Synthesis and Structure Analysis of Polyester Modified with Bio-based Diaminopentane Hexanedioic Salt
Bio-based diaminopentane hexanedioic salt was added as the modified monomer during the reaction of polyester,eventually,polyesteramides with bio-based diaminopentane hexanedioic salt were successfully prepared.The structure of polyesteramides was characterized by 1H-nuclear magnetic resonance (1H-NMR) and heteronuclear multiple-bond correlation (HMBC),Fourier transform infrared (FTIR) spectroscopy,and elemental analysis,respectively.Experimental results of 1H-NMR show that the actual molar ratio of diaminopentane hexanedioic salt to pure terephthalic acid (PTA) is basically consistent with the relative feed ratio.The results of HMBC indicate that the diaminopentane segment is connected with the PTA segment directly,that is to say,diaminopentane hexanedioic salt is involved in the reaction to form polyesteramides.The results of FTIR explain that the final reaction products are polyesteramides due to the ester characteristic peaks and the amide characteristic peaks are found in the infrared spectra.The results of elemental analysis show that the ratio of actual nitrogen contents to the oretical nitrogen contents of two series of polyesteramides is 76％-90％.Besides,the nitrogen contents have a positive correlation with the addition of diaminopentane hexanedioic salt.
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万方数据
维普
