be determined by an ion exchange HPLC technique. A solution of the sample in ethyl alcohol is analysed by high-performance ion exchange chromatography using a specially prepared ion exchange resin stationary phase, ethanol mobile phase, and differential refractive index detection. 

Fig. 2.—Preparative Separation of Same Sample as Used in Fig. 1, on Laboratory-packed, Preparative Column (2.2 x 30 cm) of HPX-42 (Ag+) Resin, Eluted with H2O at 1.1 mL/min. [Sample size, 125 mg pressure, 700 kPa. Refractive index detection at 128x. Each numbered oligosaccharide was collected at 75-92% purity. Numbers above peaks refer to d.p. values. See also. Ref. 8.]...

Phenolic, (I), and naphtholic, (II), condensation polymers containing cyclopentane were previously prepared by Sue et al. (1). These materials were subsequently epoxidized with epichlorohydrin and used in electronic devices as ICs and Lumen solubility indexes (LSIs). In a subsequent investigation by Abe et al. (2) novolak resins functionalized with thiophene, (III), were prepared and used as adhesives. 

Poly(urethane urea)polysulfide resins consisting of polycaprolactone diol, 4,4 -methylenebis(cyclohexyl isocyanate), and bis-epithiopropyl sulfide, were prepared by Bojkova et al. (4) and used as optical lenses having good refractive index and good impact resistance/strength. 

Chromatographic System Use a liquid chromatograph equipped with a refractive index detector that is maintained at a constant temperature and a 9-mm x 30-cm column packed with a strong cation-exchange resin, about 9 pm in diameter, consisting of sulfonated cross-linked styrene-divinylbenzene copolymer in the calcium form (Aminex HPX-87c, or equivalent). Maintain the column temperature at 85° + 0.5°, and the flow rate of the Mobile Phase at about 0.5 mL/min. Chromatograph the Standard Preparation, and record the peak responses as directed under Procedure. Replicate injections show a relative standard deviation not greater than 2.0%. 

Added importance centers on the dialkyldialkoxysilanes in view of the fact that they are satisfactory intermediates for the manufacture of silicon resins. These compounds may be made by a modification of the Grignard method without the use of ether as a solvent,58 and many of the alkyltriethoxysilanes listed in the compound index at the end of this chapter also were made this way.69 The allyltri-ethoxysilane so prepared apparently did not polymerize, but the phenylethynylsilanes prepared by the following reactions... 

Microscopy. The polarized optical micrographs of thin films of HX-205 and F-185 neat resins were obtained using a Zeiss ultraphot microscope equipped with a polarizer and an analyzer. Thin films, approximately 100 microns thick, were prepared by thln-sectlonlng the resin sheet with a razor blade at room temperature. The domains were observable because of light scattering as a result of refractive Index mismatch between the rubber domain and the epoxy matrix, as well as to stress-induced birefringence produced by the thermal stress Imposed on the domains. 

In addition, diethyleneglycol bisallyl carbonate (ADC) was polymerized using 2.5 parts by wt% diisopropyl peroxycarbonate under similar conditions to that in the above preparation. This gave a resin with a refractive index of 1.500 and an Abbe number of 58.8. 

Exxon LL5202.09 LLDPE, a barefoot 12 melt index, 0.924 density polyethylene was used as the carrier resin for preparation of all concentrate formulations. Exxon LL1001.09 LLDPE, a barefoot 1.0 melt index, 0.918 density film resin was selected as the matrix material for the preparation of all letdown compounds. Additive-lree resins were used throughout this trial to minimize potential interactions with additive packages and to simplify the analysis task. 

Indene n. C9H8. Colorless liquid with a Sp gr of 1.006 (20/4°C), mp of 3.5°C, bp of 182°C, refractive index of 1.5726, and a flp of 78.3°C. Insoluble in water, soluble in most organic solvents, rapidly absorbs oxygen from the air, forms polymers by exposure to air and sunlight. Derivation Contained in the fraction of crude coal tar distillates, which boils from 176 to 182°C. Uses Preparation of synthetic resins. 

Guan C, Lii C-L, liu Y-F, Yang B (2006) Preparation and characterization of high refiactive index thin films of Ti02/epoxy resin nanocomposites. J Appl Polym Sci 102(2) 1631-1636... 

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