Impregnating resin

Additive Polyimides. Rhc ne-Poulenc s Kin el molding compound and Kerimid impregnating resin (115), Mitsubishi s BT Resins (116), and Toshiba s Imidaloy Resin (117) are based on bismaleimide (4) technology. Maleic anhydride reacts with a diamine to produce a diimide oligomer (7). Eurther reaction with additional diamine (Michael addition) yields polyaminohismaleimide prepolymer with terminal maleic anhydride double bonds. Cure is achieved by free-radical polymerization through the terminal double bonds. 

Figure 9.3(a) A stator core during vacuum pressure impregnation (resin-poor insulation) (Courtesy NGEF Ltd)... 

McCaskey, H.O. Jr., United States patent USP 4,123,579. Resin coated substrate using a short-set, high-flow melamine-formaldehyde impregnating resin. Assigned to Westing-house Electric Corp., 1978. 

Extraction with solvent impregnated resins. A. Warshawsky, Ion Exch. Solvent Extr., 1981, 8, 229-310(102). 

Angiotensin II. Male Sprague-Dawley rats (300-400 g) were administered either free angiotensin II (A-H) (Sigma product A9525, human synthetic A-H, Asp-Arg-Val-Tyr-Ile-His-Pro-Phe) in 0.9% NaCl solution by subcutaneous injection, or A-H impregnated resin by gastric intubation. The resin was suspended in distilled water such that the rat received no more than a 0.5 mL total suspension volume. The... 

The results obtained from A-II injected animals (Figure 15) confirmed that the peak arterial pressure response is a reliable indirect indicator of A-II absorption (27,25). On this basis it is very unlikely that oral administration of A- II-impregnated resin (Figure 16) resulted in any significant absorption, even at an A-II dose which was 25X higher than the maximally effective subcutaneous dose. As in the insulin studies, the detectable response was observed about two and one-half hours after dosing. 

An alternative strategy for catalyst immobilisation uses ion-pair interactions between ionic catalyst complexes and polymeric ion exchange resins. Since all the rhodium complexes in the catalytic methanol carbonylation cycle are anionic, this is an attractive candidate for ionic attachment. In 1981, Drago et al. described the effective immobilisation of the rhodium catalyst on polymeric supports based on methylated polyvinylpyridines [48]. The activity was reported to be equal to the homogeneous system at 120 °C with minimal leaching of the supported catalyst. The ionically bound complex [Rh(CO)2l2] was identified by infrared spectroscopic analysis of the impregnated resin. 

The use of impregnated resins in the preconcentration and separation of trace metal ions provides the following advantages ... 

The cationic polymerization of vinyl isobutyl ether at —40°C produces stereoregular polymers (structure 5.21). The carbocations of vinyl alkyl ethers are stabilized by the delocalization of p valence electrons in the oxygen atom, and thus these monomers are readily polymerized by cationic initiators. Poly(vinyl isobutyl ether) has a low Tg because of the steric hindrance offered by the isobutyl group. It is used as an adhesive and an impregnating resin. 

After the preform had been felted from a water slurry, it was compacted at atmospheric pressure, removed from the die dried at 140°F in a steam-heated, circulating air oven. The dried preform was then soaked in the impregnating resin soln, drained, and finally flash-dried in a vacuum oven to a point where it could be post formed... 

When NGu was used asone of the components of consumable cartridges, it was recrystallized from a satd aqueous soln into the pores of Kraft fiber prior to resin impregnation. When dicyanamidazide was employed, it was added as a component of the impregnating resin-solvent(Ref 23,pp I1I-V, 23, 25 27)... 

The development of solvent-impregnated resins and extraction-chromatographic procedures has enabled the automation of radiochemical separations for analytical radionuclide determinations. These separations provide preconcentration from simple matrices like groundwater and separation from complex matrixes such as dissolved sediments, dissolved spent fuel, or nuclear-waste materials. Most of the published work has been carried out using fluidic systems to couple column-based separations to on-line detection, but robotic methods also appear to be very promising. Many approaches to fluidic automation have been used, from individual FI and SI systems to commercial FI sample-introduction systems for atomic spectroscopies. 

Nii, S. Masutani, M. Takeuchi, H. Extraction of heavy metal ions using encapsulated extractant-impregnated resins. In Solvent Extraction for the 21st Century (Proceedings of ISEC 99), Vol. 2, eds. M. Cox, M. Hidalgo, and M. Valiente, Society of Chemical Industry, London, 2001, pp. 1279-1283. 

Reagent impregnated resins can be used as trapping sorbents for the preconcentration of heavy metals.1 These materials can be used in the same way as activated carbons. 

Reagent Impregnated Resins as Trapping Sorbents for Trace Minerals... 

REAGENT-IMPREGNATED RESINS AS TRAPPING SORBENTS FOR TRACE MINERALS... 

The impregnating resin will display a total lack of natural structure (though air bubbles might be present). However, this would oiJy be visible if a relatively large void is filled with resin. 

EXTRACTION WITH SOLVENT-IMPREGNATED RESINS Abraham Warshawsky... 

Ana Maria Sastre is a professor of chemical engineering at the Universitat Politecnica de Catalunya (Barcelona, Spain), where she has been teaching chemistry for more than 28 years. She received her PhD from the Autonomous University of Barcelona in 1982 and has been working for many years in the field of solvent extraction, solvent impregnated resins, and membrane technology. 

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