生物基戊二胺己二酸盐改性聚酯的合成及结构分析

Synthesis and Structure Analysis of Polyester Modified with Bio-based Diaminopentane Hexanedioic Salt

在聚酯反应过程中加入生物基戊二胺己二酸盐作为改性单体,成功制备出含生物基戊二胺己二酸的聚酰胺酯.采用核磁共振氢谱（1 H-NMR）、异核多重键相关谱（HMBC）、红外光谱（FTIR）以及元素分析对合成的聚酰胺酯结构进行表征.1 H-NMR结果表明,生物基戊二胺己二酸盐与精对苯二甲酸（PTA）的实际配比与投料比基本吻合,反应比较充分.HMBC结果表明,生物基戊二胺链段与PTA链段直接相连,说明加入的生物基戊二胺己二酸盐成功参与了反应.FTIR结果表明,红外光谱图上既有酯类特征峰,又有酰胺类特征峰,进一步说明产物为聚酰胺酯类物质.元素测试结果表明,两种系列聚酰胺酯的实际氮元素含量与理论氮元素含量的比值均为76%~90%,且都与生物基戊二胺己二酸盐的添加量正相关.

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 hf 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.