Polymers amine derivatives

Proteins are also important nitrogen compounds. They constitute much of the cell materials, and are present in every type of organism known. In humans, muscle tissue, skin, and hair is mostly protein, about half of the dry weight of our bodies. From a chemical point of view, proteins are polymers of amino acids, alpha amine derivatives of carboxylic acids. Only about 20 different amino acids are actually found in proteins. It is the large number of variations in the protein chain, using only these... 

PEG-Amine Derivative (Jeffamine Series from Texaco Various Polymer Lengths Available)... 

Figure 25.14 An amine derivative of dextran may be prepared through a two-step process involving the reac-tion of chloroacetic acid with the hydroxyl groups of the polymer to create carboxylates. Next, ethylene diamine is coupled in excess using a carbodiimide-mediated reaction to give the primary amine functional groups.

Figure 25.18 An amine-derivative of dextran may be coupled with iodoacetic acid using a carbodiimide reaction to produce a sulfhydryl-reactive iodoacetamide polymer.

Aiming at easier workup conditions, immobilization of several transition metal catalysts, which show activity for the epoxidation of allylic alcohols, on polymer support has been investigated. For example, Suzuki and coworkers incorporated an oxo-vanadium ion into cross-linked polystyrene resins functionalized with iminodiacetic acid or diethylenetri-amine derivatives (Scheme 57), which afforded a heterogeneous catalyst that can promote... 

When commercially available polybutadienes were used, it was generally necessary to remove the antioxidants and other stabilizers which are usually incorporated to improve storage stability. This was accomplished by conventional methods—e.g., by dissolving the polymer in benzene or chlorobenzene and precipitating in methanol or washing the polymer solution with aqueous alkali if the stabilizer was a phenolic compound, or with aqueous acid if the stabilizer was an amine derivative. If the stablilizer was removed by aqueous washing, it was necessary to remove residual water from the polymer solution by drying over suitable desiccants such as lithium aluminum hydride, calcium hydride, etc. 

These results also confirm that, when the amine function is linked to the polymer, the grafting efficiency is greatly enhanced, the amine-derived radical being a much better initiating species than the semipinacol radical. 

Taking into account that for poIy(VBP-co-DMAS) a pronounced tendency to exciplex formation is observed by phosphorescence measurements [54-57], the above results can be interpreted [20,22] by assuming the occurrence of cage selfcombination of the amine-derived radicals (formed by hydrogen transfer within the radical ion pairs) due to their high local concentration along the polymer... 

Polymeric precursors have been developed which are stable at room temperature and when polymerized convert to ceramics in high yield. Such precursors may be synthesized by reaction of a vinylsilane, vinylmethylsilane, acetylene silane, or acetylene alkyl silane with a borane or a borane amine derivative The reactants are mixed in an inert atmosphere, either neat or in an aprotic solvent like acetonitrile, tetrahydrofuran, or a hydrocarbon, or in a mixture of such solvents. The reaction mixture is heated for 0.1 to 120 h at 90-170°C. The solvent, if any, is then removed. The polymer is pyrolyzed in argon or N2 at SOO-ISOO C for 1 h. BN and other ceramics such as B4C, or SipB QNs compounds can be made, where p, q, r, and s have various numerical values. To date, no measurements of the crystallographic form of the resultant BN compound have been made. Other precursors convertible to BN include poly (2-vinylpentaborane) oligomers. ... 

Both MDI and TDI, being aromatic diisocyanates, yield urethane polymers that tend to yellow on prolonged exposure to sunlight, presumably due to oxidation of some terminal aromatic amine (derived from these isocyanates). MDI also possesses a methylene group that is susceptible to oxidation via a proton abstraction mechanism involving autoxidation of the aromatic urethane groups to a quinoneimide structure as proposed by Schollenberger et al. (24. 25). 

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