邻苯二甲酸二元醇聚酯合成、表征与热解动力学

以钛酸四正丁酯为催化剂,2-乙基己醇为封端剂合成邻苯二甲酸聚1,2-丙二醇酯、邻苯二甲酸聚1,3-丁二醇酯和邻苯二甲酸聚1,4-丁二醇酯系列聚酯.经化学方法分析比较3种样品的酸值、羟值和皂化值.通过红外光谱仪、凝胶渗透色谱和热重分析仪-差示量热扫描仪等仪器分别分析比较了3种聚酯样品的分子结构、数均相对分子质量和分布以及热稳定性能,理论计算了热分解表观活化能.邻苯二甲酸聚1,2-丙二醇酯、邻苯二甲酸聚1,3-丁二醇酯和邻苯二甲酸聚1,4-丁二醇的分解焓分别为648.7 J/g、822.6 J/g和266.7 J/g,热分解表观活化能分别为77.36 kJ/mol、66.80 kJ/mol和71.22 kJ/mol.

Synthesizing, Analysis and Kinetics of Pyrolysis of the Phthalandione Polyester

The paper introduces the preparation of poly 1,2-propylene phthalate,poly 1,3-butylene phthalate and poly 1,4-butylene phthalate with tetra-n-butyl titanate as the catalyst and 2-ethyl-hexanol as the chain-termination reagent.The acid value,hydroxyl value and saponification value of the products were determined and compared by chemical analysis methods.Infrared Absorption Spectroscopy(IR),Gel Permeation Chromatography(GPC) and Thermo gravimetric Analyzer-Differential Thermal Analysis(TG-DTA) were used to detect and compare the structure,the number average molecular weight and the thermostability of the three products systematically.The activation energy of the thermal decomposition was computed.The decalescence enthalpy of poly 1,2-propylene phthalate,poly 1,3-butylene phthalate and poly 1,(4-)butylene phthalate are 648.7 J/g,822.6 J/g and 266.7 J/g.The activation energy of the thermal decomposition of them are 77.36 kJ/mol,66.80 kJ/mol and 71.22 kJ/mol,respectively.