Optimization of amine-terminated polyacrylonitrile synthesis and characterization

摘要

Amine-terminated PANs were prepared in two steps. The first step includes free radical polymerization of acrylonitrile (AN) using initiator pair of ammonium persulfate and sodium thio-sulfate as redox system. In the second step, the amino groups were introduced through the reaction of polyacrylonitrile with excess of different diamines (10-fold) including ethylenediamine (EDA), hexamethylenediamine (HMDA) and octamethylenediamine (OMDA), to yield PAN-EDA, PAN-HMDA and PAN-OMDA, respectively. Optimization of the amine-terminated PANs synthesis was carried out at different temperatures (30-90 °C) and different time intervals (4-24 h). In addition, the introduction of the amino group was followed by the piperidine test and recording of the FT-IR spectra. All polymers were characterized by, ~1H NMR spectra, thermogravirnetric analysis (TGA), and FT-IR spectra.