Triethylenetetra-amine

Preparation of Block Copolymers from Macroinitiators. In an early paper, Ceresa reported polymerization of methyl methacrylate in the presence of oxygen, and then swelling the polymer with styrene. On heating, the polymeric peroxide decomposed initiating styrene polymerization thus forming a block copolymer(89). Even earlier, macroperoxides, useful in the preparation of block copolymers, were prepared by initiating the polymerization of butadiene with m-diisopropyl benzene dihydroperoxide in an emulsion. On further heating in the presence of styrene and Fell salts, a block copolymer was formed l Recently in independent work, polypropylene hydroperoxide was prepared by ozonolysis, and with triethylenetetra-amine as an activator was used to initiate block addition of styrene(91) and other vinyl monomers(92,93). ... 

Amine-cured epoxy resins are extensively used as structural matrices in composite manufacture and as such the improvement of their mechanical properties is very desirable. As in the case of polystyrene the addition of a rubber phase provides an energy dissipation mechanism below and this increases the toughness of the overall material. Carboxy-terminated butadiene acrylonitrile (CTBN) is initially soluble in the reaction mixture of digylcidyl ether of bisphenol A (DGEBA) and the low-temperature cure system triethylenetetra-amine (TFTA) ... 

Ni(NHj), (H20) x(aq) complexes and for substitution of amine and aminocar-boxylate chelates for water molecules to form multidentate Ni(II) complexes (Table 3). Rates of water exchange increases by 10-10 for each increase in the number of nitrogens or carboxyl oxygens co-ordinated to the metal in the complex. Rates of water exchange in a Ni(II) complex co-ordinated to four nitrogens in the aliphatic amino-chelate triethylenetetra-amine (trien) is more rapid than around Ni(II) coordinated to two nitrogens in ethylenediamine [NH2 (CH2 >2 NH2, enj. This reactivity trend will be examined later in the context of NiO(s) dissolution. 

Ethylenediamine (en) [15] Among the impurities are water, carbon dioxide, ammonia and polyethylene amines (e.g. diethylenetriamine and triethylenetetra-mine). In the recommended purification method, commercial product (98%) is shaken for about 12h with activated molecular sieves (5A, 70 gl-1), the supernatant is decanted and shaken for about 12 h with a mixture of CaO (50 gl-1) and... 

---