With the widely used of polyallylamine in many areas,such as dyeing and finishing,water treatment,gas adsorption,the demand of polyallylamine is growing.However,there is a serious chain transfer reaction by directly polymerizing the monomer of allyl amine to get polyallylamine,so it is unable to get high molecular weight products.And also,the experiment is cumbersome by using hydrogenation methods to prepare polyallylamine.Therefore,it is necessary to develop new methods to prepare polyallylamine.Using allylamine hydrochloride as monomer,(NH4)2S2O8and NaHSO3as initiating systems,Poly(allylamine) was prepared through the free radical polymerization at 50 ℃.The structure of poly(allylamine) was characterized by1H-NMR and Fourier transform infrared (FTIR) spectrophotometer.The results of FTIR showed that the peaks at 997 cm-1(due to C=C bonds) and 945 cm-1(due to =C-H bonds) disappear after polymerization.The1H-NMR showed that there are three different hydrogen atoms on the prepared polyallylamine.The results of FTIR and1H-NMR indicated that the polyallylamine was successfully synthesized.The polymer reaction with hydrogen sulfide was studied and UV absorption spectrum indicated the wavelength of maximal absorption peak has redshift after reaction as well as the absorption intensity was increased.Energy Dispersive X-ray Detector (EDX) showed that there has sulfur at the surface of polymer after exposed to H2S with 1min.Besides,the result of EDX showed that there is 4.62 percent of sulfur atom on the surface of polymer after reacted with H2S.X-ray photoelectron spectroscopy (XPS) confirmed that there has chemical reaction and physical adsorption when the polymer exposed to H2S atmosphere.
