端丙烯酸酯基环氧乙烷-四氢呋喃共聚醚的合成与表征

Synthesis and characterization of acrylate-terminated ethylene oxide-tetrahydrofuran copolyether

为了发展新型固化体系,以端羟基环氧乙烷-四氢呋喃共聚醚(PET)和丙烯酰氯为原料,三乙胺为催化剂,经过酰化反应制备出端丙烯酸酯基环氧乙烷-四氢呋喃共聚醚(APET)粘合剂,通过红外光谱、核磁共振氢谱、碳谱和凝胶渗透色谱对APET的结构进行了表征,采用锥板粘度计研究了其粘度,DSC测定了其玻璃化转变温度,考察了APET的固化行为及力学性能。结果表明,酰化反应后PET的端羟基吸收峰完全消失,出现了丙烯酸酯基团的特征峰,聚醚分子链未发生断裂,获得了目标化合物;APET的玻璃化转变温度为-67.6,20℃时粘度为11.55 Pa·s;APET不仅能与叠氮固化剂METGAP进行热固化,而且能与光引发剂TPO进行光固化,固化后的弹性体拉伸强度大于1.50 MPa,断裂伸长率大于110%,预期在3D打印复合推进剂中具有良好的应用前景。

To develop new curing system,using hydroxyl-terminated ethylene oxide-tetrahydrofuran copolyether and acryloyl chloride as raw materials,acrylate-teminated ethylene oxide-tetrahydrofuran copolyether(APET)was synthesized vis the acylation reaction.The product was characterized by IR,1H NMR,13 C NMR and GPC,the viscosity of APET was measured by cone-plate viscosimeter,the glass transition temperature of APET was measured by DSC and the curing behavior of APET was studied.Results show that the absorbance of hydroxyl-terminated group disappear and the characteristic peaks of acrylate group appear after acylation reaction,the molecular chain in copolyether is not breaked,the target compound is prepared.the glass transition temperature of APET is-67.6℃,the viscosity at 20℃is 11.55Pa·s.APET can be cured with METGAP by heating and with TPO by UV-irradiation,the mechanical properties of both cured elastomers are higher than 1.50MPa for tensile strength and 110%for elongation at break.APET shows promising applications in the fields of 3D printing composite propellant.