Polyamines aliphatic

The condensation leaves epoxy end groups that are then reacted in a separate step with nucleophilic compounds (alcohols, acids, or amines). Eor use as an adhesive, the epoxy resin and the curing resin (usually an aliphatic polyamine) are packaged separately and mixed together immediately before... 

Table 5. Typical Specifications of Some Aliphatic Polyamines...

Aliphatic polyamine disulfides—imino-, carbamide-, thiocarbamide-, ethylenediamine------are low-effi-... 

Polythiosemicarbazide disulfide is the most efficient aliphatic polyamine disulfide for inhibiting the thermal oxidative breakdown of polypropylene, while polyimi-noaniline disulfide and polydiiminodiphenyloxide disulfide (Fig. 3) are the most efficient aromatic polyamine disulfides. In contrast to polyethylene, the thermal oxidative breakdown period increases as the concentration increases (Fig. 4), Depending on the concentration, the flow-melt index at 230°C increases at a lower rate than in the case of commercial stabilizer Santanox (Table 2)-... 

Aliphatic polyamines, amine adducts and polyamides react with epoxide resins at normal temperatures to give complexes with outstanding chemical resistance. Paints based on this type of reaction must be supplied in two separate containers, one containing the epoxide resin and the other the curing agent , the two being mixed in prescribed proportions immediately before use. 

The aliphatic polyamines, putrescine, spermine, and spermidine, are present in green coffee beans, but they are all decomposed during the roasting process.17... 

Liquid aerosols, 7 272t occurrences of, 7 273t Liquid aliphatic polyamines, 10 393 Liquid alkaline finish removers, 18 84-85... 

Commercially available hyperbranched polymers are Polyglycerol (aliphatic polyether polyol) and Polyethylenimine (aliphatic polyamine) both from Hyperpolymers, Boltom (aliphatic polyesters) from Perstorp and Hybrane (aromatic polyester amide) from DSM. 

Kobayashi, M., Suruga, S., Takeuchi, H., Sugawara, M., Iseki, K., and Miyazaki, K. A structure-relationship study of the uptake of aliphatic polyamine compounds by rat intestinal brush-border membrane vesicles, / Pharm. Pharmacol., 49(5) 511-515, 1997. 

The influence of quaternary aliphatic polyamine (QAA) on zinc electrodeposition from an alkaline non-cyanide bath was investigated [230]. In the presence of QAA, the exchange current density decreased and zinc deposit had a smaller grain size. 

Primary and secondary aliphatic polyamines These are low viscosity and low cost materials. In general, linear and branched primary and secondary aliphatic... 

Ambient-cure systems are often based on lower molecular-weight solid epoxy resins cured with aliphatic polyamines or polyamides. Curing normally occurs at ambient temperatures with a working life (pot life) of 8—24 h, depending on the formulation. Epoxy—polyamine systems are typically used for maintenance coatings in oil refineries, petrochemical plants, and in many marine applications. Such coverings are applied by spray or brush. These are used widely where water immersion is encountered, particularly in marine applications (see COATINGS, MARINE). 

Only a handful of reports on iron(II) and iron(III) complexes of opertrchain aliphatic polyamine ligands had previously existed in... 

Diethylaminopropylamine. Diethylaminopropylamine (DEAPA) is an aliphatic polyamine that is used for curing epoxy adhesives where extended pot lives and low heat exotherms are required. This is a reactive primary amine with two active hydrogens as well as a tertiary amine with catalytic activity. 

Amidoamine or polyamidoamine curing agents have reactivity with DGEBA epoxy resins that is similar to the polyamides. However, they are lower-viscosity products and are also lower in color. Amidoamines are derivatives of monobasic fatty carboxylic acids and aliphatic polyamines. Since the amidoamines have only one amide group per molecule, they are lower in molecular weight, viscosity, and amine functionality than the polyamides. 

The formulated adhesives are generally available as films or solvent solutions. They are commonly used as laminating adhesives for film or metallic foil because of their high peel strength. A composition consisting of a plasticized polyvinyl chloride copolymer and an epoxy resin can be cured with an aliphatic polyamine, which will crosslink by reacting with both resins. This adhesive possesses excellent adhesion to metals. 

Table 52 Activation Parameters for Reactions of some Aliphatic Polyamines of Rh111...

Table 53 Photochemical Behavior of some Aliphatic Polyamine Complexes of Rhm...

Ketone-blocked poly amines. These curing agents are complexes of primary aliphatic polyamines with ketone solvents (Figure 2.11). They are also called ketimines . When mixed with the DGEBA they provide long pot lives (up to 8 h) at room temperature. 

We have investigated the recovered glassfiber-resin powder for its properties as a filler for epoxy resin compounds which are used as paints or adhesives, and compared it to conventional fillers, such as talc and calcium carbonate. The epoxy resin compound, composed of bisphenol A type epoxy resin (50.0wt%), aliphatic polyamine type hardener (18.0wt%) and filler (32.0%), was prepared. Strength and thermal expansion properties were measured for the molded epoxy resin compound cured 23°C for 7 days. Viscosity was measured for the epoxy resin compound before adding the hardener. Adhesive strength was measured by tearing two ferric boards bonded with the epoxy resin compound which was composed of bisphenol A type epoxy resin (49.2wt%), polyaminoamide type hardener (18.0wt %), and filler (32.8wt%), and was cured at 23°C for 7 days. 

Van Alphen, J. On aliphatic polyamines. Rec. Trav. Chim. Pays-Bas SS,... 

Polyamine biosynthesis is associated with regulation of a number of metabolic functions including growth of cells in most of the living organisms. In mammals, ornithine is the precursor of aliphatic polyamines. Putrescine, formed by decarboxylation of the former by ornithine decarboxylase, is the first amine formed in polyamine biosynthesis. Putrescine gives rise to the other two polyamines, spermine and spermidine by successive addition of 3-aminopropyl residues derived from S-adenosyl-L-methionine (SAM) in the presence of different enzymes [44] (Chart 7). 

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