Study On Synthesis And Properties Of Branched Molecules With Functional Terminal Groups

Four kinds of Polyamido-amines (PAMAM) were synthesized through divergent method. Series of dendritic bonding agents (DBA) with different number of hydroxyl groups at the periphery were also synthesized. The cross linking properties of different DBA/IPDI systems were checked by differential scanning calorimetric (DSC) analysis with non-isothermal measurement. The corresponding results were analyzed with Ozawa method. The values of activation energy (â–³E) and the pre-exponential factors (A) of various DBA/IPDI systems were found. The Ozawa constants, k₀ and n₀ were also obtained.A series of novel dendrimers (Fc-DBA) with hydroxyl and ferrocenyl terminal groups were synthesize. The curing behaviors of two kinds of Fc-DBA/IPDI systems were investigated by DSC with various heating rates. The burning rate promote abilities were checked through TGA measurement. The decomposition of ammonium perchiorate (AP) was accelerated by adding a little of those Fc-DBAs. The anti-migration performances of Fc-DBA in propellant were investigated.Three kinds of hyper-branched PAMAMs and two kinds of ferrocenyl-terminal hyper-branched PAMAMs were synthesized. The burning rate promotes ability of Fc-HPAMAMs were checked through TGA. The decomposition of ammonium perchiorate (AP) was accelerated by adding Fc-HPAMAM compounds. The anti-migration performances of Fc-HPAMAM in propellant were investigated.