Polyimides containing nonaromatic nitrogen linkages was written by Feld, William A.;Le, Tieu Binh. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 1992.COA of Formula: C16H20N4 This article mentions the following:
Six polyimides were prepared by a 2-step polycondensation of 2,5-bis(4-aminophenyl)-2,5-diazahexane (I) and 1,4-bis(4-aminophenyl)-1,4-diazacyclohexane (II) with pyromellitic dianhydride (III), benzophenonetetracarboxylic dianhydride, and 5,5′-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]bis-1,3-isobenzofurandione. The effect of structure on the glass transition was studied by DSC, and DSC thermograms failed to indicate any distinct transitions <450°; however, I–III polyimide showed a slight break in its DSC curve at 233°. The m.p. of model compounds (prepared from phthalic anhydride) did not differ by as much as those of the free amines, 303-304 and 386° (DSC), resp. In the experiment, the researchers used many compounds, for example, 4,4′-(Piperazine-1,4-diyl)dianiline (cas: 7479-12-1COA of Formula: C16H20N4).
4,4′-(Piperazine-1,4-diyl)dianiline (cas: 7479-12-1) belongs to piperazine derivatives. A form in which piperazine is commonly available industrially is as the hexahydrate, C4H10N2. 6H2O, which melts at 44 °C and boils at 125–130 °C. Piperazine and its salts did not induce point mutations in a bacterial test. A series of mutagenicity studies in cells, both in vitro and in vivo, has been completed and showed no evidence of mutagenic effect.COA of Formula: C16H20N4
Referemce:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics