Diammonium sebacate

There are several processing steps involved to form DMDA from sebacic acid [10]. Firstly, sebacic acid is exposed and reacts with a nitrogen source such as gaseous ammonia to form diammonium sebacate. Upon continuous dehydration at elevated temperatures (200-220 °C) the dinitrile octamethylene dicyanide (C10H16N2) is formed which, after purification, is hydrogenated (80-100 °C, 2.5 MPa) in the presence of KOH and a nickel catalyst. Pure DMDA is subsequently obtained through vacuum distillation. 

The diammonium salts of the dicarb-oxylic acids from malonic to sebacic (25)... 

The most intensively studied disubstituted monomer, a,a-dimethyl-) -propiolactone (pivalo-lactone) (PVL), has been converted into several telechelics and used to prepare block copolymers.An interesting example of an assymetric telechelic from PVL was reported by Wilson and Beaman, in which cyclic tertiary amine initiators yielded telechelics having a-cycloammonium and o>-carboxylate end groups. Lenz et al prepared telechelics of a-methyl-a-butyl-jS-propiolactone (MBPL) with a diammonium dicarboxylate initiator (tetrabutylammonium sebacate), which were then used to polymerize PVL forming ABA triblock copolymers. ... 

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