A novel bio-based AB2 monomer for preparing hyperbranched polyamides derived from levulinic acid and furfurylamine was written by Yang, Meng-Ling;Wu, Yue-Xiao;Liu, Yun;Qiu, Jin-Jun;Liu, Cheng-Mei. And the article was included in Polymer Chemistry in 2019.Electric Literature of C5H6ClN This article mentions the following:
A new AB2 type bio-based monomer (FDA-E) with two amino functional groups and one ester functional group was prepared from renewable levulinic acid and furfurylamine using a three-step reaction. The AB2 monomer underwent self-polycondensation under melt conditions to form a hyperbranched bio-polyamide. Polyamides show excellent solubility in a strong polar solvent and acidic solution In pure water, the rigid polyamides form a stable elastic gel by absorbing water instead of dissolving in it. Their glass transition temperatures are in the range 97-102°C and their char yields at 800°C are greater than 40%. The XRD results indicate that the three polyamides are amorphous polymers. In addition, the hyperbranched polyamides are fluorescent polymers and their photoluminescence properties depend on mol. weight, solvent, excitation wavelength, and excitation time. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Electric Literature of C5H6ClN).
Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Electric Literature of C5H6ClN